Time Zone Converter
Convert a date and time from one time zone to several others at once. Uses IANA zone names, so daylight saving changes are handled automatically.
Choose a date, a time and a source zone, then press Convert.
What the time zone converter does
This tool takes a date and a local time in one time zone and shows the same moment in several other zones. You choose the source zone from a list of common IANA time zones, such as America/New_York or Asia/Karachi, then select as many target zones as you need. Each result shows the local date, the local time and the UTC offset in effect on that day.
The converter does not depend on the time zone of the device you are using. A laptop set to London gives the same answers as one set to Tokyo, which matters when you schedule across regions. Daylight saving rules are applied from the browser's built-in time zone data, so each zone follows its own changes.
How to use it
- Enter the date of the event in the source zone.
- Enter the time on the 24-hour clock. The time is read as local time in the source zone.
- Choose the source time zone from the drop-down list.
- Tick one or more target zones. A sample set is ticked by default.
- Press Convert. Each selected zone shows its local date, local time and UTC offset, and the UTC instant is shown in ISO format for reference.
Worked example
A call is set for 15 March 2026 at 09:30 in New York. On that date the United States is already on daylight saving time, so New York runs at UTC−4, and the same moment is 13:30 UTC.
From that UTC instant, London is still on GMT (UTC+0) and shows 13:30. Karachi (UTC+5) shows 18:30, Kolkata (UTC+5:30) shows 19:00, and Dubai (UTC+4) shows 17:30. Tokyo (UTC+9) shows 22:30 on the same date. Sydney is on daylight time (UTC+11) on that date, so it shows 00:30 on 16 March. The date changes there, which is why each result prints the full day as well as the time.
Tips and limits
- Use IANA names such as Europe/Paris rather than abbreviations such as CET. An abbreviation can mean several different offsets, while an IANA name carries the full daylight saving history for that region.
- A time that falls in a daylight saving gap, when clocks jump forward, does not exist locally. The converted result may not match the time you typed, so avoid scheduling exactly at those times.
- When clocks go back, the same wall-clock hour occurs twice. The converter returns one of the two moments, so state the UTC offset in invitations for any meeting near a change.
- Read the UTC offset printed next to each result to check the conversion, since offsets such as +05:30 and +05:45 are easy to miss.
Time Zone Converter – Frequently Asked Questions
What is an IANA time zone name?
An IANA time zone name such as Europe/London or Asia/Kolkata comes from the public tz database. Unlike short abbreviations such as IST or CST, the name identifies a region, and its offset and daylight saving rules are kept up to date in the database.
Does the converter use the time zone of my device?
No. The date and time you enter are read as local time in the source zone you select, and each target zone is calculated from that instant. Your computer can be set to any zone and the results stay the same.
Why is the UTC offset shown next to each result?
The offset is the difference between a zone's local clock and UTC. Showing it lets you confirm a conversion at a glance. India, for example, is UTC+05:30, and Nepal is UTC+05:45.
What happens to times during a daylight saving change?
When clocks jump forward, some local times are skipped and do not exist. When they fall back, some local times occur twice. Avoid scheduling in those windows, or state the UTC offset in the invitation.
Which zones are in the list?
The list contains about 30 common zones across the Americas, Europe, Africa, Asia, Australia and the Pacific, plus UTC. Any zone not in the list cannot be selected here.