Understand the result
How to use the time zone converter
Convert one local date and time between selected world time zones while accounting for the chosen date.
Formula or method
The browser applies IANA time-zone rules to the entered local time and formats the same instant in the destination zone.
Worked examples
New York to London meeting
Convert 9:00 AM in New York on the meeting date to London time; the offset can differ between March and November.
Karachi to Toronto call
Enter the planned Karachi date and time, then choose Toronto to avoid manually applying a seasonal offset.
Tokyo arrival check
Convert a departure-time reference to Tokyo and confirm whether the destination calendar date changes.
Frequently asked questions
Does the converter handle daylight saving time?
Yes. It uses browser IANA timezone rules for the specific date, which is more reliable than applying one fixed offset all year.
Why can two cities change their time difference?
Countries begin and end daylight saving on different dates, and many regions do not observe it at all.
Can the converted result fall on another day?
Yes. Large east-west offsets can move the destination time to the previous or following calendar date.
Should I use city time or a UTC offset?
Choose a named timezone for future dates because a fixed UTC offset cannot represent seasonal rule changes.
Limitations
Time-zone laws can change, and ambiguous clock times around daylight-saving transitions should be confirmed for important travel or meetings.