HST
Hawaii Standard Time
GMT -10
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Y
Yankee Time Zone
GMT -12
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

HST is 2 hours ahead of Y. HST uses GMT -10, and Y uses GMT -12 for this comparison.

For example, 2:00 am HST is 12:00 am Y. Use the converter above to adjust the date or time and create a shareable meeting link.

Best meeting overlap: 11am-5pm HST, which is 9am-3pm Y.

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

Time Difference

Hawaii Standard Time is 2 hours ahead of Yankee Time Zone
2:00 am02:00 in HST is 12:00 am00:00 in Y

HST to Y call time
Best time for a conference call or a meeting is between 11am-5pm in HST which corresponds to 9am-3pm in Y

2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours
12:00 am00:00 Yankee Time Zone (Y). Offset UTC -12:00 hours

2:00 am02:00 HST / 12:00 am00:00 Y

HSTY
12am (midnight)10pm
1am11pm
2am12am (midnight)
3am1am
4am2am
5am3am
6am4am
7am5am
8am6am
9am7am
10am8am
11am9am
12pm (noon)10am
1pm11am
2pm12pm (noon)
3pm1pm
4pm2pm
5pm3pm
6pm4pm
7pm5pm
8pm6pm
9pm7pm
10pm8pm
11pm9pm
00:0022:00
01:0023:00
02:0000:00
03:0001:00
04:0002:00
05:0003:00
06:0004:00
07:0005:00
08:0006:00
09:0007:00
10:0008:00
11:0009:00
12:0010:00
13:0011:00
14:0012:00
15:0013:00
16:0014:00
17:0015:00
18:0016:00
19:0017:00
20:0018:00
21:0019:00
22:0020:00
23:0021:00

Hawaii Standard Time

Offset: HST is 10 hours behind Greenwich Mean Time (GMT) and is used in Pacific

Countries using this time zone: United States

Principal Cities: The largest city in the HST time zone is Honolulu in the United States, with about 371,657 people. Other major cities in this time zone include Pearl City, Hilo, Kailua, Waipahu.

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

HST Time Zone Geo Map
HST timezone map

HST 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 HST
  • W - short form of 'Whiskey'
IANA/Olson: Reflects HST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Adak
  • America/Atka
  • HST
  • Pacific/Honolulu
  • Pacific/Johnston
  • US/Aleutian
  • US/Hawaii
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

Yankee Time Zone

Offset: Y is 12 hours behind Greenwich Mean Time (GMT) and is used in Military

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

Y representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -12 - basic short
  • -1200 - basic
  • -12:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -1200 - sign character (-) followed by a four digit time providing hours (12) and minutes (00) of the offset. Indicates an offset of twelve hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Yankee - Military abbreviation for Y
  • Y - short form of 'Yankee'