How is the offset calculated?

The tool uses the Intl.DateTimeFormat API built into modern browsers to read the UTC offset for each selected time zone at the current moment, then subtracts one from the other.

Does it account for Daylight Saving Time?

Yes. The offset is computed for the current date and time, so DST transitions are reflected automatically. The DST badge shows whether DST is currently active in each zone.

What counts as 'business hours' in the meeting planner?

Business hours are defined as 09:00–17:00 local time. Green slots mean both zones are in business hours; yellow means one zone is; red means neither is.

How many time zones are available?

All major IANA time zones are listed, covering every country and territory worldwide.

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Time Zone Offset Calculator

Compare two time zones, see the offset, DST status, and find the best meeting time.

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Select any two IANA time zones from the searchable dropdowns and instantly see the current local time in each zone, the hour offset between them, and whether Daylight Saving Time is currently active. The 24-hour meeting planner highlights each hour of the day in green (business hours for both zones), yellow (business hours for one zone), or red (outside business hours for both), making it easy to schedule calls and meetings across continents.

Cómo usar

1 Select the first time zone from the 'Zone A' dropdown (type to search).
2 Select the second time zone from the 'Zone B' dropdown.
3 View the current local time, UTC offset, and DST status for both zones.
4 Scroll to the 24-hour meeting planner to see color-coded overlap blocks.
5 The clocks update automatically every second.

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