Does ClockUnit's world clock update in real time?
Yes. All clocks tick every second directly using your device's system clock and the Intl API — no server requests needed.
Your clocks
Track local time alongside the cities you care about.
🌐
UTC
Local
22:18:39
Wed, May 20
UTCUTC+0
Need to schedule a meeting?
Use the Meeting Planner to find the best time across multiple time zones — ideal for remote teams, global calls, and international scheduling.
Time zone directory
Current time around the world
Browse city clock pages, compare popular business hubs, and jump straight into dedicated SEO pages for the places people search most.
🇺🇸
New York
United States
18:18
UTC-4
🇬🇧
London
United Kingdom
23:18
UTC+1
🇯🇵
Tokyo
Japan
07:18
UTC+9
🇫🇷
Paris
France
00:18
UTC+2
🇦🇪
Dubai
UAE
02:18
UTC+4
🇸🇬
Singapore
Singapore
06:18
UTC+8
🇦🇺
Sydney
Australia
08:18
UTC+10
🇺🇸
Los Angeles
United States
15:18
UTC-7
🇺🇸
Chicago
United States
17:18
UTC-5
🇨🇦
Toronto
Canada
18:18
UTC-4
🇩🇪
Berlin
Germany
00:18
UTC+2
🇷🇺
Moscow
Russia
01:18
UTC+3
🇮🇳
Mumbai
India
03:48
UTC+5:30
🇨🇳
Shanghai
China
06:18
UTC+8
🇭🇰
Hong Kong
China
06:18
UTC+8
🇧🇷
São Paulo
Brazil
19:18
UTC-3
🇪🇬
Cairo
Egypt
01:18
UTC+3
🇿🇦
Johannesburg
South Africa
00:18
UTC+2
🇰🇷
Seoul
South Korea
07:18
UTC+9
🇹🇷
Istanbul
Turkey
01:18
UTC+3
🇳🇱
Amsterdam
Netherlands
00:18
UTC+2
🇬🇷
Athens
Greece
01:18
UTC+3
🇹🇭
Bangkok
Thailand
05:18
UTC+7
🇨🇳
Beijing
China
06:18
UTC+8
🇧🇪
Brussels
Belgium
00:18
UTC+2
🇦🇷
Buenos Aires
Argentina
19:18
UTC-3
🇩🇰
Copenhagen
Denmark
00:18
UTC+2
🇮🇪
Dublin
Ireland
23:18
UTC+1
🇫🇮
Helsinki
Finland
01:18
UTC+3
🇻🇳
Ho Chi Minh City
Vietnam
05:18
UTC+7
🇺🇸
Honolulu
United States
12:18
UTC-10
🇮🇩
Jakarta
Indonesia
05:18
UTC+7
🇵🇰
Karachi
Pakistan
03:18
UTC+5
🇲🇾
Kuala Lumpur
Malaysia
06:18
UTC+8
🇳🇬
Lagos
Nigeria
23:18
UTC+1
🇵🇪
Lima
Peru
17:18
UTC-5
🇵🇹
Lisbon
Portugal
23:18
UTC+1
🇪🇸
Madrid
Spain
00:18
UTC+2
🇵🇭
Manila
Philippines
06:18
UTC+8
🇦🇺
Melbourne
Australia
08:18
UTC+10
🇲🇽
Mexico City
Mexico
16:18
UTC-6
🇰🇪
Nairobi
Kenya
01:18
UTC+3
🇳🇴
Oslo
Norway
00:18
UTC+2
🇦🇺
Perth
Australia
06:18
UTC+8
🇨🇿
Prague
Czech Republic
00:18
UTC+2
🇸🇦
Riyadh
Saudi Arabia
01:18
UTC+3
🇮🇹
Rome
Italy
00:18
UTC+2
🇸🇪
Stockholm
Sweden
00:18
UTC+2
🇹🇼
Taipei
Taiwan
06:18
UTC+8
🇮🇷
Tehran
Iran
01:48
UTC+3:30
World Clock
What is a World Clock?
A world clock displays the current local time in multiple time zones simultaneously, letting you compare times across cities with a single glance. It eliminates the mental arithmetic of UTC offsets and daylight saving adjustments.
