UTC to HAST Converter
HAST is not used on this date
This converter keeps HAST at UTC−10. Adak uses HDT (UTC−9) on this date. Open the HDT converter.Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
12:00 pm12:00 UTC (UTC+0), Oct 17, 2026 = 2:00 am02:00 HAST (UTC-10), Oct 17, 2026
UTC is 10 hours ahead of HAST.
UTC and HAST examples
These examples always use UTC (UTC+0) and HAST (UTC-10). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
UTC is 10 hours ahead of HAST.
How the time difference changes
UTC is 10 hours ahead of HAST year-round.
Working hours of 9:00 am to 6:00 pm in UTC correspond to 11:00 pm (previous day) to 8:00 am in HAST.Working hours of 09:00 to 18:00 in UTC correspond to 23:00 (previous day) to 08:00 in HAST.
Compare UTC time with HAST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Coordinated Universal Time is 10 hours ahead of Hawaii-Aleutian Standard Time.
12:00 pm12:00 in UTC is 2:00 am02:00 in HAST
UTC to HAST call time
Best time for a conference call or a meeting is between 6pm-7pm18:00-19:00 in UTC which corresponds to 8am-9am08:00-09:00 in HAST. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
12:00 pm12:00 Coordinated Universal Time (UTC). Offset UTC 0:00 hours
2:00 am02:00 Hawaii-Aleutian Standard Time (HAST). Offset UTC -10:00 hours
12:00 pm12:00 UTC / 2:00 am02:00 HAST
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
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Coordinated Universal Time
Offset: UTC is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Antarctica, Burkina Faso, Faroe Islands, Gambia, Ghana, Greenland, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Morocco, Portugal, Saint Helena, São Tomé and Príncipe, Senegal, Sierra Leone, Spain, Togo, United Kingdom, Western Sahara
Principal Cities: The largest city in the UTC time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Casablanca, Dakar.
Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is the successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but UTC is the standard the scientific community uses.
UTC has been the time standard commonly used across the world since 1972. It is used in many technical fields, such as aviation and meteorology, and to synchronize time across internet networks.
Today some of the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time, WEST).
UTC representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for UTC
- Z - short form of 'Zulu'
- Etc/UCT
- Etc/UTC
- Etc/Universal
- Etc/Zulu
- UCT
- UTC
- Universal
- Zulu
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone
Hawaii-Aleutian Standard Time
Offset: HAST is 10 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Today the shaded areas are on UTC−9 (HDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Hawaii-Aleutian Daylight Time (HADT).
End: Hawaii-Aleutian Standard Time (HAST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Hawaii-Aleutian Standard Time (HAST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
See USA daylight saving time and upcoming clock changes worldwide.
HAST representations, usage and related time zones
- -10 - basic short
- -1000 - basic
- -10:00 - extended
- -1000 - sign character (-) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the west of the zero meridian.
- Whiskey - Military abbreviation for HAST
- W - short form of 'Whiskey'
- HAST - Hawaii-Aleutian Standard Time
- CKT - Cook Island Time
- HST - Hawaii Standard Time
- TAHT - Tahiti Time
- W - Whiskey Time Zone