Eastern, Central, Mountain & Pacific — every US zone, plus the world, DST included.
A time today in one zone, shown in another — DST applied automatically.
The current offset between any two zones, right now.
The time zone converter answers the "what time is it there?" question three ways: convert a specific time from one zone to another, check the current offset between two cities, and watch a live world clock colored by local time of day. Conversions come from your browser's IANA time zone database, so daylight saving rules are applied automatically for today's date — and, as with every Time Ledger tool, nothing you enter leaves your browser.
Each zone is an offset from UTC, so conversion is two hops:
UTC = Local A − Offset A Local B = UTC + Offset B
9:00 AM in New York (GMT−4) is 1:00 PM UTC, which is 10:00 PM in Tokyo (GMT+9).
The gap between two zones is just their offsets subtracted:
Difference = Offset B − Offset A Tokyo − New York = +13 hrs
The sign tells you who's ahead; differences can include half hours, like India's +5:30.
Offsets shift with the seasons in many zones:
New York: GMT−5 (winter) GMT−4 (summer)
The converter reads current DST rules from your browser, so you never adjust manually.
Yes. Conversions use your browser's IANA time zone database — the same one operating systems use — which applies each zone's daylight saving rules automatically for today's date. When New York is on summer time and Tokyo (which has no DST) isn't, the 13-hour gap is reflected without you doing anything.
For everyday purposes they're the same thing: the reference time at zero offset. UTC (Coordinated Universal Time) is the modern technical standard kept by atomic clocks; GMT (Greenwich Mean Time) is the older name that survives in offset labels like GMT+5. This page uses GMT-style labels because they're the most familiar.
Offsets don't have to be whole hours. India runs on GMT+5:30, parts of Australia on GMT+9:30, and Nepal on GMT+5:45. The converter and the difference card handle these fractional offsets exactly — a call from London to New Delhi crosses a 5½-hour gap.
When the zone gap pushes a time past midnight, the calendar date changes: 9:00 PM Tuesday in New York is already 11:00 AM Wednesday in Sydney. The converter marks this with +1 day (or −1 day going the other way) so you never book a call on the wrong date.
They pair naturally: convert a shift's start and end to your zone here, measure it with the work hours calculator, log the week in the time card calculator, or write it in 24-hour form with the military time converter.
Results are estimates for general guidance only and are not professional advice. Please double-check anything that affects pay, safety, or spending — see our full disclaimer.