Method
How the time zone difference calculator works
Both zones are evaluated at the same noon UTC instant on the selected date. Their numeric UTC offsets are compared, which captures seasonal daylight-saving changes.
Example
Time zone difference calculator example
London and India differ by 4 hours 30 minutes during British Summer Time and 5 hours 30 minutes during UK standard time.
FAQ
Time zone difference calculator FAQ
Can the difference change during the year?
Yes. It changes when one zone enters or leaves daylight saving time and the other does not.
Why use noon on the comparison date?
Noon avoids many midnight boundary transitions while preserving the date’s applicable offset.
Does this compare elapsed travel time?
No. It compares clock offsets, not flight duration or calendar movement.
I meant the hours between two times
Use the time difference calculator instead. It measures elapsed time on a single clock, such as the eight hours 30 minutes between 09:15 and 17:45.