Honolulu LondonHST to GMT Time Converter
Honolulu (HST, UTC−10) is currently 10 hours behind London (GMT, UTC±0). Compare live clocks, convert any hour, and find times to meet.
Quick answer
When it's in Honolulu, it's the same day in London.
Honolulu (HST) runs 10 hours behind London (GMT). A 9-to-5 workday on one side lands in the other side's evening or night, so the two cities share almost no normal working hours — edge-of-day calls are the trick.
- Time difference
- +10h 00m
- HST
- UTC−10
- GMT
- UTC±0
- Best call window
- Outside 9–6
HST to GMT conversion table
The next 12 hours in HST and the matching local time in GMT. The current hour is highlighted; drag the converter's slider and the table follows.
| HST | GMT |
|---|---|
| NOW Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Tue, Jun 23 |
Best time to meet between HST & GMT
Working hours are 9am–6pm in each city. The bright band is where they overlap — when both sides are at their desks.
Daylight saving shifts this gap by up to 1 hour
The difference between HST and GMT swings between 10 and 11 hours across the year as each side starts or ends daylight saving. Regions on GMT switch to BST (UTC+1) during daylight saving time. This page always shows the live, DST-aware difference.
Related time zone conversions
Jump straight to another pair — every combination is a live tool, not an article.
From HST
To GMT
One source of truth — for you and your AI
This page exposes the same answer as structured data, so when you ask an assistant "what's 9am HST time in GMT?", it can cite the exact, DST-aware result — not a stale blog post.
- Schema.org JSON-LD on every converter page
- A machine-readable facts island with IANA zones and every possible offset
- Live times in <time datetime> elements with explicit UTC offsets
{
"pair": "HST → GMT",
"url": "https://worldclock.pro/en/convert/hst-to-gmt",
"from": {
"name": "HST",
"type": "timezone",
"abbreviation": "HST",
"daylightAbbreviation": null,
"iana": "Pacific/Honolulu",
"standardUtcOffset": "-10:00",
"daylightUtcOffset": null,
"referenceCity": "Honolulu"
},
"to": {
"name": "GMT",
"type": "timezone",
"abbreviation": "GMT",
"daylightAbbreviation": "BST",
"iana": "Europe/London",
"standardUtcOffset": "+00:00",
"daylightUtcOffset": "+01:00",
"referenceCity": "London"
},
"currentDifferenceMinutes": 600,
"possibleDifferencesMinutes": [
600,
660
],
"note": "Between the regions that use these zones the difference is 10 and 11 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}
Frequently asked questions
What is the time difference between HST and GMT?
HST is currently 10 hours behind GMT. HST is on HST (UTC−10) and GMT is on GMT (UTC±0). The difference can change when either side starts or ends daylight saving time.
Is GMT ahead of or behind HST?
GMT is currently 10 hours ahead of HST.
When it is 9:00 AM in HST, what time is it in GMT?
When it is 9:00 AM on a Monday in HST, it is 7:00 PM in GMT.
Do HST and GMT observe daylight saving time?
HST does not observe daylight saving time. Regions on GMT switch to BST (UTC+1) during daylight saving time.
How do I convert HST time to GMT time?
Add 10 hours to any time in HST to get the time in GMT. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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