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glib/glib/gdatetime.c
Philip Withnall 25a7c817d3 glib: Add missing (nullable) and (optional) annotations 
Add various (nullable) and (optional) annotations which were missing
from a variety of functions. Also port a couple of existing (allow-none)
annotations in the same files to use (nullable) and (optional) as
appropriate instead.

Secondly, add various (not nullable) annotations as needed by the new
default in gobject-introspection of marking gpointers as (nullable). See
https://bugzilla.gnome.org/show_bug.cgi?id=729660.

This includes adding some stub documentation comments for the
assertion macro error functions, which weren’t previously documented.
The new comments are purely to allow for annotations, and hence are
marked as (skip) to prevent the symbols appearing in the GIR file.

https://bugzilla.gnome.org/show_bug.cgi?id=719966
2015-11-07 10:48:32 +01:00

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/* gdatetime.c
*
* Copyright (C) 2009-2010 Christian Hergert <chris@dronelabs.com>
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
* Copyright (C) 2010 Emmanuele Bassi <ebassi@linux.intel.com>
* Copyright © 2010 Codethink Limited
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* licence, or (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA.
*
* Authors: Christian Hergert <chris@dronelabs.com>
* Thiago Santos <thiago.sousa.santos@collabora.co.uk>
* Emmanuele Bassi <ebassi@linux.intel.com>
* Ryan Lortie <desrt@desrt.ca>
*/
/* Algorithms within this file are based on the Calendar FAQ by
* Claus Tondering. It can be found at
* http://www.tondering.dk/claus/cal/calendar29.txt
*
* Copyright and disclaimer
* ------------------------
* This document is Copyright (C) 2008 by Claus Tondering.
* E-mail: claus@tondering.dk. (Please include the word
* "calendar" in the subject line.)
* The document may be freely distributed, provided this
* copyright notice is included and no money is charged for
* the document.
*
* This document is provided "as is". No warranties are made as
* to its correctness.
*/
/* Prologue {{{1 */
#include "config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_LANGINFO_TIME
#include <langinfo.h>
#endif
#include "gdatetime.h"
#include "gslice.h"
#include "gatomic.h"
#include "gcharset.h"
#include "gconvert.h"
#include "gfileutils.h"
#include "ghash.h"
#include "gmain.h"
#include "gmappedfile.h"
#include "gstrfuncs.h"
#include "gtestutils.h"
#include "gthread.h"
#include "gtimezone.h"
#include "glibintl.h"
#ifndef G_OS_WIN32
#include <sys/time.h>
#include <time.h>
#endif /* !G_OS_WIN32 */
/**
* SECTION:date-time
* @title: GDateTime
* @short_description: a structure representing Date and Time
* @see_also: #GTimeZone
*
* #GDateTime is a structure that combines a Gregorian date and time
* into a single structure. It provides many conversion and methods to
* manipulate dates and times. Time precision is provided down to
* microseconds and the time can range (proleptically) from 0001-01-01
* 00:00:00 to 9999-12-31 23:59:59.999999. #GDateTime follows POSIX
* time in the sense that it is oblivious to leap seconds.
*
* #GDateTime is an immutable object; once it has been created it cannot
* be modified further. All modifiers will create a new #GDateTime.
* Nearly all such functions can fail due to the date or time going out
* of range, in which case %NULL will be returned.
*
* #GDateTime is reference counted: the reference count is increased by calling
* g_date_time_ref() and decreased by calling g_date_time_unref(). When the
* reference count drops to 0, the resources allocated by the #GDateTime
* structure are released.
*
* Many parts of the API may produce non-obvious results. As an
* example, adding two months to January 31st will yield March 31st
* whereas adding one month and then one month again will yield either
* March 28th or March 29th. Also note that adding 24 hours is not
* always the same as adding one day (since days containing daylight
* savings time transitions are either 23 or 25 hours in length).
*
* #GDateTime is available since GLib 2.26.
*/
struct _GDateTime
{
/* Microsecond timekeeping within Day */
guint64 usec;
/* TimeZone information */
GTimeZone *tz;
gint interval;
/* 1 is 0001-01-01 in Proleptic Gregorian */
gint32 days;
volatile gint ref_count;
};
/* Time conversion {{{1 */
#define UNIX_EPOCH_START 719163
#define INSTANT_TO_UNIX(instant) \
((instant)/USEC_PER_SECOND - UNIX_EPOCH_START * SEC_PER_DAY)
#define UNIX_TO_INSTANT(unix) \
(((unix) + UNIX_EPOCH_START * SEC_PER_DAY) * USEC_PER_SECOND)
#define DAYS_IN_4YEARS 1461 /* days in 4 years */
#define DAYS_IN_100YEARS 36524 /* days in 100 years */
#define DAYS_IN_400YEARS 146097 /* days in 400 years */
#define USEC_PER_SECOND (G_GINT64_CONSTANT (1000000))
#define USEC_PER_MINUTE (G_GINT64_CONSTANT (60000000))
#define USEC_PER_HOUR (G_GINT64_CONSTANT (3600000000))
#define USEC_PER_MILLISECOND (G_GINT64_CONSTANT (1000))
#define USEC_PER_DAY (G_GINT64_CONSTANT (86400000000))
#define SEC_PER_DAY (G_GINT64_CONSTANT (86400))
#define SECS_PER_MINUTE (60)
#define SECS_PER_HOUR (60 * SECS_PER_MINUTE)
#define SECS_PER_DAY (24 * SECS_PER_HOUR)
#define SECS_PER_YEAR (365 * SECS_PER_DAY)
#define SECS_PER_JULIAN (DAYS_PER_PERIOD * SECS_PER_DAY)
#define GREGORIAN_LEAP(y) ((((y) % 4) == 0) && (!((((y) % 100) == 0) && (((y) % 400) != 0))))
#define JULIAN_YEAR(d) ((d)->julian / 365.25)
#define DAYS_PER_PERIOD (G_GINT64_CONSTANT (2914695))
static const guint16 days_in_months[2][13] =
{
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const guint16 days_in_year[2][13] =
{
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
#ifdef HAVE_LANGINFO_TIME
#define GET_AMPM(d) ((g_date_time_get_hour (d) < 12) ? \
nl_langinfo (AM_STR) : \
nl_langinfo (PM_STR))
#define PREFERRED_DATE_TIME_FMT nl_langinfo (D_T_FMT)
#define PREFERRED_DATE_FMT nl_langinfo (D_FMT)
#define PREFERRED_TIME_FMT nl_langinfo (T_FMT)
#define PREFERRED_TIME_FMT nl_langinfo (T_FMT)
#define PREFERRED_12HR_TIME_FMT nl_langinfo (T_FMT_AMPM)
static const gint weekday_item[2][7] =
{
{ ABDAY_2, ABDAY_3, ABDAY_4, ABDAY_5, ABDAY_6, ABDAY_7, ABDAY_1 },
{ DAY_2, DAY_3, DAY_4, DAY_5, DAY_6, DAY_7, DAY_1 }
};
static const gint month_item[2][12] =
{
{ ABMON_1, ABMON_2, ABMON_3, ABMON_4, ABMON_5, ABMON_6, ABMON_7, ABMON_8, ABMON_9, ABMON_10, ABMON_11, ABMON_12 },
{ MON_1, MON_2, MON_3, MON_4, MON_5, MON_6, MON_7, MON_8, MON_9, MON_10, MON_11, MON_12 },
};
#define WEEKDAY_ABBR(d) nl_langinfo (weekday_item[0][g_date_time_get_day_of_week (d) - 1])
#define WEEKDAY_FULL(d) nl_langinfo (weekday_item[1][g_date_time_get_day_of_week (d) - 1])
#define MONTH_ABBR(d) nl_langinfo (month_item[0][g_date_time_get_month (d) - 1])
#define MONTH_FULL(d) nl_langinfo (month_item[1][g_date_time_get_month (d) - 1])
#else
#define GET_AMPM(d) ((g_date_time_get_hour (d) < 12) \
/* Translators: 'before midday' indicator */ \
? C_("GDateTime", "AM") \
/* Translators: 'after midday' indicator */ \
: C_("GDateTime", "PM"))
/* Translators: this is the preferred format for expressing the date and the time */
#define PREFERRED_DATE_TIME_FMT C_("GDateTime", "%a %b %e %H:%M:%S %Y")
