Time Zone Converter
Convert a date and time between cities or IANA time zones. See local dates and UTC offsets with daylight saving time applied for your chosen date.
Your converted local date and time will appear here.
How to use this calculator
- Choose a source location and enter the date and local time there.
- Choose the destination location, then select Convert. Read both the time and date in the result.
How it works
The converter matches a source wall-clock time to an instant, then displays that instant in the destination. Cities map to IANA time zones such as America/New_York and Europe/London. Offsets and daylight saving time use your browser’s time-zone rules for the selected date, rather than a fixed difference between cities.
Example
September 26, 2026 at 09:00 in New York is 14:00 in London. At 20:00 in New York, it is already the next day in Tokyo.
New York 20:00 on September 26 → Tokyo 09:00 on September 27, 2026.
Common questions
What happens when a local time occurs twice?
When clocks move back, a local time can refer to two instants. Choose Earlier occurrence or Later occurrence to identify the one you mean; the converter asks you to choose if needed.
What if a local time does not exist?
During a forward clock change, some local times are skipped. The converter rejects that time so you can select a valid time before or after the gap.
Is the difference between London and New York always five hours?
No. Their daylight-saving transitions occur on different dates. Enter the actual travel or meeting date to calculate the applicable offset.