glib/tests/gdatetime: use UTC time in test_GDateTime_diff()

test_GDateTime_diff() checks that the span from 2009-01-01 to
2010-01-01 is exactly 365 * G_TIME_SPAN_DAY, but it does this using
local time, and so fails if you are in a timezone that is in the
southern hemisphere which only did DST during one of 2008-2009 and
2009-2010 (in which case the year will end up being one hour too long
or too short).

Switch the diff tests to use UTC time instead; there are plenty of
other local time tests already.

https://bugzilla.gnome.org/show_bug.cgi?id=701529

diff --git a/glib/tests/gdatetime.c b/glib/tests/gdatetime.c
index 4f82929..3bb5ebb 100644 (file)
--- a/glib/tests/gdatetime.c
+++ b/glib/tests/gdatetime.c
@@ -550,8 +550,8 @@ test_GDateTime_diff (void)
 #define TEST_DIFF(y,m,d,y2,m2,d2,u) G_STMT_START { \
   GDateTime *dt1, *dt2; \
   GTimeSpan  ts = 0; \
-  dt1 = g_date_time_new_local (y, m, d, 0, 0, 0); \
-  dt2 = g_date_time_new_local (y2, m2, d2, 0, 0, 0); \
+  dt1 = g_date_time_new_utc (y, m, d, 0, 0, 0); \
+  dt2 = g_date_time_new_utc (y2, m2, d2, 0, 0, 0); \
   ts = g_date_time_difference (dt2, dt1); \
   g_assert_cmpint (ts, ==, u); \
   g_date_time_unref (dt1); \