Time Zone Calculator
Convert a date and time between any two time zones, with daylight saving time and the difference between them.
Your time
Filled in with example values. Replace them with your own.
Uses the time zone rules built into your browser, including daylight saving time for the date you pick.
Results update as you type.
Result
Almost there
Fill in the remaining fields to see your result.
How the time zone calculator works
Enter a date and time and the time zone they are in, then pick the time zone to convert to. The calculator finds the exact moment in UTC and shows the local time there, the difference between the two places, and the same moment in a few other major cities.
Your own time zone is filled in automatically, from your device.
The method
UTC = local time − offset of the first zone
Converted time = UTC + offset of the second zone
Each offset is the one in force at that moment, from the IANA time zone database.
Worked examples
- 09:00 on July 1, 2026 in New York (UTC−04:00) is 13:00 UTC, so 14:00 in London (UTC+01:00), 18:30 in Kolkata and 22:00 in Tokyo.
- The same 09:00 in New York on January 15 (UTC−05:00) is also 14:00 in London (UTC+00:00): both places are on winter time.
- 23:30 in London on July 1 is 08:30 the next day in Sydney.
Frequently asked questions
Does it handle daylight saving time?
Yes. It uses the time zone database built into your browser, which holds the official rules for each place, including when clocks change. The offset shown is the one in force on the date you pick.
What if the time does not exist or happens twice?
When clocks go forward, an hour is skipped: 02:30 may not exist that night. The calculator tells you and uses the same moment on the new clock. When clocks go back, an hour happens twice; the calculator uses the first one and says so.
Why are some offsets not whole hours?
Some places are 30 or 45 minutes off a whole hour from UTC, such as India (UTC+05:30) and Nepal (UTC+05:45). The calculator handles them like any other.
Why is my city not in the list?
Time zones are named after one city per zone, such as America/New_York for the US Eastern time zone. Pick the city that shares your clock.