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-rw-r--r--src/corelib/time/qtimezone.cpp5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/corelib/time/qtimezone.cpp b/src/corelib/time/qtimezone.cpp
index 1f041c14fb..57ddef4e2d 100644
--- a/src/corelib/time/qtimezone.cpp
+++ b/src/corelib/time/qtimezone.cpp
@@ -209,7 +209,10 @@ Q_GLOBAL_STATIC(QTimeZoneSingleton, global_tz);
standard time in the time zone. The daylight-saving time offset is the
number of seconds to add to the standard time offset to obtain
daylight-saving time (abbreviated DST and sometimes called "daylight time"
- or "summer time") in the time zone.
+ or "summer time") in the time zone. The usual case for DST (using
+ standard time in winter, DST in summer) has a positive daylight-saving
+ time offset. However, some zones have negative DST offsets, used in
+ winter, with summer using standard time.
Note that the standard and DST offsets for a time zone may change over time
as countries have changed DST laws or even their standard time offset.