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Diffstat (limited to 'src/corelib/global/qnamespace.qdoc')
| -rw-r--r-- | src/corelib/global/qnamespace.qdoc | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc index 97d79f4b1e..dd6fccd678 100644 --- a/src/corelib/global/qnamespace.qdoc +++ b/src/corelib/global/qnamespace.qdoc @@ -728,10 +728,26 @@ /*! \enum Qt::TimeSpec - \value LocalTime Locale dependent time (Timezones and Daylight Savings Time). - \value UTC Coordinated Universal Time, replaces Greenwich Mean Time. + \value LocalTime Local time, controlled by a system time-zone setting. + \value UTC Coordinated Universal Time. \value OffsetFromUTC An offset in seconds from Coordinated Universal Time. - \value TimeZone A named time zone using a specific set of Daylight Savings rules. + \value TimeZone A named time zone. + + Both LocalTime and TimeZone will take care of transitions, such as + the start and end of daylight-saving time. UTC is the standard + time relative to which time-zones are usually specified: Greenwich + Mean Time has zero offset from it. Neither UTC nor OffsetFromUTC + has any transitions. + + \note After a change to the system time-zone setting, the behavior + of LocalTime-based QDateTime objects created before the change is + undefined: QDateTime may have cached data that the change + invalidates. (This is not triggered by transitions of the system + time-zone.) In long-running processes, updates to the system's + time-zone data (e.g. when politicians change the rules for a zone) + may likewise lead to conflicts between the updated time-zone + information and data cached by QDateTime objects created before + the update, using either LocalTime or TimeZone. */ /*! |