Time Zone Converter
What time a moment is somewhere else — with the date difference, the offset between the two places and whether either is on daylight saving.
The conversion uses your browser's own time-zone database (the IANA zones), so daylight saving is applied correctly for the date you pick rather than assumed from today.
How the time zone converter works
The conversion uses your browser's own time-zone database (the IANA zones), so daylight saving is applied correctly for the date you pick rather than assumed from today. That matters more than it sounds: the gap between a northern and a southern city changes twice a year, because the two hemispheres put their clocks forward at opposite ends of the calendar — a pair that is nine hours apart in June can be eleven hours apart in December. Pick the date as well as the time and the answer is right for that day.
Formula: target local time = UTC instant rendered in the target zone
Worked examples
| Inputs | Time there | Note |
|---|---|---|
| 09:00 London → New York | 04:00 | 04:00 — five hours behind in summer |
| 09:00 New York → London | 14:00 | 14:00 the same day |
| 18:00 Tokyo → London | 09:00 | 09:00 the same morning |
FAQFrequently asked questions
Does this handle daylight saving?
Yes — it uses your browser's IANA time-zone database and applies the rules for the date you choose, not for today.
Why does the difference between two cities change during the year?
Because the northern and southern hemispheres put their clocks forward at opposite ends of the calendar, so a pair spanning them can be nine hours apart in one season and eleven in the other.
What does UTC+5:30 mean?
Some zones are offset by half or three-quarters of an hour — India is +5:30, Nepal +5:45, and parts of Australia +8:45.
Why does the date sometimes change?
Crossing enough hours moves you into the next or previous day; the day-difference row makes that explicit so meetings are not booked a day out.
Which zone should I pick for a country?
These are the major business zones. Countries with several zones — the US and Australia — need the specific city.
Where these figures come from
- ISO 8601 — Date and time — Representations for information interchange — the yyyy-mm-dd format and the week-numbering rules used here
- US Naval Observatory — Calendars — the Gregorian leap-year rule
- GOV.UK — bank holidays — bank holidays by nation (not applied here)
Last checked: September 2026. The Gregorian calendar rules do not change; working-day counts exclude Saturdays and Sundays only.