Time Duration Calculator

Use the calculator below to find the hours, minutes, and seconds between two times.

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Hour
Minute
Second
Start Time
End Time
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Time Between Two Dates

Use this time and date duration calculator to find out the number of days, hours, minutes, and seconds between the times on two different dates. To add or subtract time from a date, use the Time Calculator.

Start Time:
End Time:

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Calculate the duration between two times

Calculating the duration between two times can be a little tricky depending on the numbers of minutes and seconds in the two times being compared. As an example, the following are the steps to determine the number of hours and minutes between two chosen times within the same day:

  1. First, identify the starting and an ending time. The goal is to subtract the starting time from the ending time under the correct conditions.
  2. If the times are not already in 24-hour time, convert them to 24-hour time. AM hours are the same in both 12-hour and 24-hour time. For PM hours, add 12 to the number to convert it to 24-hour time. For example, 1:00 PM would be 13:00 in 24-hour time.
  3. Determine whether the number of minutes is larger in the starting time or the ending time.
    • If the ending time has a larger number of minutes: Subtract the starting time from the ending time as you would subtract normally, keeping the hours and minutes on the appropriate side of the ":", where hours are on the left, and minutes are on the right. For example, 13:57 − 9:22 = 4:35.
    • If the starting time has a larger number of minutes: Treat the hour and minute portion separately. Add 60 to the number of minutes in the ending time, and subtract 1 hour from the hour portion of the ending time. Then, subtract the minutes and the hours, keeping the result on the appropriate side of the ":" where hours are on the left, and minutes are on the right. For example, 13:57 − 9:58 becomes 12:117 − 9:58 = 3:59.

Frequently Asked Questions

What happens when the end time is earlier than the start time?
In the first calculator, the end time is treated as falling on the next day, so 10:00 PM to 6:00 AM gives 8 hours; the result notes that the start time is assumed to be on the previous day. In the two-dates calculator, the start must simply be earlier than the end.

Can I enter partial hours or minutes?
Yes. The hour, minute, and second fields accept decimal values, such as 8.5 hours or 30.5 minutes, and blank fields count as zero — as long as the combined time stays within a single day (under 24:00:00).

How is the duration shown?
The result gives the duration as days, hours, minutes, and seconds, and also as a total in each unit — for example, 1 day 9 hours is also shown as 1.375 days, 33 hours, 1,980 minutes, and 118,800 seconds.