/* Translators: this is the preferred format for expressing the date */
#define PREFERRED_DATE_FMT C_("GDateTime", "%m/%d/%y")
/* Translators: this is the preferred format for expressing the time */
#define PREFERRED_TIME_FMT C_("GDateTime", "%H:%M:%S")
/* Translators: this is the preferred format for expressing 12 hour time */
#define PREFERRED_12HR_TIME_FMT C_("GDateTime", "%I:%M:%S %p")
#define WEEKDAY_ABBR(d) (get_weekday_name_abbr (g_date_time_get_day_of_week (d)))
#define WEEKDAY_FULL(d) (get_weekday_name (g_date_time_get_day_of_week (d)))
#define MONTH_ABBR(d) (get_month_name_abbr (g_date_time_get_month (d)))
#define MONTH_FULL(d) (get_month_name (g_date_time_get_month (d)))
static const gchar *
get_month_name (gint month)
{
switch (month)
{
case 1:
return C_("full month name", "January");
case 2:
return C_("full month name", "February");
case 3:
return C_("full month name", "March");
case 4:
return C_("full month name", "April");
case 5:
return C_("full month name", "May");
case 6:
return C_("full month name", "June");
case 7:
return C_("full month name", "July");
case 8:
return C_("full month name", "August");
case 9:
return C_("full month name", "September");
case 10:
return C_("full month name", "October");
case 11:
return C_("full month name", "November");
case 12:
return C_("full month name", "December");
default:
g_warning ("Invalid month number %d", month);
}
return NULL;
}
static const gchar *
get_month_name_abbr (gint month)
{
switch (month)
{
case 1:
return C_("abbreviated month name", "Jan");
case 2:
return C_("abbreviated month name", "Feb");
case 3:
return C_("abbreviated month name", "Mar");
case 4:
return C_("abbreviated month name", "Apr");
case 5:
return C_("abbreviated month name", "May");
case 6:
return C_("abbreviated month name", "Jun");
case 7:
return C_("abbreviated month name", "Jul");
case 8:
return C_("abbreviated month name", "Aug");
case 9:
return C_("abbreviated month name", "Sep");
case 10:
return C_("abbreviated month name", "Oct");
case 11:
return C_("abbreviated month name", "Nov");
case 12:
return C_("abbreviated month name", "Dec");
default:
g_warning ("Invalid month number %d", month);
}
return NULL;
}
static const gchar *
get_weekday_name (gint day)
{
switch (day)
{
case 1:
return C_("full weekday name", "Monday");
case 2:
return C_("full weekday name", "Tuesday");
case 3:
return C_("full weekday name", "Wednesday");
case 4:
return C_("full weekday name", "Thursday");
case 5:
return C_("full weekday name", "Friday");
case 6:
return C_("full weekday name", "Saturday");
case 7:
return C_("full weekday name", "Sunday");
default:
g_warning ("Invalid week day number %d", day);
}
return NULL;
}
static const gchar *
get_weekday_name_abbr (gint day)
{
switch (day)
{
case 1:
return C_("abbreviated weekday name", "Mon");
case 2:
return C_("abbreviated weekday name", "Tue");
case 3:
return C_("abbreviated weekday name", "Wed");
case 4:
return C_("abbreviated weekday name", "Thu");
case 5:
return C_("abbreviated weekday name", "Fri");
case 6:
return C_("abbreviated weekday name", "Sat");
case 7:
return C_("abbreviated weekday name", "Sun");
default:
g_warning ("Invalid week day number %d", day);
}
return NULL;
}
#endif /* HAVE_LANGINFO_TIME */
static inline gint
ymd_to_days (gint year,
gint month,
gint day)
{
gint64 days;
days = (year - 1) * 365 + ((year - 1) / 4) - ((year - 1) / 100)
+ ((year - 1) / 400);
days += days_in_year[0][month - 1];
if (GREGORIAN_LEAP (year) && month > 2)
day++;
days += day;
return days;
}
static void
g_date_time_get_week_number (GDateTime *datetime,
gint *week_number,
gint *day_of_week,
gint *day_of_year)
{
gint a, b, c, d, e, f, g, n, s, month, day, year;
g_date_time_get_ymd (datetime, &year, &month, &day);
if (month <= 2)
{
a = g_date_time_get_year (datetime) - 1;
b = (a / 4) - (a / 100) + (a / 400);
c = ((a - 1) / 4) - ((a - 1) / 100) + ((a - 1) / 400);
s = b - c;
e = 0;
f = day - 1 + (31 * (month - 1));
}
else
{
a = year;
b = (a / 4) - (a / 100) + (a / 400);
c = ((a - 1) / 4) - ((a - 1) / 100) + ((a - 1) / 400);
s = b - c;
e = s + 1;
f = day + (((153 * (month - 3)) + 2) / 5) + 58 + s;
}
g = (a + b) % 7;
d = (f + g - e) % 7;
n = f + 3 - d;
if (week_number)
{
if (n < 0)
*week_number = 53 - ((g - s) / 5);
else if (n > 364 + s)
*week_number = 1;
else
*week_number = (n / 7) + 1;
}
if (day_of_week)
*day_of_week = d + 1;
if (day_of_year)
*day_of_year = f + 1;
}
/* Lifecycle {{{1 */
static GDateTime *
g_date_time_alloc (GTimeZone *tz)
{
GDateTime *datetime;
datetime = g_slice_new0 (GDateTime);
datetime->tz = g_time_zone_ref (tz);
datetime->ref_count = 1;
return datetime;
}
/**
* g_date_time_ref:
* @datetime: a #GDateTime
*
* Atomically increments the reference count of @datetime by one.
*
* Returns: the #GDateTime with the reference count increased
*
* Since: 2.26
*/
GDateTime *
g_date_time_ref (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, NULL);
g_return_val_if_fail (datetime->ref_count > 0, NULL);
g_atomic_int_inc (&datetime->ref_count);
return datetime;
}
/**
* g_date_time_unref:
* @datetime: a #GDateTime
*
* Atomically decrements the reference count of @datetime by one.
*
* When the reference count reaches zero, the resources allocated by
* @datetime are freed
*
* Since: 2.26
*/
void
g_date_time_unref (GDateTime *datetime)
{
g_return_if_fail (datetime != NULL);
g_return_if_fail (datetime->ref_count > 0);
if (g_atomic_int_dec_and_test (&datetime->ref_count))
{
g_time_zone_unref (datetime->tz);
g_slice_free (GDateTime, datetime);
}
}
/* Internal state transformers {{{1 */
/*< internal >
* g_date_time_to_instant:
* @datetime: a #GDateTime
*
* Convert a @datetime into an instant.
*
* An instant is a number that uniquely describes a particular
* microsecond in time, taking time zone considerations into account.
* (ie: "03:00 -0400" is the same instant as "02:00 -0500").
*
* An instant is always positive but we use a signed return value to
* avoid troubles with C.
*/
static gint64
g_date_time_to_instant (GDateTime *datetime)
{
gint64 offset;
offset = g_time_zone_get_offset (datetime->tz, datetime->interval);
offset *= USEC_PER_SECOND;
return datetime->days * USEC_PER_DAY + datetime->usec - offset;
}
/*< internal >
* g_date_time_from_instant:
* @tz: a #GTimeZone
* @instant: a instant in time
*
* Creates a #GDateTime from a time zone and an instant.
*
* This might fail if the time ends up being out of range.
*/
static GDateTime *
g_date_time_from_instant (GTimeZone *tz,
gint64 instant)
{
GDateTime *datetime;
gint64 offset;
if (instant < 0 || instant > G_GINT64_CONSTANT (1000000000000000000))
return NULL;
datetime = g_date_time_alloc (tz);
datetime->interval = g_time_zone_find_interval (tz,
G_TIME_TYPE_UNIVERSAL,
INSTANT_TO_UNIX (instant));
offset = g_time_zone_get_offset (datetime->tz, datetime->interval);
offset *= USEC_PER_SECOND;
instant += offset;
datetime->days = instant / USEC_PER_DAY;
datetime->usec = instant % USEC_PER_DAY;
if (datetime->days < 1 || 3652059 < datetime->days)
{
g_date_time_unref (datetime);
datetime = NULL;
}
return datetime;
}
/*< internal >
* g_date_time_deal_with_date_change:
* @datetime: a #GDateTime
*
* This function should be called whenever the date changes by adding
* days, months or years. It does three things.
