World Clock

Compare the time across multiple time zones at once — defaults to right now, or pick any reference date and time to see what it looks like elsewhere.

Reference date & time

Reference time zone

How to use this calculator

Set the reference date/time and zone (defaults to now, in your own zone), then add up to six time zones to compare — each card updates live as you change the reference or add/ remove zones.

Real time zone data Uses your browser's built-in time zone database, so daylight saving is handled automatically and correctly for the reference date you enter.
Day difference A zone can be a calendar day ahead or behind the reference zone even at the exact same moment — the "+1 day" / "−1 day" badge shows when that's the case.
Day / Night A simple approximation (6 AM–6 PM local time counts as "Day") — not based on actual sunrise/sunset times for that location.