Time Zone Converter – World Clock & Time Difference
See the current time in any two cities or time zones at once, with the exact time difference between them.
About Time Zone Converter
See the current time in any two cities or time zones at once, with the exact time difference between them. Our time zone converter uses your device's IANA database, so daylight-saving rules are applied automatically. Compare New York, London, Dubai, Casablanca, Tokyo and more.
📖 The Full Guide
How time zones and daylight saving work, how to schedule meetings across continents, and how to compare any two cities instantly — with a free converter.
Read the article →🌍 Time Zone Converter
How to Use
Pick your time zone or city.
Pick the second time zone.
Optionally choose a date & time to convert.
See both times and the difference instantly.
Frequently Asked Questions
The calculator formats the same moment in two time zones using your browser's built-in time zone database, then shows the hour offset between them.
Yes — because the conversion uses your device's IANA time zone database, daylight saving rules are applied automatically.
Yes — set the date-time field to any moment and both time zones will show that exact moment formatted locally.
Pick UTC as one of the two zones in our converter — it shows the current UTC time instantly, and any other zone in the second slot.
There are 24 main time zones, but with offsets and variations the IANA database lists over 500. Our converter covers 29+ popular zones.
The Formula
The same instant is formatted in each zone with Intl.DateTimeFormat, and the difference is computed from the two local representations.