Sources for time zone and daylight saving time data | iana time zone
SourcesfortimezoneanddaylightsavingtimedataTimezone[1]anddaylight-saving[2]rulesarecontrolledbyindividualgovernments.Theyaresometimeschangedwithlittlenotice,andtheirhistoriesandplannedfuturesareoftenrecordedonlyfitfully.Hereisasummaryofattemptstoorganizeandrecordrelevantdatainthisarea.ThetzdatabaseThepublic-domain[3]timezonedatabasecontainscodeanddatathatrepresentthehistoryoflocaltimeformanyrepresentativelocationsaroundtheglobe.Itisupdatedperiodicallytoreflectchangesmadebypoliticalbodiestoti...
Sources for time zone and daylight saving time dataTime zone[1] and daylight-saving[2] rules are controlled by individual governments. They are sometimes changed with little notice, and their histories and planned futures are often recorded only fitfully. Here is a summary of attempts to organize and record relevant data in this area.
The tz databaseThe public-domain[3] time zone database contains code and data that represent the history of local time for many representative locations around the globe. It is updated periodically to reflect changes made by political bodies to time zone boundaries and daylight saving rules. This database (known as tz, tzdb, or zoneinfo) is used by several implementations, including the GNU C Library[4] (used in GNU/Linux[5]), Android[6], FreeBSD[7], NetBSD[8], OpenBSD[9], Chromium OS[10], Cygwin[11], DJGPP[12], MINIX[13], MySQL[14], webOS[15], AIX[16], BlackBerry 10[17], iOS[18], macOS[19], Microsoft Windows[20], OpenVMS[21], Oracle Datab...