Date & Time
Work out ages, date differences, deadlines and durations in seconds. Timezone-free by design: everything runs in your browser.
Age Calculator
Exact age in years, months, days — plus days lived until a date.
Date Difference Calculator
Days, weeks, months and years between any two dates.
Add or Subtract Days
Add or subtract days, weeks, months or years from a date.
Countdown Timer
Count down hours, minutes and seconds with an alarm beep.
Stopwatch
Precise stopwatch with laps and hundredths of a second.
Date to Unix Timestamp Converter
Turn any date and time into Unix seconds and milliseconds.
Timestamp to Date Converter
Decode Unix timestamps into readable local and UTC times.
Business Days Calculator
Count working days between dates, with a custom work week.
Week Number Calculator
ISO week number, week-year and week range for any date.
Time Zone Converter
Convert times between IANA time zones, DST-accurate.