Dates & Time Calculators

Free date and time calculators: count the days between two dates, calculate an exact age, and add up the hours you work.

11 calculators

• Age Calculator

  Find your exact age in years, months, and days, plus your next birthday.

• Days Between Dates Calculator

  Count the days, weekdays, and weeks between two dates.

• Hours Worked Calculator (Time Card)

  A free time card: add up your weekly hours from start and end times, with breaks and pay.

• Time Calculator

  Add and subtract hours and minutes, and see the total in decimal hours.

• Sleep Calculator

  Find the best time to go to bed or wake up, based on 90-minute sleep cycles.

• Military Time Converter

  Convert military and 24-hour time to 12-hour AM/PM time and back.

• Time Zone Converter

  Convert a time between time zones and cities, with daylight saving time handled.

• Countdown Calculator

  See the days, hours, minutes, and seconds left until any date, live.

• Business Days Calculator

  Add or subtract working days from a date, skipping weekends (holidays not removed).

• Birthday Calculator

  Days until your next birthday, the weekday you were born, and life milestones.

• Julian Date Calculator

  Convert a date to its Julian day of the year and to the astronomical Julian Date (JD).