UTC−10 time now
3:40AM
UTC−10
−5 h vs New York (you)HST · HAST
About UTC−10
UTC−10 is 10 hours behind Coordinated Universal Time: when it is noon UTC, it is 2:00 AM at UTC−10.
3 zones keep UTC−10 all year, covering 3 countries or territories: United States, French Polynesia and Cook Islands.
1 zone uses it only in winter and moves to UTC−9 in summer, for example Adak.
For a fixed offset in software, tzdata provides Etc/GMT+10; note the inverted sign of these POSIX-style names.
Abbreviations for UTC−10: HST (Hawaii-Aleutian Standard Time), HAST (Hawaii-Aleutian Standard Time (old abbreviation)).
UTC−10 and the sun
Across the large cities that keep UTC−10 all year, the clock runs 2 minutes behind mean solar time in Papeete (-149.6°) and 39 minutes ahead of it in Avarua (-159.8°). The offset’s own meridian is 150° west: the further a city lies from it, the further its clocks drift from the sun.
Neighbouring offsets: UTC−11 (Pago Pago and Alofi) and UTC−9:30 (Marquesas).
Zones that moved to or from UTC−10 since 1970
Changes of the winter (standard) offset recorded in tzdata; ordinary seasonal daylight saving changes are not counted:
- Friday, December 30, 2011: Apia (Pacific/Apia) moved from UTC−10 to UTC+13
- Saturday, September 24, 2011: Apia (Pacific/Apia) moved from UTC−11 to UTC−10
- Saturday, December 31, 1994: Kiritimati (Pacific/Kiritimati) moved from UTC−10 to UTC+14
- Sunday, April 24, 1983: Adak (America/Adak) moved from UTC−11 to UTC−10
- Sunday, April 24, 1983: Anchorage (America/Anchorage) moved from UTC−10 to UTC−9
- Monday, October 1, 1979: Kiritimati (Pacific/Kiritimati) moved from UTC−10:40 to UTC−10
- Sunday, November 12, 1978: Avarua (Pacific/Rarotonga) moved from UTC−10:30 to UTC−10
Since when UTC−10 has been used
The tzdata record of each zone that keeps UTC−10 as its standard time, with the date it moved to UTC−10 and the time it kept before. The earliest is Faaa, on UTC−10 since Tuesday, October 1, 1912; the most recent is Adak, since Sunday, October 30, 1983.
UTC−10 converted to other offsets
Fixed offsets only, so the table holds on any date; a city that observes daylight saving time is an hour later than its standard column in summer.
| UTC−10 | UTC (UTC+0) | EST (UTC−5) | PST (UTC−8) | CET (UTC+1) | IST (UTC+5:30) | JST (UTC+9) | AEST (UTC+10) |
|---|---|---|---|---|---|---|---|
| 12:00 AM | 10:00 AM | 5:00 AM | 2:00 AM | 11:00 AM | 3:30 PM | 7:00 PM | 8:00 PM |
| 6:00 AM | 4:00 PM | 11:00 AM | 8:00 AM | 5:00 PM | 9:30 PM | 1:00 AM (+1 day) | 2:00 AM (+1 day) |
| 9:00 AM | 7:00 PM | 2:00 PM | 11:00 AM | 8:00 PM | 12:30 AM (+1 day) | 4:00 AM (+1 day) | 5:00 AM (+1 day) |
| 12:00 PM | 10:00 PM | 5:00 PM | 2:00 PM | 11:00 PM | 3:30 AM (+1 day) | 7:00 AM (+1 day) | 8:00 AM (+1 day) |
| 3:00 PM | 1:00 AM (+1 day) | 8:00 PM | 5:00 PM | 2:00 AM (+1 day) | 6:30 AM (+1 day) | 10:00 AM (+1 day) | 11:00 AM (+1 day) |
| 6:00 PM | 4:00 AM (+1 day) | 11:00 PM | 8:00 PM | 5:00 AM (+1 day) | 9:30 AM (+1 day) | 1:00 PM (+1 day) | 2:00 PM (+1 day) |
| 9:00 PM | 7:00 AM (+1 day) | 2:00 AM (+1 day) | 11:00 PM | 8:00 AM (+1 day) | 12:30 PM (+1 day) | 4:00 PM (+1 day) | 5:00 PM (+1 day) |
On UTC−10 all year
| Main city | Zone | Countries | Now |
|---|---|---|---|
| Honolulu | Pacific/Honolulu | United States | 3:40 AM UTC−10 |
| Faaa | Pacific/Tahiti | French Polynesia | 3:40 AM UTC−10 |
| Avarua | Pacific/Rarotonga | Cook Islands | 3:40 AM UTC−10 |
On UTC−10 in winter only
| Main city | Zone | Countries | Now |
|---|---|---|---|
| Adak | America/Adak | United States | 3:40 AM UTC−10 |