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Time Calculator

Calculate time differences, add or subtract time, and convert between time units.

Time Between Two Times

Add or Subtract: hours, minutes, seconds

Add or Subtract: years, months, weeks, and days

Time Unit Calculator

Time Calculator

The online Time Calculator provides several tools for working with times, durations, dates, and time units. You can calculate the time between two times, add or subtract hours, minutes, and seconds, perform date calculations, and convert between time units.

Use the calculator for schedules, elapsed time, appointments, work periods, travel, deadlines, and everyday time calculations. The available 12-hour and 24-hour formats make it easier to enter times using the format you prefer.

Ways to Use the Time Calculator

Calculate time between two times

Enter a start time and an end time to calculate the elapsed time between them in hours, minutes, and seconds.

Add time to a starting time

Add hours, minutes, and seconds to a base time to determine a later time.

Subtract time from a starting time

Subtract a duration from a base time to find an earlier time.

Add time to a date

Add years, months, weeks, and days to a selected date for planning future dates and deadlines.

Subtract time from a date

Subtract calendar units from a selected date to calculate an earlier date.

Convert time units

Convert time values between supported units for quick calculations involving hours, minutes, seconds, and other time measurements.

Time Calculator Features

  • Calculate time between two times
  • Hours, minutes, and seconds
  • 12-hour time format
  • 24-hour time format
  • Optional end-second inclusion
  • Add hours to a time
  • Add minutes to a time
  • Add seconds to a time
  • Subtract hours from a time
  • Subtract minutes from a time
  • Subtract seconds from a time
  • Use the current time
  • Add years to a date
  • Add months to a date
  • Add weeks to a date
  • Add days to a date
  • Subtract years, months, weeks, and days
  • Time unit conversions
  • Responsive calculator interface
  • Light and dark themes

How to Use the Time Calculator

  1. 1

    Choose the calculator

    Select the section that matches your calculation, such as finding the difference between two times, adding or subtracting time, working with a date, or converting time units.

  2. 2

    Enter your starting value

    Enter the start time, base time, start date, or time value required by the selected calculator.

  3. 3

    Enter the second time or duration

    For a time difference, enter the end time. For addition or subtraction, enter the duration or calendar units you want to apply.

  4. 4

    Choose add or subtract

    When using one of the addition and subtraction calculators, select the operation you want to perform.

  5. 5

    Calculate the result

    Select Calculate to process the values and display the resulting time, duration, or date.

  6. 6

    Adjust the values when needed

    Change the entered values, time format, operation, or units to perform another calculation.

Time Between Two Times Calculator

Enter a start time and an end time to calculate the elapsed time between them. Hours, minutes, and seconds can be used for more precise time difference calculations.

Hours and Minutes Calculator

Calculate with hours and minutes when you need to find a time difference or adjust a starting time by a specific duration. Seconds can also be included when greater precision is needed.

Add Time Calculator

Enter a base time and add hours, minutes, or seconds to determine the resulting time. This can be useful for appointments, schedules, travel times, events, and other time-based planning.

Subtract Time Calculator

Subtract hours, minutes, and seconds from a base time to calculate an earlier time. Use this when working backward from a deadline, appointment, departure, or scheduled event.

Time Duration Calculator

Find the duration between a starting time and an ending time without manually converting hours, minutes, and seconds.

12 Hour and 24 Hour Time Calculator

Switch between 12-hour and 24-hour time formats when entering times. This makes the calculator useful with both AM and PM style times and 24-hour clock notation.

Add or Subtract Days From a Date

Start with a calendar date and add or subtract years, months, weeks, and days to determine a new date. Multiple calendar units can be used in the same calculation.

Time Unit Calculator

Convert a time value between supported units. Use the converter for calculations involving hours, minutes, seconds, and other available time measurements.