HDT to U Converter
HDT is not used on this date
This converter keeps HDT at UTC−9. Adak uses HST (UTC−10) on this date. Open the HST converter, or choose Honolulu, Pearl City, or Hilo for city-specific time.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
3:00 am03:00 HDT (UTC-9), Nov 10, 2026 = 4:00 am04:00 U (UTC-8), Nov 10, 2026
HDT is 1 hour behind U.
HDT and U examples
These examples always use HDT (UTC-9) and U (UTC-8). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
HDT is 1 hour behind U.
How the time difference changes
HDT is 1 hour behind U year-round.
Working hours of 9:00 am to 6:00 pm in HDT correspond to 10:00 am to 7:00 pm in U.Working hours of 09:00 to 18:00 in HDT correspond to 10:00 to 19:00 in U.
Compare HDT time with U time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Hawaii-Aleutian Daylight Time is 1 hour behind Uniform Time Zone.
3:00 am03:00 in HDT is 4:00 am04:00 in U
HDT to U call time
Best time for a conference call or a meeting is between 9am-5pm09:00-17:00 in HDT which corresponds to 10am-6pm10:00-18:00 in U.
3:00 am03:00 Hawaii-Aleutian Daylight Time (HDT). Offset UTC -9:00 hours
4:00 am04:00 Uniform Time Zone (U). Offset UTC -8:00 hours
3:00 am03:00 HDT / 4:00 am04:00 U
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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Hawaii-Aleutian Daylight Time
Offset: HDT is 9 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Today the shaded areas are on UTC−10 (HST).
Daylight Saving: Hawaii-Aleutian Daylight Time (HDT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Hawaii-Aleutian Standard Time (HAST).
End: Hawaii-Aleutian Daylight Time (HDT) ended on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
Start: Hawaii-Aleutian Daylight Time (HDT) starts on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
See USA daylight saving time and upcoming clock changes worldwide.
HDT representations, usage and related time zones
- -09 - basic short
- -0900 - basic
- -09:00 - extended
- -0900 - sign character (-) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the west of the zero meridian.
- Victor - Military abbreviation for HDT
- V - short form of 'Victor'
- America/Adak
- America/Atka
- US/Aleutian
- AKST - Alaska Standard Time
- AHDT - Alaska-Hawaii Daylight Time
- HADT - Hawaii-Aleutian Daylight Time
- GAMT - Gambier Time
- HDT - Hawaii-Aleutian Daylight Time
- V - Victor Time Zone
Uniform Time Zone
Offset: U is 8 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Mexico, Pitcairn, United States
Principal Cities: The largest city in the U time zone is Los Angeles in the United States, with about 3.821 million people. Other major cities in this time zone include Tijuana, San Diego, Mexicali, San Jose.
Daylight Saving: Some places on Uniform Time Zone (U) keep the same time all year, while others use U for only part of the year and change their clocks for daylight saving time; see upcoming clock changes worldwide.
Today some of the shaded areas are on UTC−9 (AKST).
U representations, usage and related time zones
- -08 - basic short
- -0800 - basic
- -08:00 - extended
- -0800 - sign character (-) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the west of the zero meridian.
- Uniform - Military abbreviation for U
- U - short form of 'Uniform'
- AKDT - Alaska Daylight Time
- PST - Pacific Standard Time
- PT - Pacific Time
- PST - Pitcairn Standard Time
- U - Uniform Time Zone