*
* First, we ensure that the date falls between 0001-01-01 and
* 9999-12-31 and return %FALSE if it does not.
*
* Next we update the ->interval field.
*
* Finally, we ensure that the resulting date and time pair exists (by
* ensuring that our time zone has an interval containing it) and
* adjusting as required. For example, if we have the time 02:30:00 on
* March 13 2010 in Toronto and we add 1 day to it, we would end up with
* 2:30am on March 14th, which doesn't exist. In that case, we bump the
* time up to 3:00am.
*/
static gboolean
g_date_time_deal_with_date_change (GDateTime *datetime)
{
GTimeType was_dst;
gint64 full_time;
gint64 usec;
if (datetime->days < 1 || datetime->days > 3652059)
return FALSE;
was_dst = g_time_zone_is_dst (datetime->tz, datetime->interval);
full_time = datetime->days * USEC_PER_DAY + datetime->usec;
usec = full_time % USEC_PER_SECOND;
full_time /= USEC_PER_SECOND;
full_time -= UNIX_EPOCH_START * SEC_PER_DAY;
datetime->interval = g_time_zone_adjust_time (datetime->tz,
was_dst,
&full_time);
full_time += UNIX_EPOCH_START * SEC_PER_DAY;
full_time *= USEC_PER_SECOND;
full_time += usec;
datetime->days = full_time / USEC_PER_DAY;
datetime->usec = full_time % USEC_PER_DAY;
/* maybe daylight time caused us to shift to a different day,
* but it definitely didn't push us into a different year */
return TRUE;
}
static GDateTime *
g_date_time_replace_days (GDateTime *datetime,
gint days)
{
GDateTime *new;
new = g_date_time_alloc (datetime->tz);
new->interval = datetime->interval;
new->usec = datetime->usec;
new->days = days;
if (!g_date_time_deal_with_date_change (new))
{
g_date_time_unref (new);
new = NULL;
}
return new;
}
/* now/unix/timeval Constructors {{{1 */
/*< internal >
* g_date_time_new_from_timeval:
* @tz: a #GTimeZone
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in the
* given time zone @tz.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the
* given time zone.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
static GDateTime *
g_date_time_new_from_timeval (GTimeZone *tz,
const GTimeVal *tv)
{
return g_date_time_from_instant (tz, tv->tv_usec +
UNIX_TO_INSTANT (tv->tv_sec));
}
/*< internal >
* g_date_time_new_from_unix:
* @tz: a #GTimeZone
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in the
* given time zone @tz.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC, regardless of the time zone given.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
static GDateTime *
g_date_time_new_from_unix (GTimeZone *tz,
gint64 secs)
{
return g_date_time_from_instant (tz, UNIX_TO_INSTANT (secs));
}
/**
* g_date_time_new_now:
* @tz: a #GTimeZone
*
* Creates a #GDateTime corresponding to this exact instant in the given
* time zone @tz. The time is as accurate as the system allows, to a
* maximum accuracy of 1 microsecond.
*
* This function will always succeed unless the system clock is set to
* truly insane values (or unless GLib is still being used after the
* year 9999).
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now (GTimeZone *tz)
{
GTimeVal tv;
g_get_current_time (&tv);
return g_date_time_new_from_timeval (tz, &tv);
}
/**
* g_date_time_new_now_local:
*
* Creates a #GDateTime corresponding to this exact instant in the local
* time zone.
*
* This is equivalent to calling g_date_time_new_now() with the time
* zone returned by g_time_zone_new_local().
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now_local (void)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_now (local);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_now_utc:
*
* Creates a #GDateTime corresponding to this exact instant in UTC.
*
* This is equivalent to calling g_date_time_new_now() with the time
* zone returned by g_time_zone_new_utc().
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_now_utc (void)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_now (utc);
g_time_zone_unref (utc);
return datetime;
}
/**
* g_date_time_new_from_unix_local:
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in the
* local time zone.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC, regardless of the local time offset.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_unix_local (gint64 t)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_from_unix (local, t);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_from_unix_utc:
* @t: the Unix time
*
* Creates a #GDateTime corresponding to the given Unix time @t in UTC.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC.
*
* This call can fail (returning %NULL) if @t represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_unix_utc (gint64 t)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_from_unix (utc, t);
g_time_zone_unref (utc);
return datetime;
}
/**
* g_date_time_new_from_timeval_local:
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in the
* local time zone.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the
* local time offset.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_timeval_local (const GTimeVal *tv)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new_from_timeval (local, tv);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_from_timeval_utc:
* @tv: a #GTimeVal
*
* Creates a #GDateTime corresponding to the given #GTimeVal @tv in UTC.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC.
*
* This call can fail (returning %NULL) if @tv represents a time outside
* of the supported range of #GDateTime.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_from_timeval_utc (const GTimeVal *tv)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new_from_timeval (utc, tv);
g_time_zone_unref (utc);
return datetime;
}
/* full new functions {{{1 */
/**
* g_date_time_new:
* @tz: a #GTimeZone
* @year: the year component of the date
* @month: the month component of the date
* @day: the day component of the date
* @hour: the hour component of the date
* @minute: the minute component of the date
* @seconds: the number of seconds past the minute
*
* Creates a new #GDateTime corresponding to the given date and time in
* the time zone @tz.
*
* The @year must be between 1 and 9999, @month between 1 and 12 and @day
* between 1 and 28, 29, 30 or 31 depending on the month and the year.
*
* @hour must be between 0 and 23 and @minute must be between 0 and 59.
*
* @seconds must be at least 0.0 and must be strictly less than 60.0.
* It will be rounded down to the nearest microsecond.
*
* If the given time is not representable in the given time zone (for
* example, 02:30 on March 14th 2010 in Toronto, due to daylight savings
* time) then the time will be rounded up to the nearest existing time
* (in this case, 03:00). If this matters to you then you should verify
* the return value for containing the same as the numbers you gave.
*
* In the case that the given time is ambiguous in the given time zone
* (for example, 01:30 on November 7th 2010 in Toronto, due to daylight
* savings time) then the time falling within standard (ie:
* non-daylight) time is taken.
*
* It not considered a programmer error for the values to this function
* to be out of range, but in the case that they are, the function will
* return %NULL.
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new (GTimeZone *tz,
gint year,
gint month,
gint day,
gint hour,
gint minute,
gdouble seconds)
{
GDateTime *datetime;
gint64 full_time;
g_return_val_if_fail (tz != NULL, NULL);
if (year < 1 || year > 9999 ||
month < 1 || month > 12 ||
day < 1 || day > 31 ||
hour < 0 || hour > 23 ||
minute < 0 || minute > 59 ||
seconds < 0.0 || seconds >= 60.0)
return NULL;
datetime = g_date_time_alloc (tz);
datetime->days = ymd_to_days (year, month, day);
datetime->usec = (hour * USEC_PER_HOUR)
+ (minute * USEC_PER_MINUTE)
+ (gint64) (seconds * USEC_PER_SECOND);
full_time = SEC_PER_DAY *
(ymd_to_days (year, month, day) - UNIX_EPOCH_START) +
SECS_PER_HOUR * hour +
SECS_PER_MINUTE * minute +
(int) seconds;
datetime->interval = g_time_zone_adjust_time (datetime->tz,
G_TIME_TYPE_STANDARD,
&full_time);
full_time += UNIX_EPOCH_START * SEC_PER_DAY;
datetime->days = full_time / SEC_PER_DAY;
datetime->usec = (full_time % SEC_PER_DAY) * USEC_PER_SECOND;
datetime->usec += ((int) (seconds * USEC_PER_SECOND)) % USEC_PER_SECOND;
return datetime;
}
/**
* g_date_time_new_local:
* @year: the year component of the date
* @month: the month component of the date
* @day: the day component of the date
* @hour: the hour component of the date
* @minute: the minute component of the date
* @seconds: the number of seconds past the minute
*
* Creates a new #GDateTime corresponding to the given date and time in
* the local time zone.
*
* This call is equivalent to calling g_date_time_new() with the time
* zone returned by g_time_zone_new_local().
*
* Returns: a #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_local (gint year,
gint month,
gint day,
gint hour,
gint minute,
gdouble seconds)
{
GDateTime *datetime;
GTimeZone *local;
local = g_time_zone_new_local ();
datetime = g_date_time_new (local, year, month, day, hour, minute, seconds);
g_time_zone_unref (local);
return datetime;
}
/**
* g_date_time_new_utc:
* @year: the year component of the date
* @month: the month component of the date
* @day: the day component of the date
* @hour: the hour component of the date
* @minute: the minute component of the date
* @seconds: the number of seconds past the minute
*
* Creates a new #GDateTime corresponding to the given date and time in
* UTC.
