Compare city times

Compare two to four cities using IANA timezones. Enter a custom date and time in the first city to convert that instant everywhere else.

Leave blank to use the current time.

Try Compare London and New York time or Compare Sydney and London time.

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Frequently asked questions

Each city is converted with DateTimeZone for the same instant. The difference is the gap between those offsets on that date, including daylight saving.

The helper looks for hours when every selected city is between 09:00 and 17:00 local time. If no hour overlaps, it reports that no shared working hour exists that day.