Timezone Converter
Convert a date and time between any world timezones at once.
Unix: 1785772860
ISO: 2026-08-03T16:01:00.000Z
Same moment in 4 zones
UTC source
UTC · UTC+00:00
16:01
2026-08-03
New York
America/New_York · UTC-04:00
12:01
2026-08-03
London
Europe/London · UTC+01:00
17:01
2026-08-03
Singapore
Asia/Singapore · UTC+08:00
00:01 +1d
2026-08-04
About the Timezone Converter
Pick a date and time in one timezone and see the same instant in every other zone at once. Daylight saving transitions, half-hour offsets and day rollovers are all handled for you, which is exactly where mental arithmetic goes wrong when scheduling across regions.
How to use it
- 1 Choose the source timezone — it starts on the one your computer reports.
- 2 Set the date and time you want to convert, or click Now.
- 3 Read the same instant across every zone in the list.
- 4 Add or remove zones to build the set you actually care about.
What it does
- Convert one instant across many zones simultaneously
- Full IANA timezone database, kept current by your browser
- Correct daylight saving handling in both hemispheres
- Half-hour and quarter-hour offsets such as India and Nepal
- Next-day and previous-day indicators
- Unix timestamp and ISO 8601 output
Frequently asked questions
Is my input sent anywhere?
No. Every calculation happens locally in your browser using JavaScript. Nothing you paste is uploaded, logged, or stored on a server, which makes the tool safe to use with production data, credentials, and customer records.
Does it handle daylight saving time?
Yes. Conversions use the IANA timezone database that ships with your browser, so a time in July converts with summer rules and the same wall-clock time in January converts with winter rules. This matters most when scheduling a recurring meeting across a DST boundary, where the gap between two cities changes by an hour partway through the year.
Why does the tool ask for a city rather than something like GMT+7?
A fixed offset cannot express daylight saving. "Europe/London" is +00:00 in winter and +01:00 in summer, so storing the city keeps future dates correct while storing "GMT+0" would silently drift. This is the same reason you should store IANA zone names rather than offsets in a database.
What does the +1d marker mean?
That zone is already on the following calendar day at that instant. It appears whenever the time difference pushes across midnight — the usual surprise when scheduling between, say, California and Singapore.
Which timezones are available?
Every zone in the IANA database your browser knows about, typically more than 400. If your browser does not expose the full list, the tool falls back to a curated set covering the major business regions.