diff --git a/localedata/locales/csb_PL b/localedata/locales/csb_PL
index 663fd6c..93c9ae2 100644
--- localedata/locales/csb_PL
+++ localedata/locales/csb_PL
@@ -184,7 +184,7 @@ t_fmt_ampm ""
 date_fmt       "<U0025><U0061><U0020><U0025><U0062><U0020><U0025><U0065>/
 <U0020><U0025><U0048><U003A><U0025><U004D><U003A><U0025><U0053><U0020>/
 <U0025><U005A><U0020><U0025><U0059>"
-week    7;19971201;4
+week    7;19971130;4
 first_weekday 2
 first_workday 2
 END LC_TIME
diff --git a/localedata/locales/en_GB b/localedata/locales/en_GB
index fe58f1f..6a81d6d 100644
--- localedata/locales/en_GB
+++ localedata/locales/en_GB
@@ -121,7 +121,7 @@ t_fmt_ampm  ""
 date_fmt	"<U0025><U0061><U0020><U0025><U0062><U0020><U0025><U0065>/
 <U0020><U0025><U0048><U003A><U0025><U004D><U003A><U0025><U0053><U0020>/
 <U0025><U005A><U0020><U0025><U0059>"
-week    7;19971201;4
+week    7;19971130;4
 first_weekday 2
 first_workday 2
 END LC_TIME