Don's Tools · Converters · Timezone Converter

Timezone converter

Convert a time across cities and timezones, right in your browser. Nothing is uploaded.

Works offline: times are converted in your browser using its built-in timezone database, so nothing is uploaded. Daylight saving is handled automatically for each zone.
Timezone Converter is a free tool that converts a date and time from one timezone to many others entirely in your browser, with nothing uploaded. Pick the source date, time and zone, add the cities you care about, and see each matching local time with its offset, with daylight saving applied automatically.

Frequently asked questions

Is my data uploaded anywhere?

No. All times are converted in your browser using its own timezone database, so nothing is uploaded and it works offline once loaded.

Does it handle daylight saving time?

Yes. Each zone is converted using the correct offset for that exact date, so daylight saving changes are applied automatically.

How do I compare a meeting time across cities?

Set the date and time and choose the timezone it is in, then add the other cities you care about. Every row shows the matching local time and its offset.

Which timezones are available?

All standard IANA timezones your browser knows, which is several hundred cities and regions, including Asia/Colombo for Sri Lanka.

Why is the time shown with a different day sometimes?

When a zone is far enough ahead or behind, the same moment can fall on a different calendar day, so the date shown reflects the real local date there.