Convert Hawaii Standard Time (HST) to Greenwich Mean Time (GMT) instantly. Free, fast and accurate time zone converter with real-time updates.
| HST Time | GMT Time |
|---|---|
| 12:00 AM HST | 10:00 AM GMT |
| 12:30 AM HST | 10:30 AM GMT |
| 1:00 AM HST | 11:00 AM GMT |
| 1:30 AM HST | 11:30 AM GMT |
| 2:00 AM HST | 12:00 PM GMT |
| 2:30 AM HST | 12:30 PM GMT |
| 3:00 AM HST | 1:00 PM GMT |
| 3:30 AM HST | 1:30 PM GMT |
| 4:00 AM HST | 2:00 PM GMT |
| 4:30 AM HST | 2:30 PM GMT |
| 5:00 AM HST | 3:00 PM GMT |
| 5:30 AM HST | 3:30 PM GMT |
| 6:00 AM HST | 4:00 PM GMT |
| 6:30 AM HST | 4:30 PM GMT |
| 7:00 AM HST | 5:00 PM GMT |
| 7:30 AM HST | 5:30 PM GMT |
| 8:00 AM HST | 6:00 PM GMT |
| 8:30 AM HST | 6:30 PM GMT |
| 9:00 AM HST | 7:00 PM GMT |
| 9:30 AM HST | 7:30 PM GMT |
| 10:00 AM HST | 8:00 PM GMT |
| 10:30 AM HST | 8:30 PM GMT |
| 11:00 AM HST | 9:00 PM GMT |
| 11:30 AM HST | 9:30 PM GMT |
| 12:00 PM HST | 10:00 PM GMT |
| 12:30 PM HST | 10:30 PM GMT |
| 1:00 PM HST | 11:00 PM GMT |
| 1:30 PM HST | 11:30 PM GMT |
| 2:00 PM HST | 12:00 AM GMT |
| 2:30 PM HST | 12:30 AM GMT |
| 3:00 PM HST | 1:00 AM GMT |
| 3:30 PM HST | 1:30 AM GMT |
| 4:00 PM HST | 2:00 AM GMT |
| 4:30 PM HST | 2:30 AM GMT |
| 5:00 PM HST | 3:00 AM GMT |
| 5:30 PM HST | 3:30 AM GMT |
| 6:00 PM HST | 4:00 AM GMT |
| 6:30 PM HST | 4:30 AM GMT |
| 7:00 PM HST | 5:00 AM GMT |
| 7:30 PM HST | 5:30 AM GMT |
| 8:00 PM HST | 6:00 AM GMT |
| 8:30 PM HST | 6:30 AM GMT |
| 9:00 PM HST | 7:00 AM GMT |
| 9:30 PM HST | 7:30 AM GMT |
| 10:00 PM HST | 8:00 AM GMT |
| 10:30 PM HST | 8:30 AM GMT |
| 11:00 PM HST | 9:00 AM GMT |
| 11:30 PM HST | 9:30 AM GMT |
Greenwich Mean Time (GMT) is 10 hours ahead of Hawaii Standard Time (HST). When converting from HST to GMT, you need to add 10 hours to get the correct time.
When it's 12:00 PM (noon) in Hawaii Standard Time, it's 10:00 PM in Greenwich Mean Time. This is because GMT is 10 hours ahead of HST.
When it's 12:00 AM (midnight) in Hawaii Standard Time, it's 10:00 AM in Greenwich Mean Time.
Hawaii Standard Time (HST) has a UTC offset of -10:00, while Greenwich Mean Time (GMT) has a UTC offset of +0:00.
Simply add 10 hours to the HST time. For example, 3:00 PM HST becomes 1:00 AM GMT.
The best time depends on both parties' schedules. A common overlap during business hours (9 AM - 5 PM) would be when it's early morning in HST. Use our converter to find the perfect time.
Daylight Saving Time (DST) observance varies by region. Some areas within Hawaii Standard Time and Greenwich Mean Time zones may observe DST, which can temporarily change the time difference by 1 hour.
Hawaii Standard Time (HST) is used by various countries and regions around the world. The UTC offset of -10:00 is shared by multiple time zones.
Greenwich Mean Time (GMT) is used by various countries and regions around the world. With a UTC offset of +0:00, this time zone covers multiple geographic areas.
Yes! Remember that GMT is always 10 hours ahead of HST. If it's noon in HST, it's 10:00 PM in GMT. Bookmark this page for quick reference!
Trading forex? Check our Forex Market Hours tool to see which markets are open right now — live in your local timezone.