How it works
How to use ClockUnit World Clock
Three quick steps to track and compare time zones cleanly.
01
Add your cities
Click Add Clock and search for any of the supported cities worldwide. Your board is saved automatically and reused in Meeting Planner.
02
Watch them tick
Each card shows live local time, the current date, timezone abbreviation, and UTC offset, updated directly in your browser.
03
Plan meetings
Open Meeting Planner with the same saved cities, pick a date and time, and compare everyone's schedule without re-entering zones.
Features
Features
⚡
Live, second-by-second
All clocks update every second directly from your browser — no network requests needed.
🌍
50+ cities worldwide
Every major timezone represented, from Honolulu to Auckland, New York to Tokyo.
🌅
Day/night indicator
Each card shows a sun or moon icon so you can instantly tell whether a city is in business hours.
📋
Meeting Planner
Enter a local meeting time and see the equivalent time in all your saved cities at once.
🔖
Persistent board
Your clock selection is saved to your browser. It'll be there every time you return.
⚙️
12 / 24-hour format
Toggle between 12-hour (AM/PM) and 24-hour display with a single click.
🗓️
Date display
See the local weekday and date beneath each clock — essential when crossing the international date line.
📍
Auto-detect local time
Your local timezone is automatically detected and pinned at the top of the board as a reference.
Use cases
Who uses a world clock?
💻
Remote teams
Distributed companies track clocks for every team member's city to schedule stand-ups, reviews, and deadlines fairly.
📈
Traders & investors
Financial markets open and close at specific local times. Traders track New York, London, Tokyo, and Hong Kong simultaneously.
✈️
Frequent travellers
Jetsetters add their next destination to the board before departure so they can see local time before landing.
👨👩👧
Long-distance families
People with relatives abroad track their home city alongside their current location to know when to call.
🎮
Online gamers
Multiplayer games span continents. Knowing teammate time zones helps schedule raids and ranked sessions.
📰
Journalists & media
Breaking news happens at all hours. Reporters track source cities to gauge whether to call contacts at a reasonable hour.
Concepts
Understanding time zones
What is UTC?
Coordinated Universal Time (UTC) is the global time standard. Every timezone is expressed as an offset from UTC — e.g. New York is UTC−5 in winter and Tokyo is UTC+9.
What is daylight saving time?
DST is the practice of advancing clocks by one hour in spring to extend evening daylight. Not all countries observe it — Japan, China, India, and most of the Middle East and Africa do not.
Why do some timezones have half-hour offsets?
Countries like India (UTC+5:30), Iran (UTC+3:30), and Nepal (UTC+5:45) chose fractional offsets to align better with their solar time while using a single national zone.
What is the International Date Line?
The IDL runs through the Pacific Ocean at roughly 180° longitude. Crossing it eastward moves you back a day; westward moves you forward. Auckland is nearly always one calendar day ahead of Los Angeles.
What are IANA timezone identifiers?
IANA IDs (like 'America/New_York') are standardised timezone names used by computers worldwide. They encode both the UTC offset and the historical DST rules for that location.
Why do clock changes happen on different dates?
The US, EU, and other regions change clocks on different Sundays. This creates a 1–3 week window each year when the offset between, say, New York and London temporarily differs from the usual.
FAQ
Frequently asked questions
Does it automatically handle daylight saving?
Yes. The Intl.DateTimeFormat API resolves DST rules automatically for each IANA timezone, so the displayed time is always correct.
Can I save my clock board?
Yes. Your selected cities are persisted in your browser's localStorage and will be restored when you return to the page.
How many clocks can I add?
There is no hard limit. Add as many cities as you need — the grid will scroll to accommodate them all.
What does the sun/moon icon mean?
The icon indicates whether a city is currently in daytime (06:00–19:59 local) or night-time. It helps you gauge business hours at a glance.
Does ClockUnit track my location?
No. Your local timezone is detected from your browser's Intl API (a privacy-safe standard available in all modern browsers) — no GPS or network requests are used.
Is the world clock free?
Yes. ClockUnit's world clock is completely free to use with no sign-up required.
Can I use the Meeting Planner for half-hour offsets?
The planner uses 15-minute increments for the local time picker, which covers most scheduling needs. Timezone offsets like UTC+5:30 (India) are handled automatically by the Intl API.