Time zone converter: turn a time in one zone into local time in up to 12 others, with daylight-saving changes applied and a meeting planner grid.
By AdminDrafted with AI writing toolsUpdated Checked examples: 4
09:00 on Thu 12 Nov 2026 in UTC is London 09:00 · New York 04:00 · India (Kolkata) 14:30 · Tokyo 18:00. Offsets come from the IANA database, so daylight-saving time on that date is already applied.
| UTC (from) | London | New York | India (Kolkata) | Tokyo | In working hours | Note |
|---|---|---|---|---|---|---|
| 00:00 | 00:00 | 19:00 (−1 day) | 05:30 | 09:00 | 1 of 5 | |
| 01:00 | 01:00 | 20:00 (−1 day) | 06:30 | 10:00 | 1 of 5 | |
| 02:00 | 02:00 | 21:00 (−1 day) | 07:30 | 11:00 | 1 of 5 | |
| 03:00 | 03:00 | 22:00 (−1 day) | 08:30 | 12:00 | 1 of 5 | |
| 04:00 | 04:00 | 23:00 (−1 day) | 09:30 | 13:00 | 2 of 5 | |
| 05:00 | 05:00 | 00:00 | 10:30 | 14:00 | 2 of 5 | |
| 06:00 | 06:00 | 01:00 | 11:30 | 15:00 | 2 of 5 | |
| 07:00 | 07:00 | 02:00 | 12:30 | 16:00 | 2 of 5 | |
| 08:00 | 08:00 | 03:00 | 13:30 | 17:00 | 1 of 5 | |
| 09:00 | 09:00 | 04:00 | 14:30 | 18:00 | 3 of 5 | Selected hour |
| 10:00 | 10:00 | 05:00 | 15:30 | 19:00 | 3 of 5 | |
| 11:00 | 11:00 | 06:00 | 16:30 | 20:00 | 3 of 5 | |
| 12:00 | 12:00 | 07:00 | 17:30 | 21:00 | 2 of 5 | |
| 13:00 | 13:00 | 08:00 | 18:30 | 22:00 | 2 of 5 | |
| 14:00 | 14:00 | 09:00 | 19:30 | 23:00 | 3 of 5 | |
| 15:00 | 15:00 | 10:00 | 20:30 | 00:00 (+1 day) | 3 of 5 | |
| 16:00 | 16:00 | 11:00 | 21:30 | 01:00 (+1 day) | 3 of 5 | |
| 17:00 | 17:00 | 12:00 | 22:30 | 02:00 (+1 day) | 1 of 5 | |
| 18:00 | 18:00 | 13:00 | 23:30 | 03:00 (+1 day) | 1 of 5 | |
| 19:00 | 19:00 | 14:00 | 00:30 (+1 day) | 04:00 (+1 day) | 1 of 5 | |
| 20:00 | 20:00 | 15:00 | 01:30 (+1 day) | 05:00 (+1 day) | 1 of 5 | |
| 21:00 | 21:00 | 16:00 | 02:30 (+1 day) | 06:00 (+1 day) | 1 of 5 | |
| 22:00 | 22:00 | 17:00 | 03:30 (+1 day) | 07:00 (+1 day) | 0 of 5 | |
| 23:00 | 23:00 | 18:00 | 04:30 (+1 day) | 08:00 (+1 day) | 0 of 5 |
09:00 on Thu 12 Nov 2026 in UTC is UTC+00:00, so the instant is 2026-11-12T09:00:00Z.
UTC+00:00 → 09:00 on Thu 12 Nov 2026.
UTC−05:00 → 04:00 on Thu 12 Nov 2026.
UTC+05:30 → 14:30 on Thu 12 Nov 2026.
UTC+09:00 → 18:00 on Thu 12 Nov 2026.
The converter reads the wall-clock time you enter in the source zone, subtracts that zone's UTC offset on that date to get a single instant, then adds each target zone's offset at the same instant. Offsets come from the IANA time zone database, so daylight-saving time is applied for the date you pick rather than for today.
The first worked example, 09:00 in New York on 15 January 2026, is 14:00 in London, 19:30 in India and 23:00 in Tokyo. The grid below the result shows all 24 hours of the source day in every zone, green where it falls inside Monday-to-Friday working hours (09:00 to 17:00 unless you change them), so a shared meeting slot is visible at a glance.
Some wall-clock times do not exist or happen twice. On 8 March 2026, 02:30 never occurs in New York and is read as 03:30; on 1 November 2026, 01:30 occurs twice and the first occurrence is used unless you choose the second.
Turn the source time into UTC by subtracting its zone's offset on that date, then add each target zone's offset. 15:00 in London on 20 July 2026 is 14:00 UTC, because London is on UTC+01:00 in summer, which makes it 10:00 in New York (UTC−04:00), 19:30 in India (UTC+05:30) and 23:00 in Tokyo (UTC+09:00).
Always convert with the date. Offsets change with daylight saving time, and countries change their clocks on different dates, so the gap between two cities can change during the year.
09:00 in New York on six dates in 2026:
| Source date | New York | UTC | London | India |
|---|---|---|---|---|
| 2026-01-15 | 09:00 | 14:00 | 14:00 | 19:30 |
| 2026-03-15 | 09:00 | 13:00 | 13:00 | 18:30 |
| 2026-03-30 | 09:00 | 13:00 | 14:00 | 18:30 |
| 2026-07-01 | 09:00 | 13:00 | 14:00 | 18:30 |
| 2026-10-26 | 09:00 | 13:00 | 13:00 | 18:30 |
| 2026-11-02 | 09:00 | 14:00 | 14:00 | 19:30 |
New York changes its clocks on 8 March and 1 November 2026, London on 29 March and 25 October. In the weeks between, the two cities are 4 hours apart instead of 5.
