Time Zone Converter · World Clock · Meeting Planner
Time Zone Converter for every city, every rule
Add any cities you like, hover across the day and see everyone's local time at once — with daylight saving handled by the official IANA database.
Why True Time Converter
IANA-accurate
Every conversion uses the official IANA time zone database through your browser — daylight saving rules, including recent changes, are always current. No stale hardcoded offsets.
Business-hours aware
Off-hours, weekends and the shared working window are highlighted automatically, so you can see at a glance when everyone is awake and at their desk.
Plan & share instantly
The meeting planner ranks the best overlap times, and every view is a shareable link. Add picks to Google Calendar, Outlook or an .ics file — no account needed.
Guide
Everything you need to know about converting time zones
What a time zone converter actually does
A time zone converter answers one question: what time is it somewhere else? It sounds trivial until you try it in March. The clock in New York, the clock in London and the clock in Delhi are all correct at the same instant, but the gap between them is not a constant. It moves when one country changes its clocks and the other does not, it moves by half an hour in some places and by 45 minutes in others, and it shifts again a few weeks later when the other side of the planet adopts its own rules. A converter that stores a fixed offset table gets this right for part of the year and wrong for the rest. This one computes every value from the IANA time zone database — the same ruleset your phone, laptop and servers run on — so daylight saving, half-hour zones and recently changed legislation are handled automatically.
How to use this time zone converter
Start by adding the cities you care about. Press the “Find a city” button in the header or press / on your keyboard, then search by city, country, alternative name or raw IANA identifier — “NYC”, “New York” and “America/New_York” all land in the same place. You can compare up to twelve cities at once, which makes this a true multiple time zone converter rather than a one-pair tool.
Once the cities are on the board, the timeline shows a full 24-hour day. Each row is a city; each column is an hour in the reference city’s day. Hovering or tapping a column selects that instant everywhere at once, and the summary underneath spells it out in words: “It is 09:00 in London, 04:00 in New York and 17:00 in Singapore.” A live “now” line tracks the current moment, business hours are shaded, and weekends are marked, so you can see at a glance whether a slot lands at 3 a.m. for somebody.
Use the date controls to step backwards or forwards a day at a time, and the 12h/24h toggle to switch the whole view. That is the point of a 24 hour time zone converter: “14:00” needs no suffix in any language, which is why airlines, hospitals and technical logs use it everywhere. Every selection lives in the URL, so copying the address bar hands someone exactly the view you are looking at.
Daylight saving time is the whole problem
About two billion people in more than a hundred countries change their clocks twice a year, and the pattern is not tidy. Most of the northern hemisphere shifts in March and November; the southern hemisphere shifts the other way, in October and April, so London and Sydney disagree about the season for half the year. The United States changes its clocks on the first Sunday in November while the UK moves on the last Sunday in October, which means for about a week the gap between New York and London is six hours rather than five. Arizona, Iceland and most of Brazil never shift at all, and Morocco pauses daylight saving during Ramadan. If you want the details for one zone, see the dedicated BST time zone converter, the MST time zone converter or the Pacific time zone converter.
The time difference calculator behind the answer
The gap between two cities is simply the difference between their UTC offsets on that date. New York is UTC−5 in winter, so London (UTC+0) is five hours ahead. The arithmetic is easy; the traps are that offsets change twice a year and that not every offset is a whole number of hours. India is UTC+5:30 and Nepal is UTC+5:45, so 09:00 in London is 14:30 in Delhi, not 14:00. The time difference calculator view spells out these numbers for the exact date you select, including the day the calendar flips across the International Date Line.
A meeting planner for distributed teams
The hardest question is rarely “what time is it in Tokyo” — it is “when can five people in five cities actually talk”. The meeting planner scores all 24 hours against each participant’s working hours, penalises weekends and late nights more heavily, and ranks the five best slots, spaced apart so you are not handed six versions of the same morning. When a group spans more than about eight time zones and no civil overlap exists, the planner says so plainly instead of pretending otherwise — which is exactly what a time zone converter for meetings should tell you. Pick a slot and export it to Google Calendar, Outlook or an .ics file; the times are written in UTC underneath, so every attendee sees the correct local time. Read the full time zone converter meeting planner guide for details on recurring meetings that cross a daylight saving change.
