utc now / zones / hst-to-utc

HST to UTC converter

UTC is 10 hours ahead of HST right now. Live clocks on both sides, a direct time input, the full 24-hour table with a permalink per hour, and the real daylight-saving state — computed from the IANA tz database on every request, never from a stored offset.

Hawaii Standard Time · Pacific/Honolulu
14:15:59
Wednesday, 12 August 2026 · HST · UTC-10:00
⇄
Coordinated Universal Time · UTC
00:15:59
Thursday, 13 August 2026 · UTC · UTC+00:00

Convert an exact time type it — no sliders

00:15
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Conversion runs in your browser against the same IANA rules the server uses, so it keeps working offline and nothing you type is sent anywhere.

Daylight saving right now

Coordinated Universal Time

UTC is currently on UTC (UTC+00:00).

no clock change scheduled — this zone is fixed at UTC+00:00

UTC is the reference clock every other offset is quoted against. It has no daylight saving and never shifts.

Hawaii Standard Time

Pacific/Honolulu is on HST (UTC-10:00).

no clock change scheduled — fixed at UTC-10:00

Hawaii Standard Time is UTC-10 all year — Hawaii opted out of daylight saving in 1967, so the offset never moves.

Best time to call green = 09:00–18:00 on both sides

No overlap inside a 09:00–18:00 day on both sides. Someone has to take an early or late slot — the table below shows exactly which hours are least bad.

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HST to UTC, hour by hour 12 August 2026 · every row is a permalink

HST UTC 12-hour Day Permalink
00:00 10:00 UTC 10:00 AM same day 00:00 →
01:00 11:00 UTC 11:00 AM same day 01:00 →
02:00 12:00 UTC 12:00 PM same day 02:00 →
03:00 13:00 UTC 1:00 PM same day 03:00 →
04:00 14:00 UTC 2:00 PM same day 04:00 →
05:00 15:00 UTC 3:00 PM same day 05:00 →
06:00 16:00 UTC 4:00 PM same day 06:00 →
07:00 17:00 UTC 5:00 PM same day 07:00 →
08:00 18:00 UTC 6:00 PM same day 08:00 →
09:00 19:00 UTC 7:00 PM same day 09:00 →
10:00 20:00 UTC 8:00 PM same day 10:00 →
11:00 21:00 UTC 9:00 PM same day 11:00 →
12:00 22:00 UTC 10:00 PM same day 12:00 →
13:00 23:00 UTC 11:00 PM same day 13:00 →
14:00 00:00 UTC 12:00 AM next day 14:00 →
15:00 01:00 UTC 1:00 AM next day 15:00 →
16:00 02:00 UTC 2:00 AM next day 16:00 →
17:00 03:00 UTC 3:00 AM next day 17:00 →
18:00 04:00 UTC 4:00 AM next day 18:00 →
19:00 05:00 UTC 5:00 AM next day 19:00 →
20:00 06:00 UTC 6:00 AM next day 20:00 →
21:00 07:00 UTC 7:00 AM next day 21:00 →
22:00 08:00 UTC 8:00 AM next day 22:00 →
23:00 09:00 UTC 9:00 AM next day 23:00 →

Every hour as its own page

00:00 HST 01:00 HST 02:00 HST 03:00 HST 04:00 HST 05:00 HST 06:00 HST 07:00 HST 08:00 HST 09:00 HST 10:00 HST 11:00 HST 12:00 HST 13:00 HST 14:00 HST 15:00 HST 16:00 HST 17:00 HST 18:00 HST 19:00 HST 20:00 HST 21:00 HST 22:00 HST 23:00 HST

HST to UTC — questions

What time is it in UTC when it is HST now?
UTC is currently 00:15 on Thursday, 13 August 2026 (UTC, UTC+00:00), while HST is 14:15 (UTC-10:00). That is 10 hours ahead of the source clock right now.
How many hours ahead is UTC of HST?
10 hours at this moment. The gap is not constant across the year: Hawaii Standard Time and Coordinated Universal Time change clocks on different dates (or one of them not at all), so a difference you hard-code in summer can be an hour wrong in winter. The table on this page is computed from the current tzdata rules, not from a fixed offset.
Is UTC on daylight saving time right now?
No. UTC is on UTC (UTC+00:00) at the moment.
Does UTC observe daylight saving time?
No. UTC stays on UTC+00:00 all year, so the difference from HST only moves when HST itself changes.
Is there any working-hours overlap between HST and UTC?
Not inside a normal 09:00-18:00 day on both sides — the 10-hour gap is too wide. One party has to take an early or late slot; the hour table above shows exactly which hours land where so you can pick the least painful one.
Which IANA timezone name should I use for UTC in code?
Use UTC. Abbreviations like UTC are ambiguous and not resolvable by most libraries — Python's ZoneInfo, Java's ZoneId, Go's time.LoadLocation and JavaScript's Intl all expect the IANA name. Hard-coding UTC+00:00 instead will be wrong the moment the rules change.

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