Time Zone Converter
Convert a time between time zones. Choose where you are starting from, the date and time, and up to three places to convert to. Daylight saving time is handled for each place and date.
Time in London
2:00 PM
Enter a valid date and time.
- Date there
- Sat, Nov 14 (same day)
- Difference from UTC
- UTC
- Tokyo
- 11:00 PM · Sat, Nov 14 (same day)
- And also
- —
Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
First the calculator turns the date and time you enter into one exact moment in time (UTC), using the clock rules of the starting zone for that date. Then it shows what the clock reads at that moment in each of the other zones. The rules for daylight saving time, including the dates each country changes its clocks, come from the time zone database built into your browser, so they are up to date and apply to any year.
The formula
Time there = time here − UTC offset here + UTC offset there
The UTC offset of each place changes with daylight saving time, which is why the converter looks it up for the exact date.
Worked example
It is 8:00 AM in New York on July 1.
- In July New York is on daylight saving time, so its offset is UTC−4. 8:00 AM there is 12:00 UTC.
- London is on summer time too (UTC+1): 12:00 + 1 hour = 1:00 PM.
- Tokyo is at UTC+9 all year: 12:00 + 9 hours = 9:00 PM.
Frequently asked questions
How do I convert a time to another time zone?
Pick the time zone you are starting from, enter the date and time, and choose the zone you want to convert to. The calculator shows the time and date there, and whether it is the same day, the next day, or the previous day. It starts with the time of your own device, so you can also just press "Use the current time".
Does the converter handle daylight saving time?
Yes. It uses the rules for each place and each year that your browser knows, so a meeting in July and the same meeting in January convert correctly even if the places change their clocks on different dates. The result also tells you when a place is on daylight saving time.
Why does the time difference between two cities change during the year?
Different countries change their clocks on different dates, and some never do. For example, the US moves its clocks in March and November, while Europe moves them a few weeks later in March and October, so New York and London are 4 hours apart for a few weeks instead of 5. Argentina and Japan do not change at all.
What happens with a time that is skipped or repeated?
When the clocks move forward, one hour does not exist that day (for example 2:30 AM in New York on the second Sunday of March). When they go back, one hour happens twice. The calculator warns you and uses the hour after the change in the first case and the first occurrence in the second.