TimeToZone

GMT to HST Converter

HST is 10 hours behind GMT. 9:00 AM GMT = 11:00 PM HST (previous day).

⇄ Swap
GMTfrom
Greenwich Mean Time
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HST
Hawaii-Aleutian Standard Time
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HST is 10 hours behind GMT. To convert GMT to HST, subtract 10 hours from the GMT time: 9:00 AM GMT = 11:00 PM HST (previous day).

GMT (GMT) is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year. HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time).

The UK is on GMT only in winter; in summer it uses BST (UTC+1).

GMT to HST time conversion table

GMT to HST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

GMTHSTDay
12:00 AM GMT2:00 PM HSTprevious day
1:00 AM GMT3:00 PM HSTprevious day
2:00 AM GMT4:00 PM HSTprevious day
3:00 AM GMT5:00 PM HSTprevious day
4:00 AM GMT6:00 PM HSTprevious day
5:00 AM GMT7:00 PM HSTprevious day
6:00 AM GMT8:00 PM HSTprevious day
7:00 AM GMT9:00 PM HSTprevious day
8:00 AM GMT10:00 PM HSTprevious day
9:00 AM GMT11:00 PM HSTprevious day
10:00 AM GMT12:00 AM HSTnight
11:00 AM GMT1:00 AM HSTnight
12:00 PM GMT2:00 AM HSTnight
1:00 PM GMT3:00 AM HSTnight
2:00 PM GMT4:00 AM HSTnight
3:00 PM GMT5:00 AM HSTnight
4:00 PM GMT6:00 AM HST—
5:00 PM GMT7:00 AM HST—
6:00 PM GMT8:00 AM HST—
7:00 PM GMT9:00 AM HST—
8:00 PM GMT10:00 AM HST—
9:00 PM GMT11:00 AM HST—
10:00 PM GMT12:00 PM HST—
11:00 PM GMT1:00 PM HST—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert GMT to HST

Subtract 10 hours from the GMT time to get HST.

Example: 9:00 AM GMT = 11:00 PM HST (previous day).

Across midnight: 1:00 AM GMT = 3:00 PM HST (previous day). The date changes, so always check the day as well as the hour.

Time difference between GMT and HST

The time difference between GMT and HST is 10 hours all year – HST is behind GMT.

GMT and HST during daylight saving time

  • GMT does not observe daylight saving time; it stays on UTC+0 all year.
  • HST does not observe daylight saving time; it stays on UTC−10 all year.

Best time for a meeting between GMT and HST

GMT and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM GMT, which is 9:00 PM HST.

Plan a meeting across more time zones.

GMT to HST FAQ

What is the time difference between GMT and HST?

HST is 10 hours behind GMT all year. 9:00 AM GMT = 11:00 PM HST (previous day).

What is 9 AM GMT in HST?

9:00 AM GMT is 11:00 PM HST (previous day).

What is 12 PM (noon) GMT in HST?

12:00 PM GMT is 2:00 AM HST.

Is HST ahead of or behind GMT?

HST is 10 hours behind GMT, so it is earlier in HST than in GMT.

Does GMT change for daylight saving time?

No. GMT stays on the same offset all year, so conversions never shift for daylight saving time.

Does HST change for daylight saving time?

No. HST stays on the same offset all year, so conversions never shift for daylight saving time.

What is the best time for a meeting between GMT and HST?

GMT and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM GMT, which is 9:00 PM HST.

Related conversions

Convert HST to GMT

Convert GMT to other time zones

Convert other time zones to HST

Learn more

Updated 6 November 2026. Time zone data: IANA tz database.