Popular time zone converters by region
Some searches are about a specific zone rather than a generic tool. Whether you need the UTC time zone converter for server logs and flight schedules, the world time zone converter for a view of the whole planet at once, the 24-hour time zone converter for unambiguous notation, or the classic time zone converter for a plain two-city answer, each has its own page with live clocks and an hour-by-hour table.
Converting time zones with Google Calendar and Sheets
Google already has time zone features scattered across Calendar, Sheets and Search, and each works at a different level. Calendar can display a second time zone beside the primary one; Sheets has no native converter at all, so most people build one by adding UTC offsets to a base time and refresh it twice a year; Search can show the current time in a single city. None of them compares five cities, shades working hours or ranks a meeting slot, which is what the Google time zone converter guide explains in detail — including how to export a chosen slot straight into Google Calendar.
What makes this converter different
Nothing is hardcoded and nothing is stored on a server. The IANA rules are read live through your browser, your cities and preferences live in localStorage, and every view is a plain URL. The whole tool is a single static page with a few kilobytes of JavaScript — no framework, no accounts, no cookies, no ads, and nothing to install.
FAQ
Frequently asked questions about time zone conversion
What is the best time zone converter?
The best time zone converter is one that computes every value from the IANA time zone database — the same ruleset your phone, laptop and servers use — instead of a table of fixed offsets. That keeps daylight saving rules, half-hour and 45-minute offsets and recent legal changes correct without any manual updates. This converter reads those rules live in your browser, compares up to twelve cities on one 24-hour timeline, and is free with no sign-up.
How to use time zone converter?
Add the cities you want to compare with the search box (press / or Ctrl+K), pick the date, and read the answer from the timeline — each row is a city and each column is an hour. Hover or tap a column to see that instant in every city at once, use the 12h/24h toggle to switch notation, and share the URL so the other person opens exactly the view you are looking at.
How do I convert time zones?
Take the target city's UTC offset for the specific date, add it to the source time, and wrap past midnight if you cross 24 hours. For example, 14:00 UTC is 09:00 in New York (UTC−5) in winter and 10:00 (UTC−4) in summer. Manual arithmetic works, but the reliable way is an hour-by-hour converter table, because offsets change twice a year and zones such as India (UTC+5:30) and Nepal (UTC+5:45) are not whole hours.
What is my country's time zone?
Most countries sit in a single zone — Japan on JST (UTC+9), India on IST (UTC+5:30), most of Europe on CET/CEST (UTC+1/+2) — but the largest span several: Russia has eleven zones, the United States and Canada six each, and Brazil four. Search for your own city in the tool above and its zone, abbreviation and current offset appear on its clock; the Popular pages directory lists the primary zone for every country.
How do I convert time between two cities?
Add both cities to the timeline, choose the date, and read the answer from the columns — or hover a column to see the time everywhere at once. Internally it adds the UTC offset difference for that specific date, so 09:00 in New York becomes 14:00 in London in winter and 13:00 in summer, and 14:30 in Delhi.
Does this time zone converter handle daylight saving time?
Yes. Every conversion is evaluated for the date you are viewing, including the awkward weeks in March and November when one country has already changed its clocks and the other has not. The current abbreviation (PST, BST, CEST, JST…) is always shown next to the numeric UTC offset.
Can I use this time zone converter for meetings?
Yes. The meeting planner scores all 24 hours against each participant's working hours, penalises weekends and late nights, and ranks the five best slots. Any slot can be exported as a Google Calendar event, an Outlook deeplink or a downloadable .ics file.
Do I need an account to save my cities?
No. Your selected cities and display preferences are stored in your own browser via localStorage, and every view is encoded in the URL so it can be shared as a plain link. Nothing is uploaded and there are no accounts, cookies or trackers.
How many cities can I compare at once?
Up to twelve at a time, drawn from every country and time zone in the world plus a searchable index of more than 30,000 cities. You can search by city name, country, common alias such as "NYC" or "L.A.", or by raw IANA zone id.
Is this a free alternative to the Google time zone converter?
Yes, and it does considerably more. Google Search can show the current time in a single city, Google Calendar can display a second time zone beside the primary one, and Google Sheets has no native converter at all — most people build one by adding UTC offsets to a base time and refreshing it twice a year. This tool compares up to twelve cities on one timeline, shades working hours, ranks meeting slots and exports straight to Google Calendar, Outlook or an .ics file. No sign-up, no cookies, no ads.
What is the best time zone converter for comparing multiple cities?
