Time Zone Converter and World Clock
Pick a date, time, and starting time zone to see the local time in cities around the world side by side. It is handy for scheduling online meetings or calls across countries: you can tell at a glance what time it is for the other person. Daylight saving time changes are applied automatically by your browser’s Intl support, so there is no need to calculate offsets by hand. Use “Now” to turn it into a world clock. Everything runs in your browser, and nothing you type is sent to a server. To convert epoch values, try the Unix Timestamp Converter.
🔒 Runs in your browser · Your data is never sent to a server
Cities and time zones to convert to
How to use
- Choose the date and time and the starting time zone (they default to now and your device’s time zone).
- The list shows the local time, weekday, and UTC offset for each city.
- Type an IANA name such as Europe/Madrid under “Add a time zone” to add a city to the list.
Notes
- Offsets and daylight saving rules come from the time zone data built into your browser. If a country changed its rules recently, an older browser may be slow to reflect it.
- The list of cities returns to its default when you reload the page.
- The day difference compares each city’s date with the date in the starting time zone.
Glossary
IANA time zone name
An identifier in the form Region/City, such as Asia/Tokyo or America/New_York. It carries the daylight saving history, so it is more accurate than a fixed offset like UTC+9.
UTC (Coordinated Universal Time)
The world’s reference time. Local times are expressed as an offset from UTC; Japan Standard Time is UTC+9.
Daylight saving time (DST)
The practice of moving clocks forward an hour during summer. On the switch days some local times do not exist and others occur twice. Japan does not use DST.
FAQ
Is daylight saving time applied automatically?
Yes. For the date you enter, the tool checks whether each city observes daylight saving time using your browser’s time zone data. For example, New York is calculated as UTC-4 in summer and UTC-5 in winter.
What happens if I enter a time that does not exist or occurs twice?
On the day daylight saving starts, some times (like 2:30 a.m.) do not exist, and on the day it ends, some times happen twice. A non-existent time is converted with the offset from before the change, and a repeated time uses the earlier one (during daylight saving). A note is shown when this applies.
How do I add a city that is not in the list?
Type an IANA name such as Europe/Madrid or America/Toronto under “Add a time zone” and press Add. The input suggests the time zone names your browser supports.
How is the day difference calculated?
It compares each city’s local date with the date in your starting time zone. For example, 9:00 a.m. in Tokyo is the evening of the previous day in New York, so it shows -1 day.
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