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HDT
Hawaii Daylight Time
GMT -9
12am
3am
6am
9am
12pm
3pm
6pm
9pm
HDT is not used on this date
This converter keeps HDT at GMT -9. Honolulu uses HST (GMT -10) on this date. Open the HST converter, or choose Honolulu, Pearl City, or Hilo for city-specific time.
W
Whiskey Time Zone
GMT -10
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

HDT is 1 hour ahead of W year-round.

Working hours of 9:00 am to 5:00 pm in HDT correspond to 8:00 am to 4:00 pm in W.

Compare HDT time with W time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Hawaii Daylight Time is 1 hour ahead of Whiskey Time Zone
3:00 am03:00 in HDT is 2:00 am02:00 in W

HDT to W call time
Best time for a conference call or a meeting is between 10am-5pm in HDT which corresponds to 9am-4pm in W

3:00 am03:00 Hawaii Daylight Time (HDT). Offset UTC -9:00 hours
2:00 am02:00 Whiskey Time Zone (W). Offset UTC -10:00 hours

3:00 am03:00 HDT / 2:00 am02:00 W

HDTW
12am (midnight)11pm
1am12am (midnight)
2am1am
3am2am
4am3am
5am4am
6am5am
7am6am
8am7am
9am8am
10am9am
11am10am
12pm (noon)11am
1pm12pm (noon)
2pm1pm
3pm2pm
4pm3pm
5pm4pm
6pm5pm
7pm6pm
8pm7pm
9pm8pm
10pm9pm
11pm10pm
00:0023:00
01:0000:00
02:0001:00
03:0002:00
04:0003:00
05:0004:00
06:0005:00
07:0006:00
08:0007:00
09:0008:00
10:0009:00
11:0010:00
12:0011:00
13:0012:00
14:0013:00
15:0014:00
16:0015:00
17:0016:00
18:0017:00
19:0018:00
20:0019:00
21:0020:00
22:0021:00
23:0022:00

Hawaii Daylight Time

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

Countries using this time zone: 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 an offset of nine hours 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

Whiskey Time Zone

Offset: W is 10 hours behind Greenwich Mean Time (GMT) and is used in Military

Daylight Saving: Clocks in Whiskey Time Zone (W) do not change for daylight saving time, so W stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.

W representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -10 - basic short
  • -1000 - basic
  • -10:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Whiskey - Military abbreviation for W
  • W - short form of 'Whiskey'
Time zones with the GMT -10 offset:
  • HAST - Hawaii-Aleutian Standard Time
  • CKT - Cook Island Time
  • HST - Hawaii Standard Time
  • TAHT - Tahiti Time
  • W - Whiskey Time Zone