Convert a time
Meeting planner
Every hour of the selected day, in each city. Click any hour to convert it.
Working with epoch timestamps instead of wall-clock times? The Unix Timestamp Converter handles that side, and once the meeting starts the Timer keeps it to length.
Add as many zones as your team spans and convert them all in one shot, rather than a pair at a time, with day differences called out so nothing lands a day early.
Offsets are looked up for the exact date you chose in your browser's IANA database. They are not assumed, and not stale for the weeks when countries disagree.
Conversions use your own device's clock and time-zone data. Cities you add are stored only in your own browser, and the page keeps working offline.
How time zone conversion actually works
Every conversion here starts from one idea: a moment in time is a single instant, and a time zone is just a rule for what the clocks read at that instant. Convert a time and you are not changing when something happens, only how it is written down in each place.
Offsets are not fixed
The most common mistake is treating a zone as a fixed number of hours from UTC. "New York is UTC-5" is only true for part of the year; from mid-March to early November it is UTC-4. Worse, countries switch on different dates, so for a couple of weeks each spring and autumn the usual gap between two cities is simply wrong. Between mid-March and late March, London and New York are 4 hours apart rather than the familiar 5.
This is why the converter asks for a date and not just a time. Each zone's offset is looked up for that specific instant using the IANA time zone database built into your browser, the same database that powers operating systems and servers worldwide.
Why cities, not abbreviations
Zones are named America/New_York rather than EST for good reason. Abbreviations are ambiguous and unofficial: CST means Central Standard Time in the US, China Standard Time, and Cuba Standard Time. IST covers India, Ireland, and Israel. A city name is unambiguous and carries that place's entire history of clock changes, so a date in 1990 converts as correctly as one next week.
Missing and repeated hours
When clocks spring forward, an hour never happens: 02:30 simply does not exist that day. When they fall back, an hour happens twice. This tool resolves such times the way your operating system does, so you always land on a real instant.
Common time zones
| Zone | City | Standard | Daylight |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC+0 | Never changes |
| America/Los_Angeles | Los Angeles | UTC-8 (PST) | UTC-7 (PDT) |
| America/Chicago | Chicago | UTC-6 (CST) | UTC-5 (CDT) |
| America/New_York | New York | UTC-5 (EST) | UTC-4 (EDT) |
| Europe/London | London | UTC+0 (GMT) | UTC+1 (BST) |
| Europe/Berlin | Berlin, Paris, Madrid | UTC+1 (CET) | UTC+2 (CEST) |
| Asia/Dubai | Dubai | UTC+4 | No daylight saving |
| Asia/Kolkata | Mumbai, Delhi | UTC+5:30 | No daylight saving |
| Asia/Singapore | Singapore | UTC+8 | No daylight saving |
| Asia/Shanghai | Beijing, Shanghai | UTC+8 | No daylight saving |
| Asia/Tokyo | Tokyo | UTC+9 | No daylight saving |
| Australia/Sydney | Sydney | UTC+10 (AEST) | UTC+11 (AEDT) |
Note the half-hour and quarter-hour zones: India is UTC+5:30, Nepal is UTC+5:45, and parts of Australia sit at UTC+9:30. Any assumption that offsets are whole hours will eventually break.
Frequently asked questions
How do I convert a time between two time zones?
Set the date and time in the top card and choose which zone that time belongs to. Every city in the list below immediately shows the matching local time for that same instant, along with its UTC offset and how many hours ahead or behind it is. Add as many cities as you need. They are all converted at once, not just a pair.
Does this handle daylight saving time?
Yes, automatically. Conversions use your browser's built-in IANA time zone database, so each zone's offset is calculated for the specific date you picked rather than assumed. That matters most in the weeks when two countries disagree. London is normally 5 hours ahead of New York, in both winter and summer, but for about three weeks each March, after the US has moved its clocks forward and before the UK moves its own, the gap is only 4 hours. Pick a date in mid-March and you can watch it change.
What is the difference between UTC and GMT?
For everyday purposes they name the same moment. UTC (Coordinated Universal Time) is the modern standard, defined by atomic clocks and kept within a second of the Earth's rotation by occasional leap seconds. GMT (Greenwich Mean Time) is an older astronomical time scale that is now also a civil time zone used in the UK and parts of Africa. The practical difference: UTC never changes, whereas the UK's clocks move to BST (UTC+1) in summer, so London is not always GMT.
Why does the date change when I convert a time?
Because the world's zones span more than 24 hours, one instant can fall on different calendar days in different places. When it is 9am Thursday in New York it is already 10pm Thursday in Tokyo, and 8am Monday in Los Angeles is 1am Tuesday in Sydney. Any city on a different day shows a +1 or -1 day marker so a meeting invitation never lands on the wrong date.
How do I find a meeting time that works across time zones?
Use the hour strip. Each row is one city and each cell is one hour of the chosen day, shaded to show typical working hours, evenings, and night. Scan down a column and you can see instantly whether that moment is reasonable everywhere or the middle of the night for someone. Click any cell to convert that exact hour.
Is my data sent anywhere?
No. Every conversion runs in JavaScript in your browser using its own time zone database and your device's clock. The cities you add are saved only in your browser's local storage, never uploaded, and the page keeps working offline once loaded.