{ } How to use

Enter a date and time (or pick one).
Choose the source zone it is in, and the zone to convert to.
Select Process to see the converted time and both UTC offsets.

{ } How it works

Time Zone Converter works on the text you provide. Adjust the options, then select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.

Inputs

Date & time — paste or type your input in the left panel (use Sample for an example)
From zone — choose one — UTC, Los Angeles (Pacific), Denver (Mountain), Chicago (Central), New York (Eastern), São Paulo, London, Paris, Berlin, Moscow, Cairo, Dubai, Kolkata (India), Shanghai (China), Singapore, Tokyo, Sydney, Auckland (default: UTC)
To zone — choose one — UTC, Los Angeles (Pacific), Denver (Mountain), Chicago (Central), New York (Eastern), São Paulo, London, Paris, Berlin, Moscow, Cairo, Dubai, Kolkata (India), Shanghai (China), Singapore, Tokyo, Sydney, Auckland (default: New York (Eastern))

Output

TXT text — copy or download it from the Output panel.

{ } Common uses

Work out what time a meeting scheduled in one city falls in another.
Convert a timestamp from a server log in UTC to local time.
Check whether a deadline stated in another zone has passed in yours.

{ } Limitations

The input has to be a date and time in YYYY-MM-DD form, optionally with HH:MM or HH:MM:SS. Unlike the other date tools here, it does not accept Unix timestamps or written-out dates.
Daylight saving is handled by asking the platform for each zone’s offset at that instant, resolved in two passes. That is right for ordinary times, but the hour daylight saving skips does not exist and the hour it repeats is ambiguous, so check any result near a changeover.
The zone list is the IANA database your browser ships with. An unrecognised name is refused rather than guessed at.

{ } FAQ

Is my data uploaded to a server?

No. Everything runs locally in your browser — your files never leave your device.

Can I process more than one file at once?

This tool works on one input at a time.

Is this tool free?

Yes — it’s completely free and needs no sign-up.

Why does it want a full date rather than just a time?

Because a zone’s offset depends on the date. New York is five hours behind UTC in January and four in July, and the only way to know which applies is to know the day. A time on its own cannot be converted correctly.