Time Zone Calculator
Convert a date and time in Central Europe to the local time in another city. Daylight saving time in both places is calculated automatically.
How to use the time zone calculator
- Choose the date the appointment or event falls on.
- Enter the time in Central Europe.
- Choose the city or time zone you want to compare with. The calculator shows the local time there, the time difference on that exact date, and whether it's the same day, the day before, or the day after in Central Europe.
How the time is calculated
The calculator uses the browser's built-in time zone database (IANA time zones via the Intl API) to look up the actual local time in the selected city for the exact date you enter. Daylight saving time in Central Europe and in the target city are both factored in automatically, since either one can shift the time difference by an hour for part of the year.
If the result goes below 00:00 or above 24:00 in the city, it means the time falls on the day before or the day after in Central Europe. This is shown in the text under the main result.
Half-hour and quarter-hour zones
Not every time zone sits a whole number of hours from UTC. India is on UTC+5:30, Iran on UTC+3:30, and parts of Australia on UTC+9:30 — and Nepal has one of the world's most distinctive offsets at UTC+5:45. Such offsets are a frequent source of scheduling errors, because they break the assumption that time differences are always whole hours.
Time zones are political decisions rather than geographical facts. China uses a single time zone for the whole country even though it spans several geographically. Countries can change zones or abandon daylight saving at short notice, which is why this calculator looks up the browser's time zone database rather than using fixed offsets — the database is updated when the rules change.
Frequently asked questions
Does the calculator account for daylight saving time?
Yes. The calculation uses the browser's IANA time zone database and looks up the actual offset in effect for both Central Europe and the selected city on the exact date you choose, instead of a single fixed time difference year-round.
Why do I need to enter a date, not just a time?
Because the time difference to several of these cities genuinely changes throughout the year. Sydney is a clear example: the difference to Central Europe can range from 8 to 10 hours depending on whether Europe and Australia are each in daylight saving time or standard time on the chosen date.
Which cities/time zones are available?
New York, Los Angeles, London, Dubai, Mumbai, Tokyo and Sydney. We may expand the list with more cities over time.
Why is the time difference to India a half-hour figure?
India uses a time zone (IST) offset by 30 minutes from whole hours, unlike most other countries. The time difference to Mumbai is therefore always a half-hour figure, such as +4.5 or +3.5 depending on the season.