📅 Free Online DateTime Tools
Free online date & time tools — stopwatch, Pomodoro timer, date difference, week number, timezone converter, world clock, age in days, and more. Instant, no signup.
9 tools available · 100% free · No signup required
Stopwatch
Free online stopwatch with lap times and 10ms precision. Start, stop, lap, and reset instantly in your browser — no download or signup needed.
Pomodoro Timer
Free online Pomodoro timer with a 25-minute focus and 5-minute break cycle. Boost productivity with customizable work and break intervals — runs in your browser.
Week Number Calculator
Find the ISO 8601 week number for any date online for free. See the week number, weekday, and day of year instantly — accurate for week 1 to 53.
Date to Day Converter
Find out what day of the week any date falls on. Enter a past or future date to instantly see the weekday, full date, and whether it is a weekend — free online.
Hours Calculator
Calculate hours and minutes between a start and end time online for free. Deduct breaks, handle overnight shifts, and get decimal hours for timesheets and payroll.
Add or Subtract Days
Add or subtract days, weeks, months, or years from any date online for free. Find a future or past date instantly for deadlines, due dates, and planning.
Age in Days Calculator
Calculate exactly how many days old you are from your date of birth online for free. See your age in total days, weeks, months, and hours instantly.
Timezone Converter
Convert a time between world time zones online for free. Choose from 40+ major cities with automatic daylight saving handling — perfect for meetings and travel.
World Clock
Free online world clock showing live times in cities across the globe. Add and remove clocks from 40+ time zones with automatic daylight saving — updates every second.
Time is easy to lose track of and surprisingly fiddly to calculate. These date and time tools handle the jobs that trip people up: measuring elapsed time with a stopwatch, working focused sessions with a Pomodoro timer, counting the days between two dates, finding the ISO week number, adding or subtracting days from a date, and converting a moment between time zones or watching several cities at once on a world clock. They run entirely in your browser, so they stay quick and work without an account.
Coordinate across days and time zones
Scheduling a call with someone overseas? The timezone converter and world clock show the same instant in each location, including daylight-saving shifts, so nobody joins an hour early. Planning a project or a countdown? The date-difference and add-or-subtract-days tools tell you exactly how many days sit between two dates or what date falls a set number of days out. For quick reference, you can find any date's weekday or its week number in seconds.
Timers that behave correctly
The stopwatch and Pomodoro timer are built to keep accurate time and to clean up properly when you leave the page, so they will not drift or leave stray timers running in the background. Timezone features read from the browser's built-in internationalisation data, which keeps daylight-saving rules current without any manual updates. Whether you are studying with focused intervals, timing a workout, or lining up a meeting across continents, these tools give you a reliable read on the clock.