Time Zone Converter
See the same moment in several cities at once, with day changes and daylight saving handled, then find a meeting time that suits everyone.
Advanced also finds any IANA time zone, such as Asia/Yakutsk or America/Argentina/Mendoza.
An end before the start means a night shift, such as 22:00 to 06:00.
Meeting planner
Each strip is one day in Dubai. Tap an hour to pick it.
How your time is converted
Your time → UTC → each place's offset → its local time.
- 1
Your time
10:00 DubaiUTC+4
- 2
Back to UTC
10:00 − 4h= 06:00 UTC
- 3
Each place's offset
London UTC+1New York UTC−4
- 4
Local times
London 07:00New York 02:00
Read more: the formula, a worked example, daylight saving and meeting tips
Every place keeps its clocks a set amount ahead of or behind Coordinated Universal Time (UTC). That amount is its offset: Dubai is UTC+4, India is UTC+5:30 and New York is UTC−5 in winter. To move a time from one place to another, go back to UTC first, then add the other place's offset. Places that use daylight saving change their offset in summer, so the offset always depends on the date.
The formula
UTC time = your local time − your offset
time in another place = UTC time + that place's offset
difference = their offset − your offset
Worked example
Take 10:00 in Dubai on Monday 12 October 2026. Dubai is UTC+4, so in UTC that is 10:00 − 4h = 06:00. London is on British Summer Time (UTC+1), so it is 06:00 + 1h = 07:00. New York is on Eastern Daylight Time (UTC−4), so it is 06:00 − 4h = 02:00. Mumbai is UTC+5:30, so it is 06:00 + 5h 30m = 11:30. Written as one line: 10:00 Dubai = 07:00 London = 02:00 New York = 11:30 Mumbai.
Daylight saving
Many places move their clocks forward an hour in summer and back in winter, but on different dates. In 2026 the UK and the EU go back on Sunday 25 October and the US on Sunday 1 November, so for one week London is only 4 hours ahead of New York. Places in the southern hemisphere, such as Sydney, do the opposite and move forward in spring (September to October). The Gulf states, India, China and Japan don't use daylight saving. The converter reads your browser's time zone database (the IANA database), so every offset is right for the date you pick, and the "Summer time" tag shows who is on daylight saving.
Half-hour and 45-minute zones
Not every offset is a whole number of hours. India and Sri Lanka are UTC+5:30, Iran is UTC+3:30, Nepal is UTC+5:45, central Australia is UTC+9:30 and Newfoundland is UTC−3:30. That is why 10:00 in Dubai is 11:30 in Mumbai and 11:45 in Kathmandu.
Common time zone abbreviations
| Abbreviation | Name | Offset |
|---|---|---|
| GMT / BST | UK time | UTC±0 / UTC+1 |
| CET / CEST | Central European Time | UTC+1 / UTC+2 |
| GST | Gulf Standard Time (UAE, Oman) | UTC+4 |
| IST | India Standard Time | UTC+5:30 |
| SGT / HKT | Singapore / Hong Kong | UTC+8 |
| JST | Japan Standard Time | UTC+9 |
| AEST / AEDT | Australian Eastern Time | UTC+10 / UTC+11 |
| EST / EDT | US Eastern Time | UTC−5 / UTC−4 |
| CST / CDT | US Central Time | UTC−6 / UTC−5 |
| PST / PDT | US Pacific Time | UTC−8 / UTC−7 |
Some abbreviations mean more than one thing: IST is also Irish Standard Time and CST is also China Standard Time. Searching for a city avoids the mix-up.
Meeting tips
- Send the time in each person's own city, or attach the .ics invite: calendar apps show it in each person's own time zone.
- Check the day as well as the hour. A morning call in Asia is often the evening before in the Americas.
- Around late March and late October to early November, gaps between Europe and North America change for a week or two. Pick the actual date in the planner.
Pilots and dispatchers: the Zulu time converter works in UTC with airport codes and date-time groups. Flying across zones? The jet lag planner builds a sleep plan for the trip.
Times come from your browser's built-in time zone database, which updates with your browser or operating system. Governments sometimes change their clock rules at short notice, so check very important times against official sources.
Common questions
How do I convert IST to EST?
India Standard Time is UTC+5:30 all year. US Eastern Time is UTC−5 in winter (EST) and UTC−4 in summer (EDT). So India is 10 hours 30 minutes ahead in winter and 9 hours 30 minutes ahead in summer. For example, 9:00 am in India is 10:30 pm the day before in New York in winter, or 11:30 pm in summer.
What time is it in Dubai when it is 9 am in London?
Dubai is UTC+4 and does not change its clocks. London is UTC+0 in winter and UTC+1 in summer (British Summer Time). So Dubai is 4 hours ahead in winter, when 9 am in London is 1 pm in Dubai, and 3 hours ahead in summer, when it is 12 noon.
Why does the time difference between two cities change during the year?
Places that use daylight saving change their clocks on different dates, and some places never change. In 2026 the UK and EU go back an hour on Sunday 25 October but the US waits until Sunday 1 November, so for that week London is 4 hours ahead of New York instead of 5. The converter uses the right offset for the date you pick.
How do I find a good meeting time across time zones?
Add everyone’s city, switch to Advanced and look at the meeting planner. Green hours are inside each person’s working hours, amber hours are awake but outside work and purple hours are night. For Dubai, London and New York in October there is no hour when all three are at work, so the best is 3 pm to 8 pm in Dubai: two of the three at work and nobody asleep.
What does +1 day or −1 day mean?
It means that city is already on the next calendar day, or still on the day before, at the moment you picked. For example, 10:00 on Monday in Dubai is 20:00 on Sunday in Honolulu, so Honolulu shows −1 day. Check the day as well as the time when you book a call.
Related calculators
Made by Zulu Calculator, part of AlphaZulu LLC. Formulas are shown in full and rule figures are checked against official sources; see how we build calculators.