Time Zone Converter
Convert a time between any cities or time zones, with daylight saving applied automatically for the date you pick.
How it works
The converter turns a wall-clock reading in one place into the same instant expressed elsewhere. It resolves the date and time you enter into a single moment using the source zone's rules, then formats that moment in every destination. Because everything derives from one instant, the destinations cannot disagree with each other.
Daylight saving is applied by rule rather than by a stored offset, so a conversion in July and the same conversion in December give different answers where they should. Rules come from the IANA database in your browser, which means a government's recent change is picked up as soon as the browser updates.
Two moments each year are genuinely awkward. When clocks go forward, an hour does not exist; when they go back, an hour occurs twice. Rather than silently choosing, the converter tells you which case you have hit and what it did about it.
Examples
A 6:30pm call out of New Delhi. India keeps UTC+5:30 all year. New York is UTC−4 in summer and UTC−5 in winter, so the same 18:30 arrives at 09:00 in New York during the summer and 08:00 once the clocks have gone back. The gap between the two cities is not a constant, which is exactly why converting from memory fails twice a year.
Announcing one moment in several places. Enter the instant once and add every destination. All of them are derived from the same moment, so they cannot drift apart the way separately calculated times do.
Passing the result on. Each conversion is written into the address bar, so the link you copy reproduces precisely what you were looking at — no screenshot, and no argument about which date you meant.
Practical notes
The commonest mistake this tool prevents is converting with a remembered offset. "New York is five hours behind London" is true for most of the year and wrong for two stretches of it, because the two countries change their clocks on different dates. Entering the actual date is what makes the answer reliable.
Watch the date line in the result. A conversion between, say, Los Angeles and Sydney frequently lands on a different calendar day, and a meeting agreed as "Tuesday" can be Wednesday at the other end.
Where a conversion falls on a clock-change night, the tool says so rather than guessing. An hour that is skipped has no valid local reading at all, and an hour that repeats has two — neither can be resolved without deciding which you meant, so the tool asks rather than assumes.
Frequently asked questions
Does the converter handle daylight saving time?
Yes. It uses the daylight saving rules for the specific date you enter, not just today’s offset, so a conversion for a date in another season is still correct.
What happens on the night the clocks change?
Times that are skipped by a spring-forward transition are resolved to the instant immediately after the change. Times that occur twice in an autumn transition resolve to the first occurrence.
Can I convert more than two zones at once?
Yes — add as many destinations as you like and they are all converted from the same source moment.
Which time zone names can I type?
City names, country names, abbreviations such as IST or PST, and full IANA identifiers such as Australia/Sydney.
Why has the difference changed since last month?
One of the two places changed its clocks. The gap between any pair of zones is only constant when neither observes daylight saving, or when both switch on the same date — which they generally do not.
Can I convert to several places at once?
Yes. Add as many destinations as you need; all of them derive from the same instant, so they cannot disagree with one another.
What happens on a clock-change night?
The converter tells you. An hour that is skipped has no valid local reading, and an hour that repeats has two, so it reports which case you hit rather than guessing.
Does it handle half-hour offsets?
Yes. India, Nepal, parts of Australia and Newfoundland all use fractional offsets and are converted exactly like any other zone.
Can I convert a past date?
Yes, and historical rules are applied, so a date from before a country changed its rules converts correctly.
Guides on this topic
- How daylight saving time works What happens to the clock when DST starts and ends, why one night has 23 hours and another 25, which countries change and when, and the mistakes that follow.
- UTC and GMT: the same time, for different reasons Why UTC and GMT are usually treated as the same, where they genuinely differ, what leap seconds have to do with it, and which one to write in software.
- How to schedule a meeting across time zones How to find hours that work for two or three cities, why some pairs have no overlap, the weeks when DST breaks standing meetings, and how to write a time clearly.
Related tools
- World Clock Live local time in as many cities as you need.
- Time Difference Calculator How many hours ahead or behind two places are, right now.
- Meeting Planner Find an hour that works across several time zones.
- Event Time Announcer Announce one moment in every attendee’s local time.
- Unix Timestamp Converter Live epoch clock and conversion both ways.