*
* This call is equivalent to calling g_date_time_new() with the time
* zone returned by g_time_zone_new_utc().
*
* Returns: a #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_new_utc (gint year,
gint month,
gint day,
gint hour,
gint minute,
gdouble seconds)
{
GDateTime *datetime;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
datetime = g_date_time_new (utc, year, month, day, hour, minute, seconds);
g_time_zone_unref (utc);
return datetime;
}
/* Adders {{{1 */
/**
* g_date_time_add:
* @datetime: a #GDateTime
* @timespan: a #GTimeSpan
*
* Creates a copy of @datetime and adds the specified timespan to the copy.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add (GDateTime *datetime,
GTimeSpan timespan)
{
return g_date_time_from_instant (datetime->tz, timespan +
g_date_time_to_instant (datetime));
}
/**
* g_date_time_add_years:
* @datetime: a #GDateTime
* @years: the number of years
*
* Creates a copy of @datetime and adds the specified number of years to the
* copy. Add negative values to subtract years.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime *
g_date_time_add_years (GDateTime *datetime,
gint years)
{
gint year, month, day;
g_return_val_if_fail (datetime != NULL, NULL);
if (years < -10000 || years > 10000)
return NULL;
g_date_time_get_ymd (datetime, &year, &month, &day);
year += years;
/* only possible issue is if we've entered a year with no February 29
*/
if (month == 2 && day == 29 && !GREGORIAN_LEAP (year))
day = 28;
return g_date_time_replace_days (datetime, ymd_to_days (year, month, day));
}
/**
* g_date_time_add_months:
* @datetime: a #GDateTime
* @months: the number of months
*
* Creates a copy of @datetime and adds the specified number of months to the
* copy. Add negative values to subtract months.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_months (GDateTime *datetime,
gint months)
{
gint year, month, day;
g_return_val_if_fail (datetime != NULL, NULL);
g_date_time_get_ymd (datetime, &year, &month, &day);
if (months < -120000 || months > 120000)
return NULL;
year += months / 12;
month += months % 12;
if (month < 1)
{
month += 12;
year--;
}
else if (month > 12)
{
month -= 12;
year++;
}
day = MIN (day, days_in_months[GREGORIAN_LEAP (year)][month]);
return g_date_time_replace_days (datetime, ymd_to_days (year, month, day));
}
/**
* g_date_time_add_weeks:
* @datetime: a #GDateTime
* @weeks: the number of weeks
*
* Creates a copy of @datetime and adds the specified number of weeks to the
* copy. Add negative values to subtract weeks.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_weeks (GDateTime *datetime,
gint weeks)
{
g_return_val_if_fail (datetime != NULL, NULL);
return g_date_time_add_days (datetime, weeks * 7);
}
/**
* g_date_time_add_days:
* @datetime: a #GDateTime
* @days: the number of days
*
* Creates a copy of @datetime and adds the specified number of days to the
* copy. Add negative values to subtract days.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_days (GDateTime *datetime,
gint days)
{
g_return_val_if_fail (datetime != NULL, NULL);
if (days < -3660000 || days > 3660000)
return NULL;
return g_date_time_replace_days (datetime, datetime->days + days);
}
/**
* g_date_time_add_hours:
* @datetime: a #GDateTime
* @hours: the number of hours to add
*
* Creates a copy of @datetime and adds the specified number of hours.
* Add negative values to subtract hours.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_hours (GDateTime *datetime,
gint hours)
{
return g_date_time_add (datetime, hours * USEC_PER_HOUR);
}
/**
* g_date_time_add_minutes:
* @datetime: a #GDateTime
* @minutes: the number of minutes to add
*
* Creates a copy of @datetime adding the specified number of minutes.
* Add negative values to subtract minutes.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_minutes (GDateTime *datetime,
gint minutes)
{
return g_date_time_add (datetime, minutes * USEC_PER_MINUTE);
}
/**
* g_date_time_add_seconds:
* @datetime: a #GDateTime
* @seconds: the number of seconds to add
*
* Creates a copy of @datetime and adds the specified number of seconds.
* Add negative values to subtract seconds.
*
* Returns: the newly created #GDateTime which should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime*
g_date_time_add_seconds (GDateTime *datetime,
gdouble seconds)
{
return g_date_time_add (datetime, seconds * USEC_PER_SECOND);
}
/**
* g_date_time_add_full:
* @datetime: a #GDateTime
* @years: the number of years to add
* @months: the number of months to add
* @days: the number of days to add
* @hours: the number of hours to add
* @minutes: the number of minutes to add
* @seconds: the number of seconds to add
*
* Creates a new #GDateTime adding the specified values to the current date and
* time in @datetime. Add negative values to subtract.
*
* Returns: the newly created #GDateTime that should be freed with
* g_date_time_unref().
*
* Since: 2.26
*/
GDateTime *
g_date_time_add_full (GDateTime *datetime,
gint years,
gint months,
gint days,
gint hours,
gint minutes,
gdouble seconds)
{
gint year, month, day;
gint64 full_time;
GDateTime *new;
gint interval;
g_return_val_if_fail (datetime != NULL, NULL);
g_date_time_get_ymd (datetime, &year, &month, &day);
months += years * 12;
if (months < -120000 || months > 120000)
return NULL;
if (days < -3660000 || days > 3660000)
return NULL;
year += months / 12;
month += months % 12;
if (month < 1)
{
month += 12;
year--;
}
else if (month > 12)
{
month -= 12;
year++;
}
day = MIN (day, days_in_months[GREGORIAN_LEAP (year)][month]);
/* full_time is now in unix (local) time */
full_time = datetime->usec / USEC_PER_SECOND + SEC_PER_DAY *
(ymd_to_days (year, month, day) + days - UNIX_EPOCH_START);
interval = g_time_zone_adjust_time (datetime->tz,
g_time_zone_is_dst (datetime->tz,
datetime->interval),
&full_time);
/* move to UTC unix time */
full_time -= g_time_zone_get_offset (datetime->tz, interval);
/* convert back to an instant, add back fractional seconds */
full_time += UNIX_EPOCH_START * SEC_PER_DAY;
full_time = full_time * USEC_PER_SECOND +
datetime->usec % USEC_PER_SECOND;
/* do the actual addition now */
full_time += (hours * USEC_PER_HOUR) +
(minutes * USEC_PER_MINUTE) +
(gint64) (seconds * USEC_PER_SECOND);
/* find the new interval */
interval = g_time_zone_find_interval (datetime->tz,
G_TIME_TYPE_UNIVERSAL,
INSTANT_TO_UNIX (full_time));
/* convert back into local time */
full_time += USEC_PER_SECOND *
g_time_zone_get_offset (datetime->tz, interval);
/* split into days and usec of a new datetime */
new = g_date_time_alloc (datetime->tz);
new->interval = interval;
new->days = full_time / USEC_PER_DAY;
new->usec = full_time % USEC_PER_DAY;
/* XXX validate */
return new;
}
/* Compare, difference, hash, equal {{{1 */
/**
* g_date_time_compare:
* @dt1: (not nullable): first #GDateTime to compare
* @dt2: (not nullable): second #GDateTime to compare
*
* A comparison function for #GDateTimes that is suitable
* as a #GCompareFunc. Both #GDateTimes must be non-%NULL.
*
* Returns: -1, 0 or 1 if @dt1 is less than, equal to or greater
* than @dt2.
*
* Since: 2.26
*/
gint
g_date_time_compare (gconstpointer dt1,
gconstpointer dt2)
{
gint64 difference;
difference = g_date_time_difference ((GDateTime *) dt1, (GDateTime *) dt2);
if (difference < 0)
return -1;
else if (difference > 0)
return 1;
else
return 0;
}
/**
* g_date_time_difference:
* @end: a #GDateTime
* @begin: a #GDateTime
*
* Calculates the difference in time between @end and @begin. The
* #GTimeSpan that is returned is effectively @end - @begin (ie:
* positive if the first parameter is larger).
*
* Returns: the difference between the two #GDateTime, as a time
* span expressed in microseconds.
