Convertisseur de fuseaux horaires
Convertissez une date et une heure d'un fuseau horaire vers jusqu'à dix autres, avec une gestion correcte de l'heure d'été.
Résultats
Mode d'emploi
- Pick the date and time you want to convert (or press “Utiliser l'heure actuelle”).
- Search for the source city — the tool uses its IANA time zone.
- Add up to ten destination cities. Each result shows the converted date, time and whether it lands on the previous, same or next day.
- Copy the whole result list or share a link that restores this exact conversion.
How the conversion works
The tool first interprets your input as wall-clock time in the source zone and resolves it to an exact UTC instant using the IANA time zone database. That single instant is then formatted in every destination zone. Doing it this way — rather than adding fixed offsets — is what makes results correct across daylight saving transitions, half-hour offsets and date-line crossings.
Exemples
- 9:00 in New York is 22:00 the same day in Seoul in winter, but 22:00 becomes 21:00 for two short windows each year when only one of the two has switched its clocks.
- 17:00 Friday in Los Angeles is already 10:00 Saturday in Sydney — the planner marks it “next day” so you don’t book a weekend meeting by accident.
Questions fréquentes
Why do I sometimes see a warning that a time “does not exist”?
When daylight saving time starts, clocks jump forward — typically from 2:00 straight to 3:00. Times inside that skipped hour never happen on that date in that zone. The converter tells you and uses the next valid moment instead.
Why can one local time have two possible results?
When daylight saving time ends, clocks are set back, so one wall-clock hour happens twice. For a time in that window you can choose whether you mean the first occurrence (still on DST) or the second (back on standard time).
Does the converter handle half-hour and 45-minute offsets?
Yes. Zones such as India (UTC+5:30), Iran (UTC+3:30) and Nepal (UTC+5:45) are handled exactly, because all math uses the IANA time zone database rather than whole-hour assumptions.
Why should I never rely on abbreviations like CST or IST?
The same abbreviation can mean different zones — CST is used for Central Standard Time in North America, China Standard Time, and Cuba Standard Time; IST can be India or Israel or Ireland. This tool always works with unambiguous IANA identifiers like America/Chicago.