Time Difference Calculator

Compare two zones at the same instant, including daylight-saving changes that can make the difference vary by season.

Date & time in Zone A

Zone A

Zone B

Repeated time

—Zone B − Zone A

—Zone A offset

—Zone B offset

—Local-time status

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Compare offsets at a specific instant

Enter a wall-clock time in Zone A and compare its UTC offset with Zone B. The difference is date-sensitive, so zones can be five hours apart in one season and four hours apart in another when DST schedules differ.

DST ambiguity

Repeated fall-back times can map to two instants; choose earlier or later. Clock-forward gaps are rejected rather than silently shifted.