Convert a time between zones. Handles daylight saving.
You type a wall-clock time, such as 9:00 on 8 October 2026, and say which zone it is in. The tool works out the one moment in time that this means, then shows what the clock reads in every zone on your list at that moment. A zone is an offset from UTC that can change during the year, so the tool looks up the offset that applies on that date, not today's. Kolkata is UTC+5:30 all year. New York is UTC-4 on 8 October and UTC-5 in January. Some zones sit on a half hour or a 45 minute offset, such as Adelaide in winter at UTC+9:30 and Kathmandu at UTC+5:45, and these are shown as they are. When the result falls on a different calendar date from the one you typed, a chip says +1 day or -1 day. Changing the source zone keeps the date and time you typed and reads them in the new zone. The date must be between 1970 and 2100. Zones are chosen by city or region name, and the zone list comes from your browser, so a very new zone may be missing on an old browser.
Twice a year the clocks in many zones change, and two kinds of wall-clock time cause trouble. When clocks jump forward, one hour never happens. In New York on 8 March 2026 the clock goes from 2:00 straight to 3:00, so 2:30 AM does not exist. The tool tells you so and shows 3:30 AM, which is the same moment moved forward by the size of the jump. When clocks go back, one hour happens twice. In New York on 1 November 2026, 1:30 AM comes once at UTC-4 and again an hour later at UTC-5. The tool shows the first one and offers a link to switch to the second. Sydney does the same in the other season: its clocks go back on 5 April 2026 and forward on 4 October 2026. The date a change happens differs by country, so the tool reads the rules your browser carries rather than a fixed table. Dates before 1970 and after 2100 are not covered, and the tool does not plan a meeting slot that suits everyone on the list.
IST can mean India Standard Time, Irish Summer Time or Israel Standard Time. CST can mean Central Standard Time in the United States, China Standard Time or Cuba Standard Time. BST is British Summer Time in some places and Bangladesh Standard Time in others. Because one abbreviation can point to different zones with different offsets, converting from it would give a wrong answer for some people without any warning. So the tool does not accept abbreviations as input. Type a city instead, such as Kolkata, Bangalore, New York or Sydney, and the picker offers the matching zone. Common city names and a few country names are matched, and any zone your browser knows can be found by its region and city name, such as Asia/Kolkata. UTC and GMT are accepted because each names a single zone. Results are labelled with the offset, for example UTC+5:30, so there is no doubt which one is meant.
The conversion runs in your browser using its built-in time zone data. There is no upload step and no server that receives the date, time or zones you enter. The page counts visits with Google Analytics, using only the name of the tool and the fact that a result appeared, never the date, the time or a zone. The list of zones you compare and the 12 or 24 hour setting are saved in this browser's local storage so they are there on your next visit. The date and time you type are not saved. If your browser blocks storage, the list goes back to the six starting zones each visit and the tool tells you so. Press Reset to clear the saved settings. Copy as text puts one line per zone on your clipboard, ready to paste into a message or an invite.
The tool says the time does not exist and shows the next valid one. In New York, 2:30 AM on 8 March 2026 is skipped because the clock jumps from 2:00 to 3:00, so it shows 3:30 AM. The same thing happens in Sydney on 4 October 2026.
The first occurrence is used and a banner explains it. In New York, 1:30 AM on 1 November 2026 happens at UTC-4 and again at UTC-5. Press the Use the second link to switch to the later one; every zone on the list updates.
It works for any zone your browser lists, plus UTC. Type a city such as Bangalore, Lagos or Auckland. If your city is not found, type the main city of its region, because zones are named after one city per region.
One abbreviation can mean several zones. IST is India, Ireland or Israel, and CST is the United States, China or Cuba. The offsets differ, so a conversion from an abbreviation could be hours out. Type a city name instead, for example Kolkata or Chicago.
No. The conversion uses your browser's own time zone data in this tab. The date and time you type are not saved. Only your list of zones and the 12 or 24 hour choice are saved, in this browser's local storage, and they are never uploaded.
Up to 12 target zones, with no duplicates. The tool starts with six: UTC, New York, London, Kolkata, Singapore and Sydney. Remove any you do not need and add your own; the list is remembered on this device.