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Time Zone Converter

Pick a date and time in any time zone and see the same moment in your local zone, UTC, India, London, New York, Los Angeles, Singapore, Tokyo, Sydney and any other zone you add. Each row shows the UTC offset and whether the date rolls over to the next or previous day, with daylight-saving handled automatically.

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How to use the time zone converter

  1. Set the date and time (your current local time is filled in) and choose the zone that time belongs to.
  2. Read the converted time in each zone. A +1 or −1 marker means the calendar date is different there.
  3. Search for a city or region to add more zones, or remove ones you don't need. Use “Restore defaults” to bring them back.
  4. Copy one row or all rows to paste into a meeting invite or message.

Features

  • Convert from any IANA zone to any number of others at once
  • UTC offset, abbreviation and hours ahead/behind for every zone
  • Day-change indicator (+1 / −1) for overnight differences
  • Daylight-saving time applied correctly for the chosen date
  • Searchable list of every zone your browser knows; no libraries, nothing uploaded

How the conversion works

The date and time you enter, together with the source zone, define one instant. That instant is then formatted in each target zone using your browser's built-in time-zone database (the same one used by Intl.DateTimeFormat), which knows every zone's current and historical daylight-saving rules. The offset is measured for the exact instant, so a London time in July shows UTC+01:00 and in January shows UTC+00:00.

Worked example: 10:00 in Asia/Kolkata (UTC+05:30) is 04:30 UTC, 05:30 in London during summer, 00:30 the same day in New York (EDT), 13:30 in Tokyo and 14:30 in Sydney in winter. From Los Angeles at 22:00, India is already 11:30 the next morning, which the +1 marker shows.

Zone names versus abbreviations

Abbreviations like IST, CST or EST are ambiguous: IST is used for India, Israel and Ireland, and CST for Central US, China and Cuba. Always convert with the IANA zone name (Asia/Kolkata, America/Chicago), which is unambiguous and carries the daylight-saving rules. Some browsers list India as Asia/Calcutta; both names refer to the same zone.

Limits

If you enter a time that doesn't exist because clocks jumped forward, the tool uses the instant just after the gap. A time that occurs twice when clocks fall back resolves to one of the two possibilities. Future daylight-saving changes announced after your browser was last updated will not be reflected. Times are shown in 24-hour format.

Frequently asked questions

How do I convert UTC to IST?

Choose UTC as the source zone, enter the time, and read the Asia/Kolkata row. India is UTC+05:30 all year, so 12:00 UTC is 17:30 IST. Going the other way, pick Asia/Kolkata as the source and read the UTC row.

What does the +1 next to a time mean?

The calendar date in that zone is one day later than in the source zone (−1 means one day earlier). It's easy to miss when scheduling: 22:00 on Monday in Los Angeles is Tuesday morning in India.

Does the converter handle daylight saving time?

Yes. Offsets are computed for the specific date you choose, so zones that observe DST (London, New York, Sydney and many others) show the correct summer or winter offset. India, Japan and Singapore don't use DST and stay fixed.

Why isn't my city in the list?

IANA zones are named after the largest city in each zone region, so search for a nearby major city or the country's capital. Mumbai and Delhi are both Asia/Kolkata; Bengaluru too. Underscores in names are shown as spaces.

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