Calendar & Dates Tools
Make sense of dates, weekdays, ages, and working days. 22 free tools, all running in your browser.
- CalendarA clean monthly and yearly calendar with week numbers and quick navigation.
- Date CalculatorAdd or subtract days, weeks, months, and years from any date to find a new date.
- Days Between DatesCalculate the exact duration between two dates in days, weeks, months, and business days.
- Age CalculatorFind your exact age in years, months, days and hours, plus your life in numbers: heartbeats, full moons and laps around the sun.
- Dog Age CalculatorConvert dog years to human years by size, with a cat age calculator and a full chart.
- Due Date CalculatorEstimate your pregnancy due date, how many weeks along you are, and your trimester dates from your last period.
- Week NumberLook up the ISO week number for today or any date, and see the weeks of the year.
- Leap Year CalculatorCheck if any year is a leap year and see why, plus the next and previous leap years.
- Day of the Week CalculatorFind out what day of the week any date falls on, plus the ISO week number and day of the year.
- Zodiac Sign CalculatorFind your astrological star sign and Chinese zodiac animal from your date of birth.
- Working Days in a YearCount the total working days, weekends, and public holidays in any year for a country.
- Your Age on Other PlanetsSee how old you'd be on Mercury, Mars, Jupiter, and every other planet in the solar system.
- Life in WeeksVisualize your life as a grid of weeks — one dot for every week you've lived and have left — and download it as an A3 poster.
- Doomsday Weekday CalculatorFind the day of the week for any date using the Doomsday algorithm, with the steps shown.
- Hours CalculatorCalculate the hours and minutes between two times, with breaks and overnight shifts.
- Time Card CalculatorTotal a week of clock-in and clock-out times with breaks, overtime, decimal hours and gross pay.
- Time to Decimal CalculatorConvert hours and minutes to decimal hours for payroll, and back, with a minutes chart.
- Overtime CalculatorWork out overtime hours and time-and-a-half or double-time pay from your rate and hours.
- Day of the YearToday's day number, days left and the year as 365 dots, plus a Julian date (YYDDD) converter with a full chart.
- Days From TodayFind the date any number of days, weeks, months or years from today — or how long ago.
- Add or Subtract TimeAdd or subtract days, hours, and minutes from any date and time to find the result.
- Business Days CalculatorCount working days between two dates or add business days to a date, excluding weekends and holidays.