UTC
Universal Time Coordinated
GMT +0
HST/HDT
Hawaii Standard Time
GMT -10
HDT automatically adjusted to HST time zone, that is in use

Time Difference

Universal Time Coordinated is 10 hours ahead of Hawaii Standard Time
11:00 am11:00 in UTC is 1:00 am01:00 in HST

UTC to HDT call time
Best time for a conference call or a meeting is between 5pm-7pm in UTC which corresponds to 8am-10am in HDT

11:00 am11:00 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
1:00 am01:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours

11:00 am11:00 UTC / 1:00 am01:00 HST

UTC HST
12am (midnight) 2pm
1am 3pm
2am 4pm
3am 5pm
4am 6pm
5am 7pm
6am 8pm
7am 9pm
8am 10pm
9am 11pm
10am 12am (midnight)
11am 1am
12pm (noon) 2am
1pm 3am
2pm 4am
3pm 5am
4pm 6am
5pm 7am
6pm 8am
7pm 9am
8pm 10am
9pm 11am
10pm 12pm (noon)
11pm 1pm
0:00 14:00
1:00 15:00
2:00 16:00
3:00 17:00
4:00 18:00
5:00 19:00
6:00 20:00
7:00 21:00
8:00 22:00
9:00 23:00
10:00 0:00
11:00 1:00
12:00 2:00
13:00 3:00
14:00 4:00
15:00 5:00
16:00 6:00
17:00 7:00
18:00 8:00
19:00 9:00
20:00 10:00
21:00 11:00
22:00 12:00
23:00 13:00

Universal Time Coordinated

Offset: UTC is 0 hours ahead Greenwich Mean Time (GMT) and is used in Universal

Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but is used by the scientific community.
UTC is the time standard commonly used across the world since 1972. It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks.

UTC representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
  • +00 - basic short
  • +0000 - basic
  • +00:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates zero hour and zero minutes time differences of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Zulu - Military abbreviation for UTC
  • Z - short form of 'Zulu'
IANA/Olson: Reflects UTC time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Etc/UCT
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UCT
  • UTC
  • Universal
  • Zulu
Time zones with the GMT +0 offset:
  • EGST - Eastern Greenland Summer Time
  • GMT - Greenwich Mean Time
  • WET - Western European Time
  • AZOST - Azores Summer Time
  • UTC - Universal Time Coordinated
  • WT - Western Sahara Standard Time
  • Z - Zulu Time Zone

Hawaii Daylight Time

Offset: HDT is 9 hours behind Greenwich Mean Time (GMT) and is used in Pacific

Countries: It is used in following countries: United States

HDT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -09 - basic short
  • -0900 - basic
  • -09:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0900 - sign character (-) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates nine hour and zero minutes time differences to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Victor - Military abbreviation for HDT
  • V - short form of 'Victor'
IANA/Olson: Reflects HDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Adak
  • America/Atka
  • US/Aleutian
Time zones with the GMT -9 offset:
  • 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