🌍 Time zone

Time Zone Converter

Enter a date and time, pick where it happens and where you want to see it. Daylight saving is applied automatically for the exact date you choose. Press Convert.

Written and reviewed by SM Arijul Islam · Last reviewed 28 October 2026 · Editorial standards · Report an error

About the time zone converter

Time zones are not fixed offsets. They are rules — a base offset plus a set of daylight saving dates that governments change more often than most people expect. That is why this converter works from your chosen date rather than from a table of offsets: the same city can be eight hours ahead of you in July and nine hours ahead in January.

Every calculation here uses the browser's own time zone database, so daylight saving transitions, half-hour offsets such as India and Newfoundland, and the special cases like Nepal's 45-minute offset are all handled correctly.

How daylight saving shifts the picture

Example offsets that change with daylight saving
Pair	Northern winter	Northern summer
New York to London	5 hours	5 hours (both change)
New York to Berlin	6 hours	6 hours (both change)
London to Sydney	11 hours	9 hours
Los Angeles to Tokyo	17 hours	16 hours
London to Phoenix	7 hours	8 hours (Phoenix has no DST)

Reading the result

Offset shows how far a zone is from UTC at that exact moment, such as UTC+05:30 for India.
Abbreviation is the short code in use, like EST or CET. It changes when daylight saving starts.
Day change matters for meetings: a 9 pm call in New York is already tomorrow in Tokyo.
The table below the result repeats the same instant in major cities, which is the quickest way to pick a call time.

Planning a meeting across zones

Work backwards from the awkward end. If everyone must be awake between 08:00 and 20:00 local time, find the overlap of those windows rather than converting a single chosen hour. Asia to the Americas is the hardest combination, because the two regions barely overlap during a working day; Europe and the Americas overlap comfortably in the European afternoon.

Frequently asked questions

Why do some zones differ by 30 or 45 minutes?

Not every country chose a whole-hour offset from UTC. India is UTC+05:30, Nepal is UTC+05:45, and parts of Australia use half-hour offsets. The converter keeps those exactly.

What if the time I enter does not exist?

Clocks jump forward on the spring transition, so a local time such as 02:30 may simply never happen that day. The converter will still return a result and note that the time falls in a daylight saving gap.

What happens in the autumn overlap?

When clocks go back, 01:30 happens twice. The converter uses the first occurrence, the one before the transition.

Is this the same as UTC offset?

A UTC offset is a single fixed number, while a time zone is the full set of rules. Two places can share an offset today and diverge next month when one of them changes its clocks.

What is CET in IST?

CET is UTC+1 and IST is UTC+5:30, so CET is 4 hours 30 minutes behind Indian Standard Time. In summer, CEST is UTC+2 and the gap is 3 hours 30 minutes.

What is 9am PST in EST?

09:00 PST is 12:00 EST on the same date. PST is UTC−8 and EST is UTC−5, a three-hour difference. This assumes both zones are on standard time.

What is 12pm GMT in EST?

12:00 GMT is 07:00 EST on the same date. GMT is UTC+0 and EST is UTC−5, a five-hour difference. In summer the UK uses BST and the US uses EDT, so the gap is usually four hours.

Common mistakes to avoid

Assuming a fixed offset all year. Confirm the result for the actual date before sending a calendar invite.
Confusing UTC with GMT in everyday use — they agree in practice, but UTC is the standard and never shifts.
Forgetting the day change. A late-evening call in the Americas lands tomorrow in Asia and Oceania.
Trusting the abbreviation alone. IST means Indian Standard Time in one country and Irish Standard Time in another.

Sources and standards

Time zone offsets and daylight-saving rules come from the IANA time zone database, the same source most operating systems use. Governments change those rules, so the page reports the offset for the date you enter rather than a single fixed number.

IANA — Time Zone Database