HST to GMT Time Converter
Use this HST to GMT time converter to compare United States and United Kingdom time instantly. GMT is 10 hours ahead of HST, so 9:00 AM HST becomes 7:00 PM GMT and 5:00 PM HST becomes 3:00 AM (next day) GMT. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
HST to GMT Quick Facts
Use this HST to GMT converter to compare United States and United Kingdom time, check the 10 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.
How to Convert HST to GMT
Converting between Hawaii Standard Time and Greenwich Mean Time means accounting for a 10 hours gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Hawaii Standard Time (UTC -10) that you want to convert. Hit "Now" to load the current HST time instantly, or use "+1h" to step forward and compare.
The equivalent Greenwich Mean Time (UTC +0) time appears immediately. Since GMT is 10 hours ahead of HST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the GMT result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring United States–Universal calls.
Why Choose Our HST to GMT Converter
With 10 hours between HST and GMT, business-hours overlap is limited. This tool instantly shows which hours work on both sides, so you can lock in a meeting without a chain of "does 3 PM work for you?" emails.
Late-night HST times can land on a different date in GMT because of the 10 hours offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the HST–GMT gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in HST. Convert the event time to GMT so you know exactly when to tune in — with a 10 hours difference, a morning event in United States falls during work hours in Universal.
HST to GMT Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Hawaii Standard Time to Greenwich Mean Time full day schedule
| Hawaii Standard Time | Greenwich Mean Time |
|---|---|
| 12:00 AM |
10:00 AM
|
| 1:00 AM |
11:00 AM
|
| 2:00 AM |
12:00 PM
|
| 3:00 AM |
1:00 PM
|
| 4:00 AM |
2:00 PM
|
| 5:00 AM |
3:00 PM
|
| 6:00 AM |
4:00 PM
|
| 7:00 AM |
5:00 PM
|
| 8:00 AM |
6:00 PM
|
| 9:00 AM |
7:00 PM
|
| 10:00 AM |
8:00 PM
|
| 11:00 AM |
9:00 PM
|
| 12:00 PM |
10:00 PM
|
| 1:00 PM |
11:00 PM
|
| 2:00 PM |
12:00 AM
(next day)
|
| 3:00 PM |
1:00 AM
(next day)
|
| 4:00 PM |
2:00 AM
(next day)
|
| 5:00 PM |
3:00 AM
(next day)
|
| 6:00 PM |
4:00 AM
(next day)
|
| 7:00 PM |
5:00 AM
(next day)
|
| 8:00 PM |
6:00 AM
(next day)
|
| 9:00 PM |
7:00 AM
(next day)
|
| 10:00 PM |
8:00 AM
(next day)
|
| 11:00 PM |
9:00 AM
(next day)
|
Popular HST Time Converters
Explore more HST conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Convert Other Time Zones to GMT
Find the time difference from any major zone into Greenwich Mean Time. Use these pages when scheduling with Universal from a different region.