Guide
About Time Zones
How to use it
- Choose the time zone the time is given in (it starts with yours), then pick a date and time.
- Every card shows the same moment in another zone, with its UTC offset and a +1/-1 day marker when the date differs.
- Add the cities of everyone in your meeting, then use the planner: rows where all cells are green are inside 9:00-17:00 for everyone. Click a row to select it.
Daylight saving makes offsets change
The gap between two cities is not constant. New York and London are usually 5 hours apart, but for a few weeks each spring and autumn it is 4 hours, because the US and Europe change their clocks on different dates. The southern hemisphere moves its clocks in the opposite direction, so Sydney and London can be anywhere from 9 to 11 hours apart.
This converter uses the time zone database built into your browser, so each conversion uses the rules in force on the date you choose.
Tips for scheduling across zones
- Write meeting times with a zone name or UTC offset, for example "15:00 UTC" or "10:00 New York time"; avoid ambiguous abbreviations like CST or IST.
- Not every zone is a whole number of hours from UTC: India is UTC+5:30 and Nepal UTC+5:45.
- Calendar invites store the time zone, so they adjust automatically for every attendee.
Frequently asked questions
Why does my time zone show a city instead of a name like 'Eastern Time'?
Time zones are identified by representative cities (the IANA names such as America/New_York) because they capture each region's full daylight-saving history, which a generic name cannot.
What happens to times skipped by daylight saving?
On the night clocks spring forward, times such as 02:30 don't exist. The converter moves them to the equivalent time after the change. Times that happen twice when clocks fall back use the first occurrence.
Is UTC the same as GMT?
For everyday purposes, yes. UTC is the precise scientific standard; GMT is also the name of the UK's winter time zone. Note that London switches to BST (UTC+1) in summer.