Time zone converter

Pick a date and time, the zone it is in, and the zone you want. The converter uses your browser’s built-in time zone database, so daylight saving changes are applied for the exact date you choose.

How the conversion works

Every time zone is an offset from Coordinated Universal Time (UTC), such as UTC+04:00 for Dubai. Many zones also change their offset for daylight saving time (DST) part of the year. The converter first works out the exact moment your time represents in UTC, using the offset that applied in the "from" zone on that date, then shows that moment in the "to" zone using its offset on that date.

Zones use the standard IANA names such as Asia/Dubai, Europe/London or America/New_York. A city name is used rather than an abbreviation like "EST", because abbreviations are ambiguous and do not tell you when the clocks change.

Worked examples

09:00 on 1 July 2026 in Dubai (UTC+04:00) is 06:00 in London, which is on British Summer Time (UTC+01:00), and 01:00 in New York (UTC−04:00).
09:00 on 1 December 2026 in Dubai is 05:00 in London (UTC+00:00) and 00:00 in New York (UTC−05:00). The UAE does not use daylight saving, so the gap to London changes from 3 to 4 hours during the year.

Daylight saving edge cases

When clocks go forward, one hour of local time is skipped. If you enter a time in that missing hour (for example 01:30 in London on the last Sunday of March), the converter moves it forward by the size of the jump, so it is read as 02:30 summer time.

When clocks go back, one hour happens twice. For a time in that repeated hour (for example 01:30 in London on the last Sunday of October), the converter uses the first occurrence, which is still on summer time.

Different regions change on different dates. The UK and EU change on the last Sunday of March and October; the US and Canada on the second Sunday of March and the first Sunday of November. So for a few weeks each year, the gap between London and New York is 4 hours instead of 5.

FAQ

Where does the time zone data come from?

From your browser and operating system, which ship the IANA time zone database. Keep them up to date: if a government changes its rules at short notice, results can be wrong until your device gets the update.

Why are some offsets not whole hours?

Some zones use half or quarter hours, for example India at UTC+05:30 and Nepal at UTC+05:45.

Is GMT the same as UTC?

For everyday use they show the same time. "GMT" is also used loosely for UK winter time; in summer the UK is on BST, one hour ahead.