Converters

Time zone converter

Pick a date, a time and a reference zone, then add the zones you want to compare. Each row shows the local time there, its UTC offset and whether daylight saving is in force.

Runs locally in your browser

How it works

The converter takes your date and time in the reference zone, turns it into one moment in time, and formats that moment in every zone you add. Each offset comes from Intl.DateTimeFormat, so it follows the time-zone database built into your browser rather than a table written here. Because that database knows the daylight-saving rules, an offset changes with the date: New York is UTC−5 in January and UTC−4 in July. The UTC offset printed next to each result is the amount added to UTC at that moment. A zone is marked as observing daylight saving when its current offset is larger than the smaller of its January and July offsets. Zones are named by their IANA identifiers, such as Europe/London. Results depend on the database version your browser ships, and nothing is sent anywhere.

Worked example

12:00 on 8 March 2026 in UTC gives 8:00 AM in New York (EDT, UTC−4, because daylight saving started that morning), 12:00 PM in London (GMT, UTC+0) and 9:00 PM in Tokyo (UTC+9). The same date in January would give 7:00 AM in New York, because the offset there is UTC−5 then.

Questions and answers

Everything runs in your browser: your text, file or value is never uploaded anywhere.