India has no daylight saving time, so it is 10 hours 30 minutes ahead of New York in winter and 9 hours 30 minutes ahead in summer.
A conversion that crosses midnight changes the date as well: 09:00 in New York on 15 January is 23:00 the same day in Tokyo, but 18:00 in New York is 08:00 the next morning there.
On the day clocks go forward, an hour of local times never happens; on the day they go back, an hour happens twice.
| Source zone | Entered wall clock | Choice | Resulting UTC | Status |
|---|---|---|---|---|
| America/New_York | 2026-03-08 02:30 | earlier | 2026-03-08T07:30:00Z | Skipped by a DST change |
| America/New_York | 2026-03-08 02:30 | later | 2026-03-08T07:30:00Z | Skipped by a DST change |
| America/New_York | 2026-11-01 01:30 | earlier | 2026-11-01T05:30:00Z | Occurs twice (DST overlap) |
| America/New_York | 2026-11-01 01:30 | later | 2026-11-01T06:30:00Z | Occurs twice (DST overlap) |
| Europe/London | 2026-03-29 01:30 | earlier | 2026-03-29T01:30:00Z | Skipped by a DST change |
| Europe/London | 2026-03-29 01:30 | later | 2026-03-29T01:30:00Z | Skipped by a DST change |
| Europe/London | 2026-10-25 01:30 | earlier | 2026-10-25T00:30:00Z | Occurs twice (DST overlap) |
| Europe/London | 2026-10-25 01:30 | later | 2026-10-25T01:30:00Z | Occurs twice (DST overlap) |
A skipped time is read as the time it would be after the jump, so 02:30 on 8 March 2026 in New York becomes 03:30 EDT, 07:30 UTC, whichever occurrence you choose. A repeated time has two instants an hour apart, and you choose the first or the second.
NIST's 2026 DST rules give 8 March and 1 November for US regions that observe daylight saving time, and GOV.UK gives 29 March and 25 October for the UK. Many countries, and Arizona and Hawaii in the US, don't change their clocks at all.
Compare working hours on the meeting's actual date, in each person's local time. London and India share 2.5 hours of a 09:00 to 17:00 day in winter, 09:00 to 11:30 in London, and 3.5 hours during British Summer Time, 09:00 to 12:30, because India's clocks don't change.
The hours calculator works out the overlap once you have each person's local day, and the time duration calculator adds or subtracts hours from a start time. A recurring meeting fixed in one city's time moves for everyone else when either side changes its clocks. Check the weeks around each change before sending a series, and give each invitee the converted date as well as the time.
Europe/Paris or a listed city, up to 12 targets separated by commas, semicolons or new lines.Etc/GMT+5 have inverted signs: Etc/GMT+5 is UTC−05:00, and it never changes for daylight saving time.Offsets come from the IANA time zone database, and governments change their rules, sometimes at short notice.
Release 2026e records Manitoba's move to permanent UTC−05:00: after its last clock change on 8 March 2026, Winnipeg stays 5 hours behind UTC instead of moving back to UTC−06:00 in November (IANA 2026e).
Checked against: Independent calculation
Checked against: resolve_imaginary gives 03:30 EDT = 07:30Z
Checked against: fold=1 gives 01:30 EST = 06:30Z (fold=0 gives 05:30Z)
Checked against: Independent calculation
On a clock they read the same, but UTC is an atomic time scale and GMT is a time zone. UTC is derived from International Atomic Time and kept within 0.9 seconds of the Earth's rotation by leap seconds; 27 have been added since 1972, the last on 31 December 2016. GMT is the UK's winter civil time; from late March to late October the UK uses BST, which is UTC+01:00.
In US regions that observe daylight saving time, clocks go forward at 02:00 local time on the second Sunday in March and back on the first Sunday in November, the rule since 2007: 8 March and 1 November in 2026. The EU and UK change at 01:00 UTC on the last Sunday in March and October: 29 March and 25 October. Between 8 and 29 March, New York is 4 hours behind London instead of 5.
An IANA name carries the zone's full history of offset and daylight-saving rules; an abbreviation is one fixed offset and is often ambiguous. EST means UTC−05:00, which is wrong for New York from March to November, when it is on EDT (UTC−04:00). IST can mean India (UTC+05:30), Irish or Israel Standard Time, and CST is both US Central and China Standard Time.
India uses UTC+05:30 all year, Iran UTC+03:30, Afghanistan UTC+04:30 and Myanmar UTC+06:30. Nepal is at UTC+05:45 and the Chatham Islands at UTC+12:45, or UTC+13:45 in the southern summer. Newfoundland is at UTC−03:30 in winter and South Australia at UTC+09:30 in winter, and both move by an hour for daylight saving.
Three hours for most of the year: 09:00 to 17:00 in New York is 14:00 to 22:00 in London, so the shared window is 14:00 to 17:00 London time. It widens to four hours in the weeks when only the US has changed its clocks, such as 8 to 29 March 2026. Tokyo's 09:00 to 17:00 does not overlap either city's working day.
This calculator includes 4 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.