*
* Since: 2.26
*/
GTimeSpan
g_date_time_difference (GDateTime *end,
GDateTime *begin)
{
g_return_val_if_fail (begin != NULL, 0);
g_return_val_if_fail (end != NULL, 0);
return g_date_time_to_instant (end) -
g_date_time_to_instant (begin);
}
/**
* g_date_time_hash:
* @datetime: (not nullable): a #GDateTime
*
* Hashes @datetime into a #guint, suitable for use within #GHashTable.
*
* Returns: a #guint containing the hash
*
* Since: 2.26
*/
guint
g_date_time_hash (gconstpointer datetime)
{
return g_date_time_to_instant ((GDateTime *) datetime);
}
/**
* g_date_time_equal:
* @dt1: (not nullable): a #GDateTime
* @dt2: (not nullable): a #GDateTime
*
* Checks to see if @dt1 and @dt2 are equal.
*
* Equal here means that they represent the same moment after converting
* them to the same time zone.
*
* Returns: %TRUE if @dt1 and @dt2 are equal
*
* Since: 2.26
*/
gboolean
g_date_time_equal (gconstpointer dt1,
gconstpointer dt2)
{
return g_date_time_difference ((GDateTime *) dt1, (GDateTime *) dt2) == 0;
}
/* Year, Month, Day Getters {{{1 */
/**
* g_date_time_get_ymd:
* @datetime: a #GDateTime.
* @year: (out) (allow-none): the return location for the gregorian year, or %NULL.
* @month: (out) (allow-none): the return location for the month of the year, or %NULL.
* @day: (out) (allow-none): the return location for the day of the month, or %NULL.
*
* Retrieves the Gregorian day, month, and year of a given #GDateTime.
*
* Since: 2.26
**/
void
g_date_time_get_ymd (GDateTime *datetime,
gint *year,
gint *month,
gint *day)
{
gint the_year;
gint the_month;
gint the_day;
gint remaining_days;
gint y100_cycles;
gint y4_cycles;
gint y1_cycles;
gint preceding;
gboolean leap;
g_return_if_fail (datetime != NULL);
remaining_days = datetime->days;
/*
* We need to convert an offset in days to its year/month/day representation.
* Leap years makes this a little trickier than it should be, so we use
* 400, 100 and 4 years cycles here to get to the correct year.
*/
/* Our days offset starts sets 0001-01-01 as day 1, if it was day 0 our
* math would be simpler, so let's do it */
remaining_days--;
the_year = (remaining_days / DAYS_IN_400YEARS) * 400 + 1;
remaining_days = remaining_days % DAYS_IN_400YEARS;
y100_cycles = remaining_days / DAYS_IN_100YEARS;
remaining_days = remaining_days % DAYS_IN_100YEARS;
the_year += y100_cycles * 100;
y4_cycles = remaining_days / DAYS_IN_4YEARS;
remaining_days = remaining_days % DAYS_IN_4YEARS;
the_year += y4_cycles * 4;
y1_cycles = remaining_days / 365;
the_year += y1_cycles;
remaining_days = remaining_days % 365;
if (y1_cycles == 4 || y100_cycles == 4) {
g_assert (remaining_days == 0);
/* special case that indicates that the date is actually one year before,
* in the 31th of December */
the_year--;
the_month = 12;
the_day = 31;
goto end;
}
/* now get the month and the day */
leap = y1_cycles == 3 && (y4_cycles != 24 || y100_cycles == 3);
g_assert (leap == GREGORIAN_LEAP(the_year));
the_month = (remaining_days + 50) >> 5;
preceding = (days_in_year[0][the_month - 1] + (the_month > 2 && leap));
if (preceding > remaining_days)
{
/* estimate is too large */
the_month -= 1;
preceding -= leap ? days_in_months[1][the_month]
: days_in_months[0][the_month];
}
remaining_days -= preceding;
g_assert(0 <= remaining_days);
the_day = remaining_days + 1;
end:
if (year)
*year = the_year;
if (month)
*month = the_month;
if (day)
*day = the_day;
}
/**
* g_date_time_get_year:
* @datetime: A #GDateTime
*
* Retrieves the year represented by @datetime in the Gregorian calendar.
*
* Returns: the year represented by @datetime
*
* Since: 2.26
*/
gint
g_date_time_get_year (GDateTime *datetime)
{
gint year;
g_return_val_if_fail (datetime != NULL, 0);
g_date_time_get_ymd (datetime, &year, NULL, NULL);
return year;
}
/**
* g_date_time_get_month:
* @datetime: a #GDateTime
*
* Retrieves the month of the year represented by @datetime in the Gregorian
* calendar.
*
* Returns: the month represented by @datetime
*
* Since: 2.26
*/
gint
g_date_time_get_month (GDateTime *datetime)
{
gint month;
g_return_val_if_fail (datetime != NULL, 0);
g_date_time_get_ymd (datetime, NULL, &month, NULL);
return month;
}
/**
* g_date_time_get_day_of_month:
* @datetime: a #GDateTime
*
* Retrieves the day of the month represented by @datetime in the gregorian
* calendar.
*
* Returns: the day of the month
*
* Since: 2.26
*/
gint
g_date_time_get_day_of_month (GDateTime *datetime)
{
gint day_of_year,
i;
const guint16 *days;
guint16 last = 0;
g_return_val_if_fail (datetime != NULL, 0);
days = days_in_year[GREGORIAN_LEAP (g_date_time_get_year (datetime)) ? 1 : 0];
g_date_time_get_week_number (datetime, NULL, NULL, &day_of_year);
for (i = 1; i <= 12; i++)
{
if (days [i] >= day_of_year)
return day_of_year - last;
last = days [i];
}
g_warn_if_reached ();
return 0;
}
/* Week of year / day of week getters {{{1 */
/**
* g_date_time_get_week_numbering_year:
* @datetime: a #GDateTime
*
* Returns the ISO 8601 week-numbering year in which the week containing
* @datetime falls.
*
* This function, taken together with g_date_time_get_week_of_year() and
* g_date_time_get_day_of_week() can be used to determine the full ISO
* week date on which @datetime falls.
*
* This is usually equal to the normal Gregorian year (as returned by
* g_date_time_get_year()), except as detailed below:
*
* For Thursday, the week-numbering year is always equal to the usual
* calendar year. For other days, the number is such that every day
* within a complete week (Monday to Sunday) is contained within the
* same week-numbering year.
*
* For Monday, Tuesday and Wednesday occurring near the end of the year,
* this may mean that the week-numbering year is one greater than the
* calendar year (so that these days have the same week-numbering year
* as the Thursday occurring early in the next year).
*
* For Friday, Saturday and Sunday occurring near the start of the year,
* this may mean that the week-numbering year is one less than the
* calendar year (so that these days have the same week-numbering year
* as the Thursday occurring late in the previous year).
*
* An equivalent description is that the week-numbering year is equal to
* the calendar year containing the majority of the days in the current
* week (Monday to Sunday).
*
* Note that January 1 0001 in the proleptic Gregorian calendar is a
* Monday, so this function never returns 0.
*
* Returns: the ISO 8601 week-numbering year for @datetime
*
* Since: 2.26
**/
gint
g_date_time_get_week_numbering_year (GDateTime *datetime)
{
gint year, month, day, weekday;
g_date_time_get_ymd (datetime, &year, &month, &day);
weekday = g_date_time_get_day_of_week (datetime);
/* January 1, 2, 3 might be in the previous year if they occur after
* Thursday.
*
* Jan 1: Friday, Saturday, Sunday => day 1: weekday 5, 6, 7
* Jan 2: Saturday, Sunday => day 2: weekday 6, 7
* Jan 3: Sunday => day 3: weekday 7
*
* So we have a special case if (day - weekday) <= -4
*/
if (month == 1 && (day - weekday) <= -4)
return year - 1;
/* December 29, 30, 31 might be in the next year if they occur before
* Thursday.
*
* Dec 31: Monday, Tuesday, Wednesday => day 31: weekday 1, 2, 3
* Dec 30: Monday, Tuesday => day 30: weekday 1, 2
* Dec 29: Monday => day 29: weekday 1
*
* So we have a special case if (day - weekday) >= 28
*/
else if (month == 12 && (day - weekday) >= 28)
return year + 1;
else
return year;
}
/**
* g_date_time_get_week_of_year:
* @datetime: a #GDateTime
*
* Returns the ISO 8601 week number for the week containing @datetime.
