The Info List - UTC−12

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UTC−12:00 is a time offset that subtracts 12 hours from Coordinated Universal Time (UTC). It is the last to celebrate a New Year, and it is sometimes referred to as the International Date Line West time zone (IDLW).[1]


1 As standard time (all year round)

1.1 Oceania

2 Characteristics of the time zone which observes UTC-12 3 See also 4 References

As standard time (all year round)[edit] Oceania[edit]

United States

Baker Island
Baker Island
and Howland Island
Howland Island
(uninhabited islands belonging to the United States)

is a nautical time zone comprising the high seas between 180° and 172°30′W longitude, and the time is obtained by subtracting twelve hours from Coordinated Universal Time. Ships using this time are the last to begin each calendar day. Characteristics of the time zone which observes UTC-12[edit] A number of inhabited islands lie within the longitudinal limits of this time zone, but none of them keeps the date and time of UTC-12. Instead, they keep the time and date (or just the date) of one of the neighbouring zones, usually because they belong, politically, to an island group whose other members lie mostly in the neighbouring time zone. Since the International Date Line West (IDLW) time-zone represents the last place on Earth
where any date exists, it is sometimes used for deadlines and referred to as Anywhere on Earth
(AoE). This means that if the deadline has not passed in the UTC–12 zone, the deadline has not yet passed.[1] See also[edit]

Greenwich Mean Time Howland and Baker islands UTC+12:00 UTC+14:00, the first time zone to start a new day


^ a b "IEEE 802.16 AOE Deadline Documentation". IEEE 802 LAN/MAN Standards Committee. Retrieved 1 January 2018. 

Flightsim Aviation Zone

v t e

Coordinated Universal Time
Coordinated Universal Time

UTC offset for standard time and Daylight saving time
Daylight saving time
(DST) Italics: historical or unofficial

180° to < 90°W

−12:00 −11:00 −10:30 −10:00 −09:30 −09:00 −08:30 −08:00 −07:00

90°W to < 0°

−06:00 −05:00 −04:30 −04:00 −03:30 −03:00 −02:30 −02:00 −01:00 −00:44 −00:25:21

0° to < 90°E

±00:00 +00:20 +00:30 +01:00 +01:24 +01:30 +02:00 +02:30 +03:00 +03:30 +04:00 +04:30 +04:51 +05:00 +05:30 +05:40 +05:45

90°E to < 180°

+06:00 +06:30 +07:00 +07:20 +07:30 +08:00 +08:30 +08:45 +09:00 +09:30 +09:45 +10:00 +10:30 +11:00 +11:30

(180° to < 90°W)

+12:00 +12:45 +13:00 +13:45 +14:00

Time zone
Time zone
data sources

tz database

Lists of time zones

Time zones by country Time zones by UTC offset tz database time zones Military time zones Time zone
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