How this calculator works
- Step 1Wall timedate and timeAs shown on a clock in the first zone.
- Step 2UTCminus the offsetThe offset on that date, daylight saving included.
- Step 3Other zoneplus its offsetIts offset at that same instant.
Every zone is some hours and minutes ahead of or behind UTC. India is always 5 hours 30 minutes ahead, but many other places change their offset for daylight saving.
The calculator reads each zone’s offset for the exact date from the IANA time zone database built into your browser, so clock changes are handled.
Worked example: 9:00 in India to New York
- New York
IST − 5:30 + New York offset
- IndiaUTC +05:3009:00 on 2026-11-04
- UTC09:00 − 5:3003:30 on 2026-11-04
- New York offset−05:00
- New York22:30 on 2026-11-03
In July the same 9:00 in India is 23:30 on 2026-06-30 in New York, an hour later, because New York is on daylight saving time.
Read the result
- Skipped timedoes not exist02:30 on 8 March 2026 in New York: clocks jump an hour, skipping 60 minutes.
- Repeated time11:00 or 12:0001:30 on 1 November 2026 in New York happens twice; both are shown in India time.
Not every offset is whole hours. Nepal is 15 min ahead of India: 9:00 IST is 09:15 on 2026-11-04 in Kathmandu.
Assumptions and limits
- IANA databaseThe standard zone rules your browser ships with.
- Date-awareEach zone’s offset on the chosen date.
- Future rulesGovernments can change rules; browsers update the data.
- Cities, not countriesLarge countries have several zones; pick the right city.
Related time tools
Time zones shift the clock. Timestamps and durations are other ways to handle time.
To read or make a Unix timestamp, use the Unix timestamp converter. The time calculator adds or subtracts durations, and the cron expression explainer shows schedule times in IST and UTC.
Common mistakes
Mistake: Assuming the US is always 9 h 30 min behind India.
Instead: It is 10 h 30 min in winter and 9 h 30 min in summer for New York.
Mistake: Ignoring the date when converting.
Instead: Late-evening times in India are often the previous day in the Americas.
Mistake: Scheduling across a clock change by memory.
Instead: Check the exact date; changes happen on different weekends in the US and Europe.
Checking the method
A separate script re-works every golden value with Python’s zoneinfo, including the skipped and repeated New York times.
Read how we test our calculators, or browse more everyday tools.