* The ISO 8601 week number is the same for every day of the week (from
* Moday through Sunday). That can produce some unusual results
* (described below).
*
* The first week of the year is week 1. This is the week that contains
* the first Thursday of the year. Equivalently, this is the first week
* that has more than 4 of its days falling within the calendar year.
*
* The value 0 is never returned by this function. Days contained
* within a year but occurring before the first ISO 8601 week of that
* year are considered as being contained in the last week of the
* previous year. Similarly, the final days of a calendar year may be
* considered as being part of the first ISO 8601 week of the next year
* if 4 or more days of that week are contained within the new year.
*
* Returns: the ISO 8601 week number for @datetime.
*
* Since: 2.26
*/
gint
g_date_time_get_week_of_year (GDateTime *datetime)
{
gint weeknum;
g_return_val_if_fail (datetime != NULL, 0);
g_date_time_get_week_number (datetime, &weeknum, NULL, NULL);
return weeknum;
}
/**
* g_date_time_get_day_of_week:
* @datetime: a #GDateTime
*
* Retrieves the ISO 8601 day of the week on which @datetime falls (1 is
* Monday, 2 is Tuesday... 7 is Sunday).
*
* Returns: the day of the week
*
* Since: 2.26
*/
gint
g_date_time_get_day_of_week (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->days - 1) % 7 + 1;
}
/* Day of year getter {{{1 */
/**
* g_date_time_get_day_of_year:
* @datetime: a #GDateTime
*
* Retrieves the day of the year represented by @datetime in the Gregorian
* calendar.
*
* Returns: the day of the year
*
* Since: 2.26
*/
gint
g_date_time_get_day_of_year (GDateTime *datetime)
{
gint doy = 0;
g_return_val_if_fail (datetime != NULL, 0);
g_date_time_get_week_number (datetime, NULL, NULL, &doy);
return doy;
}
/* Time component getters {{{1 */
/**
* g_date_time_get_hour:
* @datetime: a #GDateTime
*
* Retrieves the hour of the day represented by @datetime
*
* Returns: the hour of the day
*
* Since: 2.26
*/
gint
g_date_time_get_hour (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->usec / USEC_PER_HOUR);
}
/**
* g_date_time_get_minute:
* @datetime: a #GDateTime
*
* Retrieves the minute of the hour represented by @datetime
*
* Returns: the minute of the hour
*
* Since: 2.26
*/
gint
g_date_time_get_minute (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->usec % USEC_PER_HOUR) / USEC_PER_MINUTE;
}
/**
* g_date_time_get_second:
* @datetime: a #GDateTime
*
* Retrieves the second of the minute represented by @datetime
*
* Returns: the second represented by @datetime
*
* Since: 2.26
*/
gint
g_date_time_get_second (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->usec % USEC_PER_MINUTE) / USEC_PER_SECOND;
}
/**
* g_date_time_get_microsecond:
* @datetime: a #GDateTime
*
* Retrieves the microsecond of the date represented by @datetime
*
* Returns: the microsecond of the second
*
* Since: 2.26
*/
gint
g_date_time_get_microsecond (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->usec % USEC_PER_SECOND);
}
/**
* g_date_time_get_seconds:
* @datetime: a #GDateTime
*
* Retrieves the number of seconds since the start of the last minute,
* including the fractional part.
*
* Returns: the number of seconds
*
* Since: 2.26
**/
gdouble
g_date_time_get_seconds (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, 0);
return (datetime->usec % USEC_PER_MINUTE) / 1000000.0;
}
/* Exporters {{{1 */
/**
* g_date_time_to_unix:
* @datetime: a #GDateTime
*
* Gives the Unix time corresponding to @datetime, rounding down to the
* nearest second.
*
* Unix time is the number of seconds that have elapsed since 1970-01-01
* 00:00:00 UTC, regardless of the time zone associated with @datetime.
*
* Returns: the Unix time corresponding to @datetime
*
* Since: 2.26
**/
gint64
g_date_time_to_unix (GDateTime *datetime)
{
return INSTANT_TO_UNIX (g_date_time_to_instant (datetime));
}
/**
* g_date_time_to_timeval:
* @datetime: a #GDateTime
* @tv: a #GTimeVal to modify
*
* Stores the instant in time that @datetime represents into @tv.
*
* The time contained in a #GTimeVal is always stored in the form of
* seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the time
* zone associated with @datetime.
*
* On systems where 'long' is 32bit (ie: all 32bit systems and all
* Windows systems), a #GTimeVal is incapable of storing the entire
* range of values that #GDateTime is capable of expressing. On those
* systems, this function returns %FALSE to indicate that the time is
* out of range.
*
* On systems where 'long' is 64bit, this function never fails.
*
* Returns: %TRUE if successful, else %FALSE
*
* Since: 2.26
**/
gboolean
g_date_time_to_timeval (GDateTime *datetime,
GTimeVal *tv)
{
tv->tv_sec = INSTANT_TO_UNIX (g_date_time_to_instant (datetime));
tv->tv_usec = datetime->usec % USEC_PER_SECOND;
return TRUE;
}
/* Timezone queries {{{1 */
/**
* g_date_time_get_utc_offset:
* @datetime: a #GDateTime
*
* Determines the offset to UTC in effect at the time and in the time
* zone of @datetime.
*
* The offset is the number of microseconds that you add to UTC time to
* arrive at local time for the time zone (ie: negative numbers for time
* zones west of GMT, positive numbers for east).
*
* If @datetime represents UTC time, then the offset is always zero.
*
* Returns: the number of microseconds that should be added to UTC to
* get the local time
*
* Since: 2.26
**/
GTimeSpan
g_date_time_get_utc_offset (GDateTime *datetime)
{
gint offset;
g_return_val_if_fail (datetime != NULL, 0);
offset = g_time_zone_get_offset (datetime->tz, datetime->interval);
return (gint64) offset * USEC_PER_SECOND;
}
/**
* g_date_time_get_timezone_abbreviation:
* @datetime: a #GDateTime
*
* Determines the time zone abbreviation to be used at the time and in
* the time zone of @datetime.
*
* For example, in Toronto this is currently "EST" during the winter
* months and "EDT" during the summer months when daylight savings
* time is in effect.
*
* Returns: (transfer none): the time zone abbreviation. The returned
* string is owned by the #GDateTime and it should not be
* modified or freed
*
* Since: 2.26
**/
const gchar *
g_date_time_get_timezone_abbreviation (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, NULL);
return g_time_zone_get_abbreviation (datetime->tz, datetime->interval);
}
/**
* g_date_time_is_daylight_savings:
* @datetime: a #GDateTime
*
* Determines if daylight savings time is in effect at the time and in
* the time zone of @datetime.
*
* Returns: %TRUE if daylight savings time is in effect
*
* Since: 2.26
**/
gboolean
g_date_time_is_daylight_savings (GDateTime *datetime)
{
g_return_val_if_fail (datetime != NULL, FALSE);
return g_time_zone_is_dst (datetime->tz, datetime->interval);
}
/* Timezone convert {{{1 */
/**
* g_date_time_to_timezone:
* @datetime: a #GDateTime
* @tz: the new #GTimeZone
*
* Create a new #GDateTime corresponding to the same instant in time as
* @datetime, but in the time zone @tz.
*
* This call can fail in the case that the time goes out of bounds. For
* example, converting 0001-01-01 00:00:00 UTC to a time zone west of
* Greenwich will fail (due to the year 0 being out of range).
*
* You should release the return value by calling g_date_time_unref()
* when you are done with it.
*
* Returns: a new #GDateTime, or %NULL
*
* Since: 2.26
**/
GDateTime *
g_date_time_to_timezone (GDateTime *datetime,
GTimeZone *tz)
{
return g_date_time_from_instant (tz, g_date_time_to_instant (datetime));
}
/**
* g_date_time_to_local:
* @datetime: a #GDateTime
*
* Creates a new #GDateTime corresponding to the same instant in time as
* @datetime, but in the local time zone.
*
* This call is equivalent to calling g_date_time_to_timezone() with the
* time zone returned by g_time_zone_new_local().
*
* Returns: the newly created #GDateTime
*
* Since: 2.26
**/
GDateTime *
g_date_time_to_local (GDateTime *datetime)
{
GDateTime *new;
GTimeZone *local;
local = g_time_zone_new_local ();
new = g_date_time_to_timezone (datetime, local);
g_time_zone_unref (local);
return new;
}
/**
* g_date_time_to_utc:
* @datetime: a #GDateTime
*
* Creates a new #GDateTime corresponding to the same instant in time as
* @datetime, but in UTC.