One that reads the IANA time zone database instead of a fixed offset table, handles the half-hour and 45-minute zones correctly, and shows a full 24-hour day rather than a cropped window. This is a multiple time zone converter: add up to twelve cities, hover across the day and see everyone's local time at once, with the current abbreviation — PST, BST, CEST, JST — always shown beside the numeric offset.
What time is it in Pacific Time right now?
The live clocks on this page update in your browser, so the current Pacific Standard Time (PST, UTC−8) or Pacific Daylight Time (PDT, UTC−7) is always on screen along with the offset. Note that Phoenix and most of Arizona stay on Mountain Standard Time all year, and Hawaii stays on HST, so neither follows the Pacific clock during the summer.
What is the GMT time zone converter?
GMT (Greenwich Mean Time) is the winter civil time of the United Kingdom, at UTC+0. A GMT time zone converter takes a time in GMT and translates it into your local clock, or the reverse, using the correct offset for the date you pick. Because the UK switches to British Summer Time (BST, UTC+1) between late March and late October, the converter reads the live IANA rules and always knows whether London is currently on GMT or BST — add London to the timeline above to see both.
Which country has GMT time zone?
The United Kingdom keeps GMT (UTC+0) from late October to late March, and Ireland does the same in winter. A group of countries near the Greenwich meridian stay on UTC+0 all year with no daylight saving: Iceland, Ghana, Senegal, Gambia, Guinea, Guinea-Bissau, Sierra Leone, Liberia, Ivory Coast, Mali, Burkina Faso, Togo, Mauritania and São Tomé and Príncipe. In summer the UK and Ireland move one hour ahead to BST/IST while those countries stay on GMT.
Is GMT the same as UTC?
For almost every practical purpose, yes — but strictly, no. GMT is a time zone: the civil time kept at Greenwich, encoded in the IANA database as Europe/London, and it becomes UTC+1 during British Summer Time. UTC is the fixed reference standard with a zero offset and no daylight saving, used by computers, aviation and science. The two agree for roughly half the year; for the other half London is one hour ahead of UTC. If someone says "GMT+1" in July, they almost certainly mean UTC+1.
What does UTC stand for?
UTC stands for Coordinated Universal Time. The letters are an international compromise between the English "CUT" and the French "TUC" (Temps Universel Coordonné), so the abbreviation reads the same in every language. It is the zero-offset reference standard that every other time zone is measured against.
What is the UTC timezone?
UTC is the world's reference clock: an atomic-clock standard with a zero offset that never shifts for daylight saving. Every other time zone is expressed as an offset from it — UTC−8, UTC+4, UTC+5:30 — and servers, databases and APIs store timestamps in UTC so that a single unambiguous instant survives wherever the reader is. In the IANA database "UTC" is its own zone id, and the UTC time zone converter page on this site shows a live UTC clock beside an hour-by-hour offset table.
Which countries are in the GMT+4 time zone?
UTC+4 covers the Gulf and part of the Caucasus: the United Arab Emirates (Dubai, Abu Dhabi), Oman, Azerbaijan, Georgia, Armenia, Réunion, Mauritius and the Seychelles, plus Russia's Samara region. None of them observes daylight saving, so the offset holds all year. The neighbouring Gulf states — Saudi Arabia, Qatar, Bahrain, Kuwait and Iraq — sit one hour behind at UTC+3, and Iran runs at UTC+3:30.
Is my current timezone GMT?
Only if you are in the UK in winter, in Iceland, or in one of the West African countries that stay on UTC+0. The quickest check is to compare your device clock with the live UTC clock on this page — the difference is your exact offset. Your device settings name the zone precisely: Windows lists the selected zone with its base UTC offset and daylight saving state, and macOS names the IANA zone after a city such as London or New York. Remember the UK is on GMT only from late October to late March; the rest of the year it is BST (UTC+1).
How to convert UTC to local time?
Find your city's UTC offset for the date you are converting, add it to the UTC time, and wrap around midnight if you cross 24 hours. For example, 14:00 UTC is 09:00 in New York (UTC−5) in winter and 10:00 (UTC−4) in summer, 15:00 in Berlin (UTC+1) in winter or 16:00 (UTC+2) in summer, and 23:00 in Tokyo (UTC+9) all year. The live UTC clock and the hour-by-hour offset table on this page show the exact numbers for any date you select.