Time Zone Converter
Convert a time between time zones, daylight saving included.
Use via API
Convert a wall-clock date and time in one IANA time zone to other zones, DST-aware, with offsets and day shifts. Send JSON, get JSON back.
POST https://pithlab.com/api/v1/tools/time-zone-converter
curl https://pithlab.com/api/v1/tools/time-zone-converter \
-H "Authorization: Bearer $PITHLAB_KEY" \
-H "Content-Type: application/json" \
-d '{"dateTime":"2026-10-20T09:00","from":"America/New_York","to":"Europe/London,Asia/Tokyo"}'About the Time Zone Converter
Convert a date and time between any IANA time zones, with UTC offsets and daylight saving handled automatically. Compare several cities at once.
How to use the Time Zone Converter
- Pick the date and time, and the time zone it is in. Both start at your current time and zone.
- Add the time zones you want to compare, and remove any you don't need.
- Each row shows the converted date, time and UTC offset, and notes when the date falls on the previous or next day.
Examples
Input
2024-07-01 12:00 America/New_York → Europe/London, Asia/Tokyo
Output
2024-07-01 17:00 Europe/London (UTC+01:00); 2024-07-02 01:00 Asia/Tokyo (UTC+09:00)
Input
2024-01-15 12:00 America/New_York → Europe/London, Australia/Sydney
Output
2024-01-15 17:00 Europe/London (UTC+00:00); 2024-01-16 04:00 Australia/Sydney (UTC+11:00)
Input
2024-03-01 09:00 Asia/Kolkata → UTC
Output
2024-03-01 03:30 UTC (UTC+00:00)
Frequently asked questions
Does it handle daylight saving time?
Yes. Offsets come from your browser's built-in time zone database for the exact date you pick, so New York is UTC-05:00 in January and UTC-04:00 in July, and the southern hemisphere's opposite seasons are handled too.
What happens to a time that doesn't exist because the clocks went forward?
On the night clocks spring forward, times like 02:30 are skipped. The converter moves such a time forward by the length of the gap and shows a note. For a repeated hour when clocks go back, the first occurrence is used.
Why use names like Europe/London instead of GMT or BST?
IANA zone names follow a place's full history of offset and daylight saving rules, while abbreviations are ambiguous (CST is used in the US, China and Cuba) and change with the seasons.