Free Date & Time Tools
Work out ages, count the days between dates, add or subtract time, convert time zones, find week numbers and run countdown, stopwatch and Pomodoro timers.
8 date & time tools
Age
Age Calculator
Calculate exact age in years, months and days from a date of birth.
ΔdDate Difference Calculator
Count the days, weeks and months between two dates.
+dAdd or Subtract Days from a Date
Find the date that is a number of days, weeks or months away.
TZTime Zone Converter
Convert a time between London, New York, Sydney and other cities.
WkWeek Number Calculator
Find the ISO week number and day of the year for any date.
⏱Online Countdown Timer
Set a countdown timer with an alarm sound.
00:Online Stopwatch
A precise stopwatch with lap times.
25Pomodoro Timer
Focus in 25-minute sprints with timed breaks.
Frequently asked questions
Do date tools account for leap years?
Yes. They use the browser date engine, which handles leap years and daylight saving.
Do timers keep running in the background?
Keep the tab open. Browsers may slow timers in tabs that are hidden for a long time.