Time zone converter
Enter a time in one city and see it everywhere else, with daylight saving time and date changes handled for you.
| City | Local time | Date | Zone | Difference | Remove |
|---|---|---|---|---|---|
| New York | — | source | |||
| London | — | ||||
| Tokyo | — |
Why the clock and the Sun disagree
Time zones are political, the Sun is not. The Sun crosses 15° of longitude every hour (4 minutes per degree), so solar noon happens at 12:00 only on the meridian at 15° × your UTC offset. West of it, the Sun runs late on your clock.
Ignores the equation of time, which moves solar noon a further ±16 minutes over the year. The sunrise calculator includes it.
Daylight saving time pitfalls
- Different change dates. The US and Canada move clocks on the second Sunday of March and the first Sunday of November; the EU and UK on the last Sundays of March and October. For a few weeks the usual gap shrinks by an hour.
- Opposite seasons. Southern Hemisphere places like Sydney and Santiago observe DST from roughly October to April, so the gap with Europe can swing by two hours over the year.
- Many places never change. Most of Asia and Africa, Arizona (except the Navajo Nation), Hawaii and Queensland stay on standard time.
- Missing and repeated hours. A time like 02:30 on the spring-forward night does not exist locally; the converter shifts it to the valid time.
Frequently asked questions
How do I convert time between time zones?
Pick the source city and time, and every other city updates. Under the hood the time is converted to UTC using the source zone’s offset on that date (including daylight saving time), then to each target zone’s offset on that same instant.
How do I calculate the time difference between two places?
Subtract their UTC offsets on the same date. New York in July is UTC−4 and London is UTC+1, so London is 5 hours ahead. In late March the gap is briefly 4 hours because the US changes its clocks two to three weeks before Europe.
What is UTC?
Coordinated Universal Time, the world’s reference time. It does not observe daylight saving. GMT is the same as UTC for everyday purposes, but the UK switches from GMT to BST (UTC+1) in summer.
Why do some places have 30- or 45-minute offsets?
Countries choose offsets that fit their geography or politics. India uses UTC+5:30 as a compromise across its width, Nepal UTC+5:45, and parts of Australia UTC+9:30. China uses a single zone (UTC+8) across 60° of longitude.