*
* This call is equivalent to calling g_date_time_to_timezone() with the
* time zone returned by g_time_zone_new_utc().
*
* Returns: the newly created #GDateTime
*
* Since: 2.26
**/
GDateTime *
g_date_time_to_utc (GDateTime *datetime)
{
GDateTime *new;
GTimeZone *utc;
utc = g_time_zone_new_utc ();
new = g_date_time_to_timezone (datetime, utc);
g_time_zone_unref (utc);
return new;
}
/* Format {{{1 */
static gboolean
format_z (GString *outstr,
gint offset,
guint colons)
{
gint hours;
gint minutes;
gint seconds;
hours = offset / 3600;
minutes = ABS (offset) / 60 % 60;
seconds = ABS (offset) % 60;
switch (colons)
{
case 0:
g_string_append_printf (outstr, "%+03d%02d",
hours,
minutes);
break;
case 1:
g_string_append_printf (outstr, "%+03d:%02d",
hours,
minutes);
break;
case 2:
g_string_append_printf (outstr, "%+03d:%02d:%02d",
hours,
minutes,
seconds);
break;
case 3:
g_string_append_printf (outstr, "%+03d", hours);
if (minutes != 0 || seconds != 0)
{
g_string_append_printf (outstr, ":%02d", minutes);
if (seconds != 0)
g_string_append_printf (outstr, ":%02d", seconds);
}
break;
default:
return FALSE;
}
return TRUE;
}
static void
format_number (GString *str,
gboolean use_alt_digits,
gchar *pad,
gint width,
guint32 number)
{
const gchar *ascii_digits[10] = {
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
};
const gchar **digits = ascii_digits;
const gchar *tmp[10];
gint i = 0;
g_return_if_fail (width <= 10);
#ifdef HAVE_LANGINFO_OUTDIGIT
if (use_alt_digits)
{
static const gchar *alt_digits[10];
static gsize initialised;
/* 2^32 has 10 digits */
if G_UNLIKELY (g_once_init_enter (&initialised))
{
#define DO_DIGIT(n) \
alt_digits[n] = nl_langinfo (_NL_CTYPE_OUTDIGIT## n ##_MB)
DO_DIGIT(0); DO_DIGIT(1); DO_DIGIT(2); DO_DIGIT(3); DO_DIGIT(4);
DO_DIGIT(5); DO_DIGIT(6); DO_DIGIT(7); DO_DIGIT(8); DO_DIGIT(9);
#undef DO_DIGIT
g_once_init_leave (&initialised, TRUE);
}
digits = alt_digits;
}
#endif /* HAVE_LANGINFO_OUTDIGIT */
do
{
tmp[i++] = digits[number % 10];
number /= 10;
}
while (number);
while (pad && i < width)
tmp[i++] = *pad == '0' ? digits[0] : pad;
/* should really be impossible */
g_assert (i <= 10);
while (i)
g_string_append (str, tmp[--i]);
}
static gboolean g_date_time_format_locale (GDateTime *datetime,
const gchar *format,
GString *outstr,
gboolean locale_is_utf8);
/* g_date_time_format() subroutine that takes a locale-encoded format
* string and produces a locale-encoded date/time string.
*/
static gboolean
g_date_time_locale_format_locale (GDateTime *datetime,
const gchar *format,
GString *outstr,
gboolean locale_is_utf8)
{
gchar *utf8_format;
gboolean success;
if (locale_is_utf8)
return g_date_time_format_locale (datetime, format, outstr,
locale_is_utf8);
utf8_format = g_locale_to_utf8 (format, -1, NULL, NULL, NULL);
if (!utf8_format)
return FALSE;
success = g_date_time_format_locale (datetime, utf8_format, outstr,
locale_is_utf8);
g_free (utf8_format);
return success;
}
/* g_date_time_format() subroutine that takes a UTF-8 format
* string and produces a locale-encoded date/time string.
*/
static gboolean
g_date_time_format_locale (GDateTime *datetime,
const gchar *format,
GString *outstr,
gboolean locale_is_utf8)
{
guint len;
guint colons;
gchar *tmp;
gunichar c;
gboolean alt_digits = FALSE;
gboolean pad_set = FALSE;
gchar *pad = "";
gchar *ampm;
const gchar *tz;
while (*format)
{
len = strcspn (format, "%");
if (len)
{
if (locale_is_utf8)
g_string_append_len (outstr, format, len);
else
{
tmp = g_locale_from_utf8 (format, len, NULL, NULL, NULL);
if (!tmp)
return FALSE;
g_string_append (outstr, tmp);
g_free (tmp);
}
}
format += len;
if (!*format)
break;
g_assert (*format == '%');
format++;
if (!*format)
break;
colons = 0;
alt_digits = FALSE;
pad_set = FALSE;
next_mod:
c = g_utf8_get_char (format);
format = g_utf8_next_char (format);
switch (c)
{
case 'a':
g_string_append (outstr, WEEKDAY_ABBR (datetime));
break;
case 'A':
g_string_append (outstr, WEEKDAY_FULL (datetime));
break;
case 'b':
g_string_append (outstr, MONTH_ABBR (datetime));
break;
case 'B':
g_string_append (outstr, MONTH_FULL (datetime));
break;
case 'c':
{
if (!g_date_time_locale_format_locale (datetime, PREFERRED_DATE_TIME_FMT,
outstr, locale_is_utf8))
return FALSE;
}
break;
case 'C':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_year (datetime) / 100);
break;
case 'd':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_day_of_month (datetime));
break;
case 'e':
format_number (outstr, alt_digits, pad_set ? pad : " ", 2,
g_date_time_get_day_of_month (datetime));
break;
case 'F':
g_string_append_printf (outstr, "%d-%02d-%02d",
g_date_time_get_year (datetime),
g_date_time_get_month (datetime),
g_date_time_get_day_of_month (datetime));
break;
case 'g':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_week_numbering_year (datetime) % 100);
break;
case 'G':
format_number (outstr, alt_digits, pad_set ? pad : 0, 0,
g_date_time_get_week_numbering_year (datetime));
break;
case 'h':
g_string_append (outstr, MONTH_ABBR (datetime));
break;
case 'H':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_hour (datetime));
break;
case 'I':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
(g_date_time_get_hour (datetime) + 11) % 12 + 1);
break;
case 'j':
format_number (outstr, alt_digits, pad_set ? pad : "0", 3,
g_date_time_get_day_of_year (datetime));
break;
case 'k':
format_number (outstr, alt_digits, pad_set ? pad : " ", 2,
g_date_time_get_hour (datetime));
break;
case 'l':
format_number (outstr, alt_digits, pad_set ? pad : " ", 2,
(g_date_time_get_hour (datetime) + 11) % 12 + 1);
break;
case 'n':
g_string_append_c (outstr, '\n');
break;
case 'm':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_month (datetime));
break;
case 'M':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_minute (datetime));
break;
case 'O':
alt_digits = TRUE;
goto next_mod;
case 'p':
ampm = (gchar *) GET_AMPM (datetime);
if (!locale_is_utf8)
{
ampm = tmp = g_locale_to_utf8 (ampm, -1, NULL, NULL, NULL);
if (!tmp)
return FALSE;
}
ampm = g_utf8_strup (ampm, -1);
if (!locale_is_utf8)
{
g_free (tmp);
tmp = g_locale_from_utf8 (ampm, -1, NULL, NULL, NULL);
g_free (ampm);
if (!tmp)
return FALSE;
ampm = tmp;
}
g_string_append (outstr, ampm);
g_free (ampm);
break;
case 'P':
ampm = (gchar *) GET_AMPM (datetime);
if (!locale_is_utf8)
{
ampm = tmp = g_locale_to_utf8 (ampm, -1, NULL, NULL, NULL);
if (!tmp)
return FALSE;
}
ampm = g_utf8_strdown (ampm, -1);
if (!locale_is_utf8)
{
g_free (tmp);
tmp = g_locale_from_utf8 (ampm, -1, NULL, NULL, NULL);
g_free (ampm);
if (!tmp)
return FALSE;
ampm = tmp;
}
g_string_append (outstr, ampm);
g_free (ampm);
break;
case 'r':
{
if (!g_date_time_locale_format_locale (datetime, PREFERRED_12HR_TIME_FMT,
outstr, locale_is_utf8))
return FALSE;
}
break;
case 'R':
g_string_append_printf (outstr, "%02d:%02d",
g_date_time_get_hour (datetime),
g_date_time_get_minute (datetime));
break;
case 's':
g_string_append_printf (outstr, "%" G_GINT64_FORMAT, g_date_time_to_unix (datetime));
break;
case 'S':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_second (datetime));
break;
case 't':
g_string_append_c (outstr, '\t');
break;
case 'T':
g_string_append_printf (outstr, "%02d:%02d:%02d",
g_date_time_get_hour (datetime),
g_date_time_get_minute (datetime),
