Time Zone Calculator

Free online time zone converter across 34 world time zones from UTC-12 to UTC+13. Convert times between New York, London, Dubai, India, Tokyo, Sydney and more with automatic DST handling.

Convert time between any two time zones

About This Calculator

The Time Zone Calculator allows you to convert any date and time across 34 curated time zones worldwide. Whether you are scheduling international meetings, planning travel, coordinating with remote teams across different countries, or simply checking what time it is in another part of the world, this tool provides accurate time conversions using the IANA time zone database.

The converter automatically handles daylight saving time (DST) transitions, ensuring accurate results regardless of the date. The curated list includes all major business and travel time zones from UTC-12 (International Date Line West) to UTC+13 (Samoa), covering every inhabited time zone on Earth.

How to Use the Time Zone Converter

  1. Select the date and time you want to convert using the datetime-local picker (defaults to the current time).
  2. Choose the source time zone from the "From Time Zone" dropdown — this is the time zone your input time is in.
  3. Choose the target time zone from the "To Time Zone" dropdown — this is the time zone you want to convert to.
  4. Click "Convert Time" to see the equivalent time in the target zone, with the time zone abbreviation displayed.

Key Time Zone Facts

  • India (IST): UTC+5:30, no DST, used throughout India and Sri Lanka
  • US Eastern: UTC-5:00 (EST) / UTC-4:00 (EDT), DST March-November
  • UK London: UTC+0:00 (GMT) / UTC+1:00 (BST), DST March-October
  • Japan Tokyo: UTC+9:00 (JST), no DST
  • Australia Sydney: UTC+10:00 (AEST) / UTC+11:00 (AEDT), DST October-April

Regional Notes

India: India uses Indian Standard Time (IST, UTC+5:30) year-round with no daylight saving. When converting from India to the US, remember that IST is 9.5-12.5 hours ahead depending on the US time zone and DST status.

United States: The US spans multiple time zones (Eastern, Central, Mountain, Pacific, Alaska, Hawaii). Most US states observe DST from the second Sunday in March to the first Sunday in November. Arizona and Hawaii do not observe DST.

United Kingdom: The UK uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) from the last Sunday in March to the last Sunday in October.

Frequently Asked Questions

How does the time zone converter work?

The time zone converter uses JavaScript Intl.DateTimeFormat with the IANA time zone database (e.g., America/New_York, Asia/Kolkata, Europe/London) to accurately calculate the equivalent time in the target zone. It automatically accounts for daylight saving time (DST) based on the date you select.

Does the converter handle daylight saving time (DST)?

Yes, the converter automatically handles DST transitions using the IANA time zone database built into JavaScript's Intl.DateTimeFormat. Regions that observe DST like US Eastern Time, UK London, and Europe Paris are automatically adjusted based on the date you select.

What time zones are included?

This converter includes 34 carefully selected time zones covering all major regions worldwide from UTC-12 (International Date Line West) through UTC+13 (Samoa). It includes New York, London, Paris, Dubai, Mumbai (IST), Tokyo, Sydney, Auckland, and many more.

What is the time difference between India and the US?

India Standard Time (IST, UTC+5:30) is 9.5 hours ahead of US Eastern Time (ET, UTC-5) and 12.5 hours ahead of US Pacific Time (PT, UTC-8). During DST (March-November), the difference reduces by 1 hour: 9.5 hours ahead of EDT and 12.5 hours ahead of PDT.

What is the time difference between London and New York?

London (UTC+0 GMT / UTC+1 BST) is 5 hours ahead of New York (UTC-5 EST / UTC-4 EDT). During winter both are 5 hours apart. During summer when both observe DST, London remains 5 hours ahead as both clocks move forward simultaneously.

Can I convert between any two time zones in the list?

Yes, you can convert between any two time zones in the curated list of 34 zones. Simply select the source and target time zones, enter your date and time, and the converter instantly shows the equivalent time in the destination zone.

How do I read the UTC offset in parentheses?

UTC offsets (e.g., UTC+05:30) show the time difference from Coordinated Universal Time. Positive offsets are ahead of UTC (east), negative are behind (west). For example, India (UTC+5:30) is 5 hours 30 minutes ahead of UTC, while US Eastern Time (UTC-5:00) is 5 hours behind.