Time Zone Calculator
This time zone calculator converts a date and 24-hour time from one selected time zone to another. It supports UTC plus major city zones including New York, Los Angeles, Chicago, London, Paris, Tokyo, Shanghai, Dubai, Sydney, and Auckland. Results include the converted time, converted date, time difference, and daylight saving status for both zones.
How to use this calculator
Select the source time zone, enter the time as HH:mm, choose the date, and select the target time zone. The date matters because daylight saving rules change during the year and not all regions switch on the same day. For elapsed time after converting, use the time duration calculator.
How it works
The calculator treats the entered local date and time as an instant in the source zone, then formats that same instant in the target zone.
The offset difference is calculated from the two zones on the selected date, not from a fixed abbreviation. That helps avoid errors around daylight saving transitions.
Worked example
If you enter 09:00 in America/New_York for June 15 and convert to Europe/London, the result is typically 14:00 on the same date. In winter, the difference may still be five hours, but transition weeks can differ, so the date-specific calculation matters.
Planning across zones
Include the day of week when scheduling meetings. If you are building a work schedule after conversion, the shift calculator and time card calculator can help turn the converted time into hours worked.