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.

Core timing workflows

Start with a direct timer, stopwatch, alarm or focus workflow. Calendar, date arithmetic, clocks and scheduling specialists remain available from the full Date & Time hub.

All 76 date & time tools

Online TimerCountdown, sound, repeat & fullscreen StopwatchLaps, precision & fullscreen Countdown TimerFocused countdown workflow Alarm ClockAlarm at a local clock time PomodoroFocus and break cycles Interval TimerWork/rest rounds Presentation TimerTalk timing with warnings Classroom TimerProjector-friendly countdown

Multi-offset meeting-time table

Take the calculated UTC instant and show it across several fixed UTC offsets at once, preserving date rollover and half-hour or quarter-hour offsets.

Offsets, comma separated

—UTC instant

—Offsets

Offset	Local date/time

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.

Offset-at-an-instant semantics

UTC offset belongs to a zone at a specific instant. During a fall-back repetition one wall-clock time can map to two offsets; during a spring-forward gap it can map to none.