Time Zone Converter
Convert a date and time from any IANA time zone to several others at once. Correct DST offsets for the exact date, gap and overlap warnings.
Converted times
Offsets and daylight saving time come from the IANA time zone database built into your browser, for the exact date you enter.
What is Time Zone Converter?
Converts a local date and time in one time zone into the matching local times in as many other zones as you like. It uses the full IANA time zone list (for example America/New_York, Europe/London, Asia/Kolkata) and the daylight saving rules that apply on the date you enter.
How to use Time Zone Converter
- Enter the Date and Time, or click Now.
- Choose the From time zone (click Use my time zone for your device zone).
- Pick the target zones in the list; use Add time zone for more and × to remove one.
- Read each converted date and time with its UTC offset and zone name, or copy all results as text.
Example
2026-03-10 09:00 America/New_York
Asia/Tokyo: 2026-03-10 22:00 (UTC+09:00); Europe/London: 2026-03-10 13:00 (UTC+00:00); UTC: 2026-03-10 13:00 (UTC+00:00)
New York is already on daylight time (UTC-04:00) on 10 March 2026, London is not yet.
When to use Time Zone Converter
Use it to schedule calls, check flight or broadcast times, or convert log timestamps between zones. To find a time that suits several people's working hours, use the meeting planner instead; to convert Unix timestamps, use a timestamp converter.
How Time Zone Converter works
The tool first turns your wall-clock time into an exact instant: it looks up the zone's UTC offset with Intl.DateTimeFormat for that moment and checks the result, which handles daylight saving transitions. If the local time does not exist (clocks spring forward) it is moved forward by the gap; if it occurs twice (clocks fall back) the first occurrence is used, and a note explains this. The instant is then formatted in every target zone, and a badge shows when the date there is the next or previous day.
Common Use Cases
- Telling a colleague in Tokyo what 9:00 in New York means for them
- Converting a webinar time into several audience time zones
- Checking whether a date falls in daylight saving time
- Converting server times in UTC to local office time
FAQs
Is daylight saving time handled?
Yes. Offsets come from the IANA database in your browser and are looked up for the exact date and time you enter, so dates before and after a DST change convert correctly.
What happens with a time that doesn't exist, like 02:30 on the spring-forward day?
It is moved forward by the length of the gap (02:30 becomes 03:30) and a warning is shown.
Why do I see zone IDs like Asia/Ho_Chi_Minh instead of abbreviations like ICT?
Abbreviations are ambiguous (CST means three different zones). IANA IDs are unambiguous; the localized zone name is shown under each result.
Does it need an internet connection?
No. All calculations use the time zone data built into your browser.