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World Clock — Track the Current Time in Every City
A world clock is an essential tool for anyone living, working, or communicating across international time zones. TimezoneBudy's free world clock displays the current local time for 130+ cities and countries simultaneously, updating every second so you always have accurate, live information at a glance.
Whether you're a remote worker coordinating a team spread across New York, London, and Singapore, a traveller planning an international itinerary, or a business scheduling a call with partners in Tokyo and Dubai, knowing the current time by city is critical. Getting it wrong can mean missed meetings, delayed decisions, and unnecessary confusion.
How Does a World Clock Work?
Every location on Earth is assigned a time zone — an offset measured in hours (and sometimes half-hours) from Coordinated Universal Time (UTC), the world's universal time standard. TimezoneBudy calculates each city's local time by applying its UTC offset to your device's real-time clock. Times automatically adjust for Daylight Saving Time (DST) wherever it applies, so you never have to manually account for seasonal clock changes.
The global time zone system divides the Earth into 24 primary zones, each roughly 15 degrees of longitude wide. In practice, political and geographic decisions mean real boundaries are far more varied — some countries like India (UTC+5:30) and Nepal (UTC+5:45) use non-standard half-hour offsets, while China spans five geographic time zones but uses a single national time.
UTC vs GMT — What's the Difference?
GMT (Greenwich Mean Time) is the mean solar time at the Royal Observatory in Greenwich, England. UTC replaced it in 1972 as the world's primary time reference, using precise atomic clocks instead of astronomical observation. The two are numerically equivalent for everyday use — both sit at UTC/GMT+0 — but UTC is the modern scientific standard that your phone, computer, and every server on the internet synchronise to.
Why TimezoneBudy?
Unlike basic world clock apps, TimezoneBudy combines a live world clock with a full suite of international time tools in one place. Pin your most-used cities for instant comparison, switch between Table and Compact views to match your workflow, and jump seamlessly to the Time Zone Converter to schedule meetings, the Time Difference Calculator to find the gap between any two cities, Sun & Moon times for your location, or the World Time Map to visualise day and night across the globe in real time. All tools are free, require no sign-up, and work on any device.
Time Zone Converter
Convert time between any two cities, plan international meetings, and find the best overlap window for distributed teams.
World Time Map
See the live day/night boundary across the globe and click any city for its current local time and UTC offset.
Frequently Asked Questions
What is a World Clock?
A world clock is a tool that displays the current local time for multiple cities or countries simultaneously. Rather than converting manually, a world clock does the calculation automatically, accounting for each location's UTC offset and any active Daylight Saving Time adjustment. TimezoneBudy's world clock shows live times for 130+ cities updated every second.
How does a World Clock work?
A world clock works by taking a single reference time — Coordinated Universal Time (UTC) — and adding or subtracting each city's fixed UTC offset to calculate its local time. For example, London in winter is UTC+0, New York is UTC−5, and Mumbai is UTC+5:30. The clock updates in real time using your device's system clock, which is itself synchronised to global UTC servers. Daylight Saving Time adjustments are applied automatically based on each timezone's rules.
What is the difference between UTC and GMT?
GMT (Greenwich Mean Time) is a time zone based on the solar time at the Prime Meridian in Greenwich, England. UTC (Coordinated Universal Time) is a modern atomic-clock-based time standard that replaced GMT in 1972 as the world's official reference point. For practical everyday purposes the two are the same — both are at offset zero — but UTC is the precise scientific standard used by computers, servers, and international systems worldwide. TimezoneBudy uses UTC as its underlying reference for all time calculations.
Why do different countries have different time zones?
Time zones exist because the Earth rotates 360 degrees every 24 hours, meaning the Sun's position — and therefore local noon — differs by roughly one hour for every 15 degrees of longitude. Without time zones, clocks in cities east and west of each other would show wildly different times for midday. The system of 24 primary time zones, each one hour apart, was standardised in the late 19th century to enable coordinated railway schedules, global communication, and international trade. Today, the exact boundaries are set by governments and often reflect political borders rather than strict geography.
How can I compare the time between two cities?
The easiest way is to use TimezoneBudy's Time Difference Calculator, which shows the exact number of hours between any two cities and highlights the business-hours overlap. You can also use the Time Zone Converter to pick a specific time in one city and instantly see what it translates to in another — useful for scheduling international meetings or calls.
How accurate is the TimezoneBudy World Clock?
TimezoneBudy's world clock is as accurate as your device's system clock, which modern operating systems keep synchronised to within milliseconds of UTC via NTP (Network Time Protocol) servers. Time zone and Daylight Saving Time rules are maintained using the IANA Time Zone Database — the same authoritative source used by Google, Apple, and every major operating system — ensuring DST transitions are applied correctly for every country.