Convert time from GMT to HST. Enter any time to see the equivalent HST time, compare current GMT and HST times side by side, and find overlapping business hours for calls and meetings.
Use this GMT to HST converter to compare United Kingdom and United States time, check the 10 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.
Converting between Greenwich Mean Time and Hawaii Standard 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 Greenwich Mean Time (UTC +0) that you want to convert. Hit "Now" to load the current gmt time instantly, or use "+1h" to step forward and compare.
The equivalent Hawaii Standard Time (UTC -10) time appears immediately. Since hst is 10 hours behind of gmt, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the hst result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring United Kingdom–United States calls.
With 10 hours between gmt and hst, 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 gmt times can land on a different date in hst 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 gmt–hst 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 gmt. Convert the event time to hst so you know exactly when to tune in — with a 10 hours difference, a morning event in United Kingdom hits the evening in United States.
Quick-reference conversion table covering every hour of the day at a glance.
Greenwich Mean Time to Hawaii Standard Time full day schedule
| Greenwich Mean Time | Hawaii Standard Time |
|---|---|
| 12:00 AM |
2:00 PM
(previous day)
|
| 1:00 AM |
3:00 PM
(previous day)
|
| 2:00 AM |
4:00 PM
(previous day)
|
| 3:00 AM |
5:00 PM
(previous day)
|
| 4:00 AM |
6:00 PM
(previous day)
|
| 5:00 AM |
7:00 PM
(previous day)
|
| 6:00 AM |
8:00 PM
(previous day)
|
| 7:00 AM |
9:00 PM
(previous day)
|
| 8:00 AM |
10:00 PM
(previous day)
|
| 9:00 AM |
11:00 PM
(previous day)
|
| 10:00 AM |
12:00 AM
|
| 11:00 AM |
1:00 AM
|
| 12:00 PM |
2:00 AM
|
| 1:00 PM |
3:00 AM
|
| 2:00 PM |
4:00 AM
|
| 3:00 PM |
5:00 AM
|
| 4:00 PM |
6:00 AM
|
| 5:00 PM |
7:00 AM
|
| 6:00 PM |
8:00 AM
|
| 7:00 PM |
9:00 AM
|
| 8:00 PM |
10:00 AM
|
| 9:00 PM |
11:00 AM
|
| 10:00 PM |
12:00 PM
|
| 11:00 PM |
1:00 PM
|
UK / Ireland / Iceland / Portugal / West Africa. Business hours 9 AM – 5:30 PM GMT typically. Note: London is on GMT in winter, BST (GMT+1) in summer — but "GMT" gets used loosely all year in scheduling contexts. Financial-services London anchors the European trading day.
Explore more gmt conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Find the time difference from any major zone into Hawaii Standard Time. Use these pages when scheduling with United States from a different region.
