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Excel Formula: Add hours minutes seconds to time

Author: Sun Last Modified: 2020-05-29

doc add subtract days to date 1

Supposing there is a list of time values in Excel, now you want to add 3 hours 45 minutes and 20 seconds to the time values, Excel provides two formulas to help you.

Formula 1

 

Generic formula:

Start_time+hours/24+minutes/1440+seconds/86400

Arguments

Start_time: the time you used to add hours, minutes and seconds.
Hours, minutes, seconds: numbers that indicate the hours, minutes, or seconds you want to add to time. They can be both of whole numbers and decimal numbers.

Return value

Return a value in time format.

How this formula work

Take instance, to add hours, minutes, and seconds list in cell C3:E3 to the time in cell B3, please use below formula:

=B3+C3/24+D3/1440+E3/86400

Press Enter key to get the end time.
doc add hours minutes seconds 2

Explanation

One day contains 24 hours, or 1440 minutes, or 86400 seconds, then one hour is 1/24 a day, one minute is 1/1440 a day, and one second is 1/86400 a day.

Formula 2

 

Generic formula:

Start_time+TIME(hours,minutes,seconds)

Arguments

Start_time: the time you used to add hours, minutes and seconds.
Hours, minutes, seconds: numbers that indicate the hours, minutes or seconds you want to add to time. In this formula, if the numbers which represent the hours, minutes or seconds are decimal numbers, it takes it as whole number when calculation. For example, 10.5 hours will be counted as 10.

Return value

Return a value in time format.

How this formula work

Take instance, to add hours, minutes and seconds list in cell C8:E8 to the time in cell B8, please use below formula:

=B8+TIME(C8,D8,E8)

Press Enter key to get the end time.
doc add hours minutes seconds 3

Explanation

Generally, TIME function is used to convert the decimal numbers to a time in the format hh:mm:ss. Here in this formula, it converts the numbers (10 hours, 12 minutes, and 75 seconds) to a time 10:12:17. Therefore, the whole formula =B8+TIME(C8,D8,E8) will be converted to: 12:56:09+10:12:75.

Remark

1. If you want to subtract the minutes from time, you can combine the MOD function with above formulas:

MOD(Start_time-hours/24-minutes/1440-seconds/