Timezone Converter
Convert times between any two timezones. Handles daylight saving automatically. Common zones preloaded; supports all IANA timezones.
How to use this converter
Enter the date and time in the source timezone. Pick the source and target zones from the dropdowns. The converter shows the equivalent time in both zones, along with the offset between them. Use the swap button to reverse the direction.
Why timezones are complicated
Time zones are a political and practical compromise. The world was divided into 24 roughly one-hour zones in the late 1800s, but actual boundaries follow borders and economic regions rather than meridian lines. Some zones are offset by 30 or 45 minutes (India, Nepal, Newfoundland). Daylight Saving Time, adopted and dropped sporadically around the world, makes calculations even messier.
Daylight Saving Time in brief
Most US states "spring forward" on the second Sunday of March and "fall back" on the first Sunday of November. Europe switches the last Sundays of March and October. Australia switches the first Sundays of April (ends) and October (starts) — opposite because of the hemisphere. Japan, China, most of Africa, and most of Asia don't observe DST. The calculator uses IANA zone data to get the right offset for any given date.
Common scheduling gotchas
A 9 AM ET meeting is NOT the same UTC time all year: in March it's 14:00 UTC (EDT, UTC-4), in January it's 14:00 UTC (EST, UTC-5). European attendees see the meeting at different local times depending on whether their DST has already kicked in. Always create calendar events in a specific timezone, not "naive" local time.
Good zones to memorize
UTC: The reference zone; never changes. New York (ET): UTC-5/-4. London (GMT/BST): UTC+0/+1. Berlin (CET/CEST): UTC+1/+2. Mumbai (IST): UTC+5:30, no DST. Tokyo (JST): UTC+9, no DST. Sydney (AEST/AEDT): UTC+10/+11 (DST is opposite to Northern Hemisphere).
Frequently asked questions
Does this handle Daylight Saving Time?▾
Yes. The calculator uses your browser's IANA timezone database (via Intl.DateTimeFormat), which automatically applies DST rules for each zone. Convert 9 AM New York on March 15 vs April 15 and you'll see different UTC offsets — that's DST at work.
How do I know which timezone to pick?▾
Match the city closest to where the event is happening. For US cities: New York = Eastern, Chicago = Central, Denver = Mountain (but Phoenix has its own since Arizona doesn't observe DST), Los Angeles = Pacific. For international cities, use the major metropolitan area nearby.
Why is Arizona different?▾
Arizona (except the Navajo Nation) doesn't observe Daylight Saving Time. So in winter, Arizona matches Mountain Time (UTC-7); in summer, it matches Pacific Time (UTC-7 still, while MT moves to UTC-6). Always use 'America/Phoenix' for Arizona.
What's the difference between EST and EDT?▾
EST (Eastern Standard Time) is UTC-5, used in winter. EDT (Eastern Daylight Time) is UTC-4, used from mid-March to early November. Most US timezones have similar 'Standard' and 'Daylight' versions, swapping at DST transitions. The calculator handles this automatically.
Can I use this for scheduling meetings?▾
Yes. Enter the meeting time in your timezone, then check what it looks like for each attendee's zone. For recurring meetings, remember that DST transitions differ by country — the US changes in March/November, Europe in March/October, Australia in April/October, while much of Asia doesn't observe DST at all.
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