Time Zone Converter and Meeting Planner
Convert a date and time between time zones, with daylight saving handled. See offsets, day changes and the best meeting hours. Runs in your browser.
Pick a date, a time and the time zone it is in, and see that moment in every zone you add: local time, date, UTC offset and whether daylight saving is in effect. Below, the meeting planner shades each hour of the day as working time, early or late, or night, and tells you the hours that suit everyone.
Meeting planner
Each column is one hour of the day in the time zone you chose above. Green is working time (9:00 to 18:00), amber is early morning or evening, grey is night.
What it does
- Converts any date and time between any of the IANA time zones your browser knows (about 400).
- Uses the time zone rules built into your browser, so daylight saving dates and recent rule changes follow the real calendar for the date you pick, in past or future.
- Warns when the time you typed does not exist (clocks jump forward) or happens twice (clocks go back).
- Shows the UTC offset, the short zone name, a daylight saving note and +1 / -1 day changes.
- Meeting planner: a 24-hour grid for all zones with the hours everyone is awake and at work.
- 12 or 24 hour clock, Unix timestamp, and a copyable link that restores your setup.
Time zone rules change by government decision. The results use the rules in your browser's current time zone database. For legal or flight times, confirm with the organiser.
Frequently asked questions
- How does it handle daylight saving time?
- The conversion uses the zone's actual rules for the exact date you choose, so July and January give different offsets for the same city. The table shows when daylight saving is in effect.
- What happens at the clock change hour?
- In spring the clocks skip an hour, so a time such as 02:30 does not exist; the tool moves it to the next valid time and tells you. In autumn an hour happens twice, so it uses the first one and tells you how far apart the two are.
- Why use names like America/New_York instead of EST?
- Abbreviations are ambiguous (CST can mean three different zones) and do not say when daylight saving applies. City-based names are exact. The short names such as EDT or CET are still shown in the Offset column.
- Can I share my setup?
- Yes. Press Copy link to this setup. The link stores the date, time and zones in the address after the #, so it never goes to a server.
- How does the meeting planner choose good hours?
- It lists hours in your chosen zone when every zone you added is between 8:00 and 20:00 local time. Green cells are 9:00 to 18:00 working time.
- Does it use my computer's clock?
- Only for the starting time (the Use the current time button) and to know your own zone. Everything else is calculation.
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