UTC Offset Calculator

Resolve a local date/time in an IANA zone and see its UTC offset, UTC instant, DST ambiguity status, and formatted local result.

Local date & time

IANA time zone

Repeated time

—UTC offset

—Offset minutes

—Wall-clock status

—UTC instant

—Offset is evaluated at the selected date because DST can change it during the year.

Find the offset for a local time

Enter an IANA zone and local date/time. The tool resolves that wall-clock value, then reports the UTC offset, offset minutes, UTC instant, and whether the local time was unique, repeated, or nonexistent.

Why the date matters

Many zones change offset seasonally. “New York is UTC−5” is not always true; daylight time commonly changes the offset to UTC−4.