Time Zone Converter
See a single moment in time across major world time zones at once, with daylight saving handled for that specific date.
See one moment in time across every major time zone, so a meeting lands where you expect.
Around the world
Offsets follow each zone's own daylight saving rules for that date, which is why the gap between two cities changes across the year.
Generating...About the time zone converter
Scheduling across time zones fails because the offset between two cities is not constant. Daylight saving starts on different dates in different countries, and in the southern hemisphere it runs the opposite way, so London to Sydney is nine hours apart for part of the year and eleven for another.
Every time shown here is calculated for the date you enter, using each zone's own rules for that date, so a meeting set months ahead lands where you expect.
How to use it
- 1Pick the date.
- 2Enter the time in 24 hour form.
- 3Choose which zone that time is in.
- 4Read the same moment in every other zone.
- 5Copy the ISO timestamp if you need it for a calendar invite.
Questions
Why is the difference between two cities not fixed?
Daylight saving. Countries change clocks on different dates, and some do not change at all, so the gap between two zones shifts several times a year.
What is the safest way to schedule across zones?
Send a calendar invite. It carries the actual instant and each attendee's software converts it, which removes the arithmetic entirely.
Why use UTC on servers?
UTC has no daylight saving, so it never jumps forward or repeats an hour. Store in UTC, convert for display.
Are the offsets correct for past dates?
They use your browser's time zone database, which is accurate for recent history and for the current rules. Very old dates may differ.