Free world clock, time zone converter, stopwatch and timer tools
GlobalWorldClock is a free collection of browser-based time tools. Track the current time in major cities around the world, convert between time zones for meeting planning, measure elapsed time with a precision stopwatch, count down with custom or preset timers, and set reminders with an online alarm clock. Nothing needs to be installed, no account is required, and all preferences are stored on your own device.
World clock — live time in cities worldwide
The world clock shows the current local time in 30 major cities across every continent. You can search by city name, save favourite locations, toggle between 12 and 24-hour formats, and see a day/night indicator at a glance. Times update every second and automatically account for daylight saving time. Remote workers, travellers, support teams and anyone with international contacts use it to avoid calling at the wrong hour.
Time zone converter — convert any date and time between cities
The time zone converter answers "if it is 15:30 in Chicago, what does the clock say in Frankfurt?" Enter a date and time in one city, choose the destination, and the converted local time appears instantly alongside the UTC equivalent. Daylight saving transitions are handled automatically for the specific date you enter, so conversions are correct even during the weeks when different regions change their clocks on different days.
Online stopwatch — accurate to a hundredth of a second
The online stopwatch measures elapsed time with millisecond precision. Use the Lap button to record split and total times without stopping the clock, and export the full lap list to a text file or CSV spreadsheet. Fullscreen mode makes the display readable across a gym or classroom. The stopwatch is useful for interval training, timed reading, debate rounds, cooking tasks that need an exact duration, and any process you want to measure without a phone in hand.
Countdown timers — custom and preset durations
The countdown timer accepts any combination of hours, minutes and seconds, and plays an audio alert when the count reaches zero. A progress bar shows how much of the interval has passed. Quick-access preset pages cover the most common durations: a 5 minute timer for Pomodoro breaks, a 10 minute timer for short activities, a 15 minute timer for classroom rotations, a 30 minute timer for study blocks, and a 1 hour timer for deep work or cooking.
Online alarm clock — ring at a chosen time of day
The online alarm clock rings at a specific wall-clock moment rather than after a set duration. Add a label to remind yourself what the alarm is for, pick from several alert tones, and keep the tab open while you work. The alarm uses your device's local time, shown in large digits on the page. This makes it a convenient desk companion for meeting reminders, end-of-lunch prompts and shift handovers.
Time zones explained — UTC, GMT, offsets and daylight saving
The time zones guide explains how the world's 24 standard zones work, why some countries sit on half-hour or quarter-hour offsets (India at UTC+05:30, Nepal at UTC+05:45), how daylight saving reshuffles the map twice a year in different hemispheres, and how to read a UTC offset table. Practical scheduling tips help distributed teams avoid the most common mistakes.
Frequently asked questions
Are all the tools really free?
Yes. Every tool on GlobalWorldClock is free, with no account, no trial period and no premium tier.
Do I need to sign up?
No. Open any tool and start using it immediately. Favourite cities and timer settings are stored in your browser's local storage only.
Does the world clock handle daylight saving time automatically?
Yes. Local times are formatted using the IANA time zone database, which is built into modern browsers and includes current daylight saving rules.
Will the timers keep running if I switch to another tab?
The elapsed time stays accurate because it is calculated from the system clock, but browsers may throttle the display update rate in background tabs. Keep the tab visible when the exact moment matters.
Is my data stored on a server?
No. All preferences, favourite cities and timer settings live in your browser's local storage. Nothing is sent to any server.
Can I use the tools on my phone?
Yes. All tools are fully responsive and work on phones, tablets and desktop computers.
What is the difference between UTC and GMT?
UTC is an atomic time standard that never shifts for summer time. GMT is a time zone that equals UTC in winter but the United Kingdom moves to British Summer Time (UTC+01:00) in summer.