Time Zone Converter
Convert any date and time between world time zones. See UTC offsets, daylight saving handled automatically, and compare multiple zones at once.
What is the Time Zone Converter?
The ByteTools Time Zone Converter translates a date and time from one time zone to any number of others.
- Convert between hundreds of IANA time zones
- Common zones pinned to the top of every list
- Automatic daylight saving time handling
- UTC offset shown for source and every target zone
- Day-difference badge when the converted time crosses midnight
- Compare many zones at once — all processed locally
How to use the Time Zone Converter
- 1
Enter the source date and time.
- 2
Choose the time zone that date and time belongs to.
- 3
Pick one or more target zones — click "Add zone" for extra rows.
- 4
Read each converted time with its UTC offset and a +1/−1 day badge when the date changes.
About the Time Zone Converter
The ByteTools Time Zone Converter translates a date and time from one time zone to any number of others. Pick the source moment, choose the zone it belongs to, then add target zones — each row shows the converted local time, its UTC offset, and a badge when the result lands on a different calendar day.
It is built for remote teams scheduling meetings across continents, travellers checking arrival times, and anyone coordinating webinars, releases or calls between cities like New York, London, Karachi, Singapore and Sydney. Daylight saving time is applied automatically from the browser's IANA time zone database.
All conversions run locally using the standard Intl API in your browser — nothing is sent to a server, and the zone list always matches the latest rules your browser ships with.
Frequently asked questions
How does the time zone converter handle daylight saving time?
It uses your browser's built-in IANA time zone database via the Intl API, which knows the exact DST start and end dates for every zone and year. You never need to add or subtract an hour manually — the offset shown is correct for the specific date you choose.
What is the difference between GMT, UTC and a time zone?
UTC is the modern global time standard and GMT is essentially the same offset (UTC+0) used historically. A time zone like America/New_York is a region whose offset from UTC changes with daylight saving — UTC−5 in winter and UTC−4 in summer.
Why does the converted time show a different date?
When the time difference pushes the result past midnight, the target zone is already on the next day or still on the previous one. The converter flags this with a +1 day or −1 day badge so you never schedule a meeting on the wrong date.
Can I convert one time into several time zones at once?
Yes. Click "Add zone" to append as many target rows as you need — useful for publishing a single event time for audiences in Europe, Asia and the Americas simultaneously.
Which time zone names should I use for scheduling?
Prefer IANA names like Europe/London or Asia/Kolkata over abbreviations like EST or IST, which are ambiguous (IST means both Indian and Irish Standard Time). This converter uses IANA names exactly so results are unambiguous.
Guides for Time Zone Converter
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