Where does the time zone data come from?

From your browser's built-in Intl API, which includes the IANA time zone database — the same reference data source used by most operating systems, browsers and programming languages, kept up to date by browser vendors.

Can I convert a time in the past or future?

Yes — enter any date, not just today. This matters for daylight saving time in particular, since the correct offset depends on whether that specific date falls inside or outside DST for each zone.

Time Zone Converter

Convert a date and time from one time zone to another, with daylight saving time handled automatically for both zones.

Date and time

Filter timezones

From

Everything you enter is processed in your browser and isn't sent to our servers.

How to use time zone converter

1Enter the date and time you want to convert.
2Search or select the source time zone.
3Search or select the destination time zone.
4Read the converted time, or use the swap button to reverse direction.

About this tool

Converting between time zones isn't just adding or subtracting a fixed number of hours — many regions observe daylight saving time, which shifts their offset from UTC for part of the year, and a handful of places use unusual offsets that aren't whole hours (like India's UTC+5:30). Getting this right means using accurate, current timezone rules for the specific date involved, not a static hour difference.

This tool uses your browser's built-in Intl API, which already contains the full IANA timezone database — the same data source used by most operating systems and programming languages. That means conversions are automatically correct for daylight saving time on both ends, for the specific date you choose, without this site needing to fetch or maintain timezone data itself.

Because everything runs through your browser's own timezone data, results are as accurate and up to date as your browser and operating system are.

Frequently asked questions

Yes, automatically, for both the source and destination time zone, based on the specific date you enter — not just today's offset. This matters because two zones can be a different number of hours apart in summer than in winter.

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