Stopwatch, timer and date calculators online
Six tools for time: measure, count down, add hours, count days between dates and calculate age.
Stopwatch
A precise stopwatch with laps. Start and stop with the space bar, lap with the L key.
Timer
Set minutes and seconds or press a preset button. At the end there is a sound and the tab blinks.
Time calculator
Add or subtract hours, minutes and seconds. Find how much time passes between two moments.
Age calculator
Exact age in years, months and days. Plus the total number of days and the date of the next birthday.
Days between dates
How many days, weeks and months between two dates. Or which date is N days from now.
Working days
Working and calendar days between dates, with your own holidays. Or the date N working days from now.
FAQ
- How accurate is the online stopwatch?
- Time is measured by the browser's system clock to the millisecond, not by counting frames. Even if the tab goes to the background, the stopwatch shows the correct time when you return.
- Will the alarm sound if the tab is minimized?
- Yes, the sound plays even when the tab is in the background and the tab title starts blinking. The first start must be a click: browsers only allow sound after a user action.
- How do I add time in the calculator?
- Enter two durations, for example 1:45:30 and 2:20:15, and choose plus. The result is shown as hours : minutes : seconds and separately in minutes and seconds.
- How is age in months and days calculated?
- Full years first, then full months, then the remaining days. Leap years and different month lengths are taken into account.
- How do I count the days since a date?
- Enter the date in the first field and leave today in the second. The calculator shows how many days, weeks and months have passed.
- Which holidays are excluded?
- By default only Saturdays and Sundays. Add your public holidays in the Holidays field, one date per line, and they are excluded too.