UTC−10:30

UTC−10:30 is an identifier for a time offset from UTC of −10:30.

Hawaii used a standard time of GMT−10:30 from 1900 until 1947, when clocks were changed to GMT−10:00 zone, which later was changed to UTC−10.

The air portion of the attack on Pearl Harbor in 1941 began at December 7, 7:48 a.m. Hawaiian Time and December 8, 3:18 a.m. Japanese Standard Time (UTC+09), as kept by ships of the Kido Butai. UTC time in ISO 8601 notation was 1941-12-07T18:18+00:00.

Coordinated Universal Time (UTC)

UTC offset for standard time and
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 data sources

tz database

Lists of time zones

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tz database time zones
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