HADT to U Converter
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Quick answers
Selected conversion
3:00 am03:00 HADT (UTC-9), Oct 21, 2026 = 4:00 am04:00 U (UTC-8), Oct 21, 2026
HADT is 1 hour behind U.
HADT and U examples
These examples always use HADT (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.
HADT is 1 hour behind U.
How the time difference changes
For most of the year, HADT is 1 hour behind U. From Nov 1, 2026 to Mar 14, 2027, HST is 2 hours behind U.
For most of the year, working hours of 9:00 am to 6:00 pm in HADT correspond to 10:00 am to 7:00 pm in U. At other times of the year, working hours of 9:00 am to 6:00 pm in HST correspond to 11:00 am to 8:00 pm in U.For most of the year, working hours of 09:00 to 18:00 in HADT correspond to 10:00 to 19:00 in U. At other times of the year, working hours of 09:00 to 18:00 in HST correspond to 11:00 to 20:00 in U.
Compare HADT 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 HADT is 4:00 am04:00 in U
HADT to U call time
Best time for a conference call or a meeting is between 9am-5pm09:00-17:00 in HADT which corresponds to 10am-6pm10:00-18:00 in U
3:00 am03:00 Hawaii-Aleutian Daylight Time (HADT). Offset UTC -9:00 hours
4:00 am04:00 Uniform Time Zone (U). Offset UTC -8:00 hours
3:00 am03:00 HADT / 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: HADT is 9 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Today all shaded areas are on HADT.
Daylight Saving: Hawaii-Aleutian Daylight Time (HADT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Hawaii-Aleutian Standard Time (HAST).
Start: Hawaii-Aleutian Daylight Time (HADT) started 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. Daylight saving starts annually on the second Sunday of March.
End: Hawaii-Aleutian Daylight Time (HADT) ends 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 local standard time instead. Daylight saving ends annually on the first Sunday of November.
See USA daylight saving time and upcoming clock changes worldwide.
HADT 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 HADT
- V - short form of 'Victor'
- AKST - Alaska Standard Time
- AHDT - Alaska-Hawaii Daylight Time
- HADT - Hawaii-Aleutian Daylight Time
- GAMT - Gambier Time
- HDT - Hawaii 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−7 (PDT).
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