Files
glib/glib
Philip Withnall 12a7727352 tests: Use a different time for testing UNIX timestamps
The test_GDateTime_new_from_unix() test creates a UNIX timestamp
representing 1990-01-01 00:00:00 in the local timezone, and then turns
it into a GDateTime using g_date_time_new_from_unix_local(). This should
succeed regardless of the current local timezone (TZ environment
variable).

However, it was failing for TZ=America/Lima, and *only* for that
timezone.

As it turns out, Lima used to have a DST leap at exactly 00:00:00 on the
1st of January — but this stopped in 1994, which made investigation a
bit harder. See:
https://www.timeanddate.com/time/change/peru/lima?year=1990.

What was happening is that 1990-01-01 00:00:00 was being converted to
the timestamp 631170000, but GDateTime was converting that timestamp to
1990-01-01 01:00:00 when loading it. Both conversions are correct: a DST
leap creates an equivalence between an hour’s worth of timestamps.

We can somewhat validate this by seeing that timestamp 631169999 maps to
1989-12-31 23:59:59, and timestamp 631170001 maps to 1990-01-01
01:00:01.

Fix this by changing the date used by the test to one where no timezone
was undergoing a DST leap in 1990. This should never change, as all that
data is now historical.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=793319
2018-02-13 15:57:53 +00:00
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