Convert GMT to HST — Time Difference Between Greenwich Mean Time and Hawaii Standard Time
Drag the slider or click the time display to type a specific hour and instantly convert GMT to HST — Hawaii Standard Time is 10 hours behind Greenwich Mean Time. Scroll down to browse the full GMT to HST conversion table, check what time 9 AM, 10 AM, 11 AM, or 12 PM in Reykjavik is in Honolulu, and use the date picker to compare times on any day for accurate scheduling.
GMT
Greenwich Mean Time
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HST
Hawaii Standard Time
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GMT to HST Time Zone Difference — Hour-by-Hour Conversion Table
Scan each row to find what time any hour in Reykjavik is in Honolulu — tap the arrows to jump between days, click "Today" to reset, and use the color-coded bands to quickly spot overlapping work hours, early mornings, and late nights at a glance.
| GMT (Reykjavik) | HST (Honolulu) |
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How to Convert GMT to HST
Drag the slider on the GMT timeline to pick your time — the HST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.
What Is the Time Difference Between GMT and HST?
Hawaii Standard Time (HST) is 10 hours behind Greenwich Mean Time (GMT). To convert, subtract 10 hours — for example, 9:00 AM GMT is 11:00 PM (previous day) HST.
What Time Is It Now in Reykjavik?
What Time Is It Now in Honolulu?
GMT to HST Quick Reference
GMT to HST Meeting Planner
Use the color-coded table above to find overlapping work hours between Reykjavik and Honolulu. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.
Why Trust This GMT to HST Converter?
Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.
Greenwich Mean Time
- Abbreviation
- GMT
- UTC Offset
- UTC+0:00
- City
- Reykjavik
- Country
- Iceland
Hawaii Standard Time
- Abbreviation
- HST
- UTC Offset
- UTC-10:00
- City
- Honolulu
- Country
- United States