Date & Time Calculators
Working out dates by hand is error-prone: months have different lengths, leap years add a day, and time zones shift the clock. These calculators do the counting for you, whether you need the number of days until a deadline, the date 90 days from today, or the hours on a weekly timesheet.
Every calculation runs in your browser, so nothing you enter is sent anywhere.
Date & Time tools
Date Calculator
Free date calculator to count the days between two dates, with weekday and weekend totals, or add and subtract days, weeks, months, or years from any date.
Time Calculator
Free time calculator to add or subtract hours, minutes, and seconds from any time, or find the exact difference between a start and end time. Instant.
Hours Calculator
Free hours calculator to total time worked across multiple shifts. Enter start and end times, subtract breaks, and see decimal hours and earnings.
Time Card Calculator
Free time card calculator for a full work week. Enter clock-in and clock-out times with breaks to get regular hours, overtime, and estimated gross pay.
Time Zone Calculator
Convert time between time zones like New York, London, Tokyo, and Sydney, with daylight saving handled automatically and a live world clock. Free.
Time Duration Calculator
Calculate the duration between two times in hours, minutes, and seconds, including overnight shifts that cross midnight. Get decimal hours instantly.
Day Counter
Free day counter to find how many days are between two dates or until today. See totals in weeks, months, weekdays, and weekend days instantly.
Day of the Week Calculator
Find what day of the week any date falls on, past or future. Also shows the week number, day of the year, quarter, and whether it's a leap year.