How to use the World Time Finder
Type the question the way you would say it out loud. “What time is it in Tokyo?”, “Current time in New York”, “Time in London now” and plain “Helsinki” all resolve to the same kind of answer, because the search strips the conversational wrapper and matches the location that remains. Suggestions appear as you type, so you can select a location with the arrow keys and Enter rather than finishing the sentence.
The result card shows the live local time and date, the weekday, the official IANA zone name, the current UTC offset, the zone abbreviation where one is reliably published, whether daylight saving is in force, and how far ahead of or behind your own clock the location sits. If the searched place has already rolled over into tomorrow — or is still on yesterday — the card says so explicitly, which is the detail most people get wrong when booking calls across the Pacific.
How world time zones work
The world is divided into time zones that are, in principle, one hour apart, anchored to the prime meridian in Greenwich. In practice the map is political rather than geometric. India runs half an hour off the grid at UTC+05:30, Nepal a further quarter hour at UTC+05:45, and China keeps a single zone across a landmass that would geographically span five. Because of the International Date Line, roughly 26 hours of clock time exist simultaneously, which is why two different calendar dates are always in progress somewhere.
Software solves this with the IANA time zone database — identifiers such as America/New_York, Europe/Helsinki and Asia/Kolkata that carry the full history of a region's offsets and daylight saving rules. This page resolves every search to one of those identifiers and asks your browser's own copy of that database for the answer. Nothing on the page assumes a permanent fixed difference between two cities, because those differences are not permanent.
UTC offsets and daylight saving time
A UTC offset describes how far a local clock runs ahead of or behind Coordinated Universal Time. Helsinki is UTC+02:00 in winter and UTC+03:00 in summer; New York is UTC−05:00 in winter and UTC−04:00 in summer. The switch dates do not line up: North America moves in mid-March and early November, Europe on the last Sundays of March and October, and most of Asia, Africa and South America do not change at all. For about three weeks each spring and autumn, the gap between Europe and North America is therefore one hour smaller or larger than people expect.
Southern-hemisphere daylight saving runs on the opposite schedule, so Sydney gains an hour while Europe loses one. The finder handles all of this silently: the offset displayed is computed for the current instant, and the daylight-saving row tells you whether the location is on standard or summer time right now, so you can see at a glance whether an unusual gap is about to correct itself.
How to compare time between cities
Your own clock is shown alongside every result, so a single search is already a comparison. Use the swap button to reverse the two cards when you want to think in the other location's frame of reference — useful when you are writing to a colleague and want to phrase the time the way they will read it. The difference row is always expressed relative to you: “7 hours ahead of you” means adding seven hours to your clock gives their clock.
When you need to compare a specific future date and time rather than right now, move over to the Time Zone Converter, which converts any chosen moment between two cities, or the Meeting Planner, which highlights the hours that fall inside working hours on both sides.