Time Zone Converter
Convert times across world time zones instantly.
How to use
- Pick the "source time zone" that the time belongs to — your device's zone is selected by default.
- Choose a date and time, or press "Now" to use the current moment.
- Tick the target city zones you want to compare (any number), and results appear row by row in the order shown.
- Each row shows that zone's date, time and weekday plus its UTC offset; daylight saving is handled automatically by the browser's Intl engine — no manual adjustments needed.
- Changing the zone, time or checkboxes re-converts instantly, so you can line up every city for a cross-time-zone meeting in one view.
FAQ
Do I need to handle daylight saving time myself?
No. Conversions use the browser's built-in IANA time-zone database (Intl.DateTimeFormat), so each zone's DST rules apply automatically — New York, for example, shows UTC−4 during daylight saving.
Which time zone is the input interpreted in?
The date-time you type is interpreted as local wall time in the selected source zone, then converted to every target zone, so all results correspond to the same real instant.
How complete is the zone list?
The source dropdown is filled from Intl.supportedValuesOf('timeZone'), covering hundreds of IANA zones. On older browsers without that API it falls back to a built-in list of common zones — the tool keeps working either way.
Why do two cities show the same offset?
Some cities share a time zone or happen to have the same offset right now (Shanghai and Singapore are both UTC+8, for example). Identical rows mean identical local times — that is expected.