g_date_time_get_second (datetime));
break;
case 'u':
format_number (outstr, alt_digits, 0, 0,
g_date_time_get_day_of_week (datetime));
break;
case 'V':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_week_of_year (datetime));
break;
case 'w':
format_number (outstr, alt_digits, 0, 0,
g_date_time_get_day_of_week (datetime) % 7);
break;
case 'x':
{
if (!g_date_time_locale_format_locale (datetime, PREFERRED_DATE_FMT,
outstr, locale_is_utf8))
return FALSE;
}
break;
case 'X':
{
if (!g_date_time_locale_format_locale (datetime, PREFERRED_TIME_FMT,
outstr, locale_is_utf8))
return FALSE;
}
break;
case 'y':
format_number (outstr, alt_digits, pad_set ? pad : "0", 2,
g_date_time_get_year (datetime) % 100);
break;
case 'Y':
format_number (outstr, alt_digits, 0, 0,
g_date_time_get_year (datetime));
break;
case 'z':
{
gint64 offset;
if (datetime->tz != NULL)
offset = g_date_time_get_utc_offset (datetime) / USEC_PER_SECOND;
else
offset = 0;
if (!format_z (outstr, (int) offset, colons))
return FALSE;
}
break;
case 'Z':
tz = g_date_time_get_timezone_abbreviation (datetime);
if (!locale_is_utf8)
{
tz = tmp = g_locale_from_utf8 (tz, -1, NULL, NULL, NULL);
if (!tmp)
return FALSE;
}
g_string_append (outstr, tz);
if (!locale_is_utf8)
g_free (tmp);
break;
case '%':
g_string_append_c (outstr, '%');
break;
case '-':
pad_set = TRUE;
pad = "";
goto next_mod;
case '_':
pad_set = TRUE;
pad = " ";
goto next_mod;
case '0':
pad_set = TRUE;
pad = "0";
goto next_mod;
case ':':
/* Colons are only allowed before 'z' */
if (*format && *format != 'z' && *format != ':')
return FALSE;
colons++;
goto next_mod;
default:
return FALSE;
}
}
return TRUE;
}
/**
* g_date_time_format:
* @datetime: A #GDateTime
* @format: a valid UTF-8 string, containing the format for the
* #GDateTime
*
* Creates a newly allocated string representing the requested @format.
*
* The format strings understood by this function are a subset of the
* strftime() format language as specified by C99. The \%D, \%U and \%W
* conversions are not supported, nor is the 'E' modifier. The GNU
* extensions \%k, \%l, \%s and \%P are supported, however, as are the
* '0', '_' and '-' modifiers.
*
* In contrast to strftime(), this function always produces a UTF-8
* string, regardless of the current locale. Note that the rendering of
* many formats is locale-dependent and may not match the strftime()
* output exactly.
*
* The following format specifiers are supported:
*
* - \%a: the abbreviated weekday name according to the current locale
* - \%A: the full weekday name according to the current locale
* - \%b: the abbreviated month name according to the current locale
* - \%B: the full month name according to the current locale
* - \%c: the preferred date and time representation for the current locale
* - \%C: the century number (year/100) as a 2-digit integer (00-99)
* - \%d: the day of the month as a decimal number (range 01 to 31)
* - \%e: the day of the month as a decimal number (range 1 to 31)
* - \%F: equivalent to `%Y-%m-%d` (the ISO 8601 date format)
* - \%g: the last two digits of the ISO 8601 week-based year as a
* decimal number (00-99). This works well with \%V and \%u.
* - \%G: the ISO 8601 week-based year as a decimal number. This works
* well with \%V and \%u.
* - \%h: equivalent to \%b
* - \%H: the hour as a decimal number using a 24-hour clock (range 00 to 23)
* - \%I: the hour as a decimal number using a 12-hour clock (range 01 to 12)
* - \%j: the day of the year as a decimal number (range 001 to 366)
* - \%k: the hour (24-hour clock) as a decimal number (range 0 to 23);
* single digits are preceded by a blank
* - \%l: the hour (12-hour clock) as a decimal number (range 1 to 12);
* single digits are preceded by a blank
* - \%m: the month as a decimal number (range 01 to 12)
* - \%M: the minute as a decimal number (range 00 to 59)
* - \%p: either "AM" or "PM" according to the given time value, or the
* corresponding strings for the current locale. Noon is treated as
* "PM" and midnight as "AM".
* - \%P: like \%p but lowercase: "am" or "pm" or a corresponding string for
* the current locale
* - \%r: the time in a.m. or p.m. notation
* - \%R: the time in 24-hour notation (\%H:\%M)
* - \%s: the number of seconds since the Epoch, that is, since 1970-01-01
* 00:00:00 UTC
* - \%S: the second as a decimal number (range 00 to 60)
* - \%t: a tab character
* - \%T: the time in 24-hour notation with seconds (\%H:\%M:\%S)
* - \%u: the ISO 8601 standard day of the week as a decimal, range 1 to 7,
* Monday being 1. This works well with \%G and \%V.
* - \%V: the ISO 8601 standard week number of the current year as a decimal
* number, range 01 to 53, where week 1 is the first week that has at
* least 4 days in the new year. See g_date_time_get_week_of_year().
* This works well with \%G and \%u.
* - \%w: the day of the week as a decimal, range 0 to 6, Sunday being 0.
* This is not the ISO 8601 standard format -- use \%u instead.
* - \%x: the preferred date representation for the current locale without
* the time
* - \%X: the preferred time representation for the current locale without
* the date
* - \%y: the year as a decimal number without the century
* - \%Y: the year as a decimal number including the century
* - \%z: the time zone as an offset from UTC (+hhmm)
* - \%:z: the time zone as an offset from UTC (+hh:mm).
* This is a gnulib strftime() extension. Since: 2.38
* - \%::z: the time zone as an offset from UTC (+hh:mm:ss). This is a
* gnulib strftime() extension. Since: 2.38
* - \%:::z: the time zone as an offset from UTC, with : to necessary
* precision (e.g., -04, +05:30). This is a gnulib strftime() extension. Since: 2.38
* - \%Z: the time zone or name or abbreviation
* - \%\%: a literal \% character
*
* Some conversion specifications can be modified by preceding the
* conversion specifier by one or more modifier characters. The
* following modifiers are supported for many of the numeric
* conversions:
*
* - O: Use alternative numeric symbols, if the current locale supports those.
* - _: Pad a numeric result with spaces. This overrides the default padding
* for the specifier.
* - -: Do not pad a numeric result. This overrides the default padding
* for the specifier.
* - 0: Pad a numeric result with zeros. This overrides the default padding
* for the specifier.
*
* Returns: a newly allocated string formatted to the requested format
* or %NULL in the case that there was an error. The string
* should be freed with g_free().
*
* Since: 2.26
*/
gchar *
g_date_time_format (GDateTime *datetime,
const gchar *format)
{
GString *outstr;
gchar *utf8;
gboolean locale_is_utf8 = g_get_charset (NULL);
g_return_val_if_fail (datetime != NULL, NULL);
g_return_val_if_fail (format != NULL, NULL);
g_return_val_if_fail (g_utf8_validate (format, -1, NULL), NULL);
outstr = g_string_sized_new (strlen (format) * 2);
if (!g_date_time_format_locale (datetime, format, outstr, locale_is_utf8))
{
g_string_free (outstr, TRUE);
return NULL;
}
if (locale_is_utf8)
return g_string_free (outstr, FALSE);
utf8 = g_locale_to_utf8 (outstr->str, outstr->len, NULL, NULL, NULL);
g_string_free (outstr, TRUE);
return utf8;
}
/* Epilogue {{{1 */
/* vim:set foldmethod=marker: */
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