Time Zone Converter
Convert any time and date between world time zones — daylight saving handled automatically
Daylight saving time is handled automatically using your browser's built-in time-zone data — the offset shown reflects DST rules for the exact date you pick.
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Quick summary
Pick a date, a time, and two zones to convert between them. The result shows the converted time, rolls the date forward or back when the conversion crosses midnight, and lists each side's UTC offset. Daylight saving is applied automatically for the exact date you choose — New York is UTC−4 in July but UTC−5 in January — using your browser's built-in time-zone database. No account, no server call.
Reviewed by Simple Calculators TeamLast reviewed
How to use this calculator
- Set the Date and the Time (in the source zone) you want to convert.
- Choose the source city in From Zone.
- Choose the destination in To Zone, or press the Swap zones button to reverse the direction.
- Read the Converted Time, then check the line beneath it for the target date, a "(next day)" or "(previous day)" note, and the hour difference versus the source.
- Compare the Source Offset and Target Offset boxes to see each zone's offset from UTC (GMT) on that date, with daylight saving applied.
Frequently asked questions
How do I convert time between time zones?
Enter the Date and Time in the source zone, pick the From Zone and To Zone, and read the Converted Time. The tool works out the exact UTC offset of each zone on that date, including daylight saving, and notes when the result falls on the next or previous calendar day. You can swap the zones with one click.
Does this handle daylight saving time?
Yes, automatically. A zone's offset depends on the date, because many regions shift their clocks by an hour twice a year, on different dates. The converter looks up the correct offset for the specific date you enter, so a July conversion and a January conversion between the same two cities can differ by an hour.
Why does the converted date sometimes change?
The date changes when the conversion crosses midnight. Converting 8:00 PM on July 15 in New York to Tokyo gives 9:00 AM on July 16, because Tokyo is 13 hours ahead of New York in summer, and the result is marked "(next day)". Converting westward late at night can likewise land on the previous day.
What is the time difference between New York and India?
India is 9 hours 30 minutes ahead of New York while New York observes daylight saving time (roughly March to November), and 10 hours 30 minutes ahead the rest of the year, because India does not change its clocks. So 9:00 AM in New York is 6:30 PM in India in July and 7:30 PM in January.
Why are some UTC offsets not whole hours?
Some countries set their clocks to a half-hour or other fraction of an hour from UTC. India, for example, is UTC+5:30 year-round, which the converter shows as GMT+5:30. That's why a conversion involving India can land on a half hour, and why the hour difference shown can be a decimal such as +9.5h.
What is UTC?
UTC (Coordinated Universal Time) is the global time standard that every time zone is defined against, written as offsets such as GMT−5 or GMT+9. UTC itself never observes daylight saving, which makes it a stable anchor for scheduling across regions. The converter shows each zone's UTC offset for the chosen date, and UTC is one of the selectable zones.
Which time zones can I choose?
The menus list 19 major cities across North America, South America, Europe, Africa, Asia, Australia, and New Zealand, plus UTC. Each one uses its standard IANA time-zone identifier, such as America/New_York, so daylight saving rules are applied correctly. If your city isn't listed, pick a city that shares its time zone.
Key terms
- UTC Offset
- How many hours a zone is ahead of or behind UTC (e.g., GMT+5:30 for India).
- Daylight Saving Time
- The seasonal one-hour shift many regions observe; changes a zone's offset by date.
- IANA Time Zone
- The standard zone identifiers (e.g., America/New_York) that carry each region's full DST history.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.