utc now / zones / jst-to-utc

JST to UTC converter

UTC is 9 hours behind JST 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.

Japan Standard Time · Asia/Tokyo
09:26:11
Thursday, 13 August 2026 · JST · UTC+09:00
⇄
Coordinated Universal Time · UTC
00:26:11
Thursday, 13 August 2026 · UTC · UTC+00:00

Convert an exact time type it — no sliders

00:26
swap

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.

Japan Standard Time

Asia/Tokyo is on JST (UTC+09:00).

no clock change scheduled — fixed at UTC+09:00

Japan Standard Time is UTC+9 with no daylight saving — Japan has not observed DST since 1951, so the offset is safe to hard-code.

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.

Google Calendar Outlook download .ics

JST to UTC, hour by hour 13 August 2026 · every row is a permalink

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

Every hour as its own page

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

JST to UTC — questions

What time is it in UTC when it is JST now?
UTC is currently 00:26 on Thursday, 13 August 2026 (UTC, UTC+00:00), while JST is 09:26 (UTC+09:00). That is 9 hours behind the source clock right now.
How many hours behind is UTC of JST?
9 hours at this moment. The gap is not constant across the year: Japan 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 JST only moves when JST itself changes.
Is there any working-hours overlap between JST and UTC?
Not inside a normal 09:00-18:00 day on both sides — the 9-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.

Keyboard shortcuts

cCopy the ISO 8601 timestamp
uCopy the Unix timestamp
/Focus the timezone search
tToggle light and dark
?This help
EscClose