Time Zone Converter
Convert time between different time zones worldwide. Instantly find meeting times across IST, UTC, EST, PST, GMT and more.
About this calculator
Pick a date and time, a source zone and a target zone and read the converted time instantly.
Scheduling across India, the US, Europe and the Gulf is easy to get wrong by an hour or a day.
How to use it
- Pick the date and time.
- Choose the From and To zones.
- Press Convert Time.
How conversion works
Time zones are offsets from UTC: India is UTC+5:30 all year, the US East is UTC−5 in winter (EST) and UTC−4 in summer (EDT), the UK is UTC+0 (GMT) and UTC+1 in summer (BST). To convert: convert the source time to UTC by subtracting its offset, then add the target offset. 9:00 IST minus 5:30 is 3:30 UTC; add 1:00 for Central European Time and you get 4:30 CET. Daylight saving changes the offset on different dates in different countries, so meetings around the changeover dates in March and November can be off by an hour.
Worked example
9:00 AM IST in other zones (winter)
| UTC / London (GMT) | 3:30 AM |
| New York (EST) | 10:30 PM previous day |
| Los Angeles (PST) | 7:30 PM previous day |
| Dubai (GST) | 7:30 AM |
| Singapore | 11:30 AM |
| Tokyo | 12:30 PM |
Tips and common mistakes
- Always state the zone and city in invites.
- Check daylight-saving dates around March and November.
- India has no daylight saving.
- Use UTC for server timestamps.
- Find a window that is reasonable for everyone, then rotate who gets the inconvenient slot.
Frequently asked questions
How do I convert between time zones?
Subtract the source offset to get UTC, then add the target offset.
What is IST in UTC?
UTC+5:30.
What is the time difference between India and New York?
10.5 hours in US winter, 9.5 in summer.
Does India have daylight saving?
No.
What is UTC?
The global time standard, with no daylight saving.
Why is my meeting an hour off?
Daylight-saving dates differ by country.