TIME ZONES

Time Zone Offset Calculator

Pick two time zones and a date to see each one's UTC offset and the exact difference between them.

Search time zones for time zone aTime zone A

Search time zones for time zone bTime zone B

Date

Comparing UTC offsets

Every time zone is defined by its offset from UTC, which can change on a schedule when daylight saving time applies. This tool shows the offset for each of two zones on the date you choose, and the exact difference between them, which is what actually matters when scheduling a call or a handover between two places.

Why the difference can change through the year

Two zones that are 5 hours apart in one season can be 4 or 6 hours apart in another, if only one of them observes daylight saving time, or if they change on different dates. Checking the specific date, rather than assuming a fixed gap, avoids scheduling mistakes around those transition weeks.

Want the background? Read our comprehensive guide: Time Zones and DST for Developers.

How to use this tool

Choose the first time zone.
Choose the second time zone.
Pick a date, or select Use today.
Select Compare to see each offset and the difference between them.

Examples

Two zones compared on the same summer date.

London vs New York, 1 July 2026

Europe/London vs America/New_York

London offset: UTC+01:00
New York offset: UTC-04:00

Algiers vs Dubai, same date

Africa/Algiers vs Asia/Dubai

Algiers offset: UTC+01:00
Dubai offset: UTC+04:00

London vs New York, in winter

Europe/London vs America/New_York, 1 January 2026

London offset: UTC
New York offset: UTC-05:00

Both zones are on standard time in January, so the gap is 5 hours instead of the 4 hours it is in July.

Frequently Asked Questions

Why does the difference between two zones change during the year?

If one zone observes daylight saving time and the other does not, or they switch on different dates, the gap between their offsets shifts by an hour during the affected weeks.

Does this tool convert a specific time between the zones?

It shows the offset and the difference for the date you choose. For a specific clock time converted between zones, use the Timezone Converter.

What if I want to compare more than two zones at once?

Use the comparison table on the Timezone Converter or the World Clock, both of which show several zones side by side.

Does Algiers observe daylight saving time?

No. Algeria uses Central European Time all year, so its offset from UTC stays at +1 regardless of the date.