Time Zone History

Time zone history in Antarctica

7 zones of the tz database have their reference point in Antarctica. They use 5 different standard times today; the most common is UTC−3, kept by 2 zones. 1 still change their clocks during the year. 1 used daylight saving time at some point since 1970 and no longer do, most recently in 2016. The record with the most changes of standard time since 1970 is Casey Station, with 16 times.

Standard times in use

UTC+81 zoneUTC+71 zoneUTC+52 zonesUTC+01 zoneUTC−32 zonesUTC+81 zoneUTC+71 zoneUTC+52 zonesUTC+01 zoneUTC−32 zones

Every zone, with its clock changes since 1970

The strip shows 1970 to 2028; amber marks years with seasonal clock changes.

ZoneStandard timeClock changes todayNew standard times since 19701970 to 2028
Casey Station, AntarcticaUTC+8no16
Davis Station, AntarcticaUTC+7no4
Mawson Station, AntarcticaUTC+5no1
Vostok Station, AntarcticaUTC+5no3
Troll Station, AntarcticaUTC+0yes0
Palmer Station, AntarcticaUTC−3no (last 2016)2
Rothera Station, AntarcticaUTC−3no0