No servers
Inputs remain on your device.
Time Zone Converter
Convert local date and time between IANA zones with browser DST rules.
Calculations happen locally; dates and time zones are not transmitted.
How to use the time zone converter
- 1
Enter the required dates, times or options.
- 2
Select Calculate to run the operation locally.
- 3
Review and copy each format or print the result.
Calendar accuracy in your browser
Explicit rules
Validates ranges, leap years and month changes.
International formats
Uses Intl and IANA to localize results.
Frequently asked questions
How are time zones converted?
The browser Intl API applies IANA time-zone rules, including historical daylight-saving offsets.
Are my dates sent to a server?
No. Every operation runs in your browser.
Which calendar is used?
It uses the Gregorian calendar and dates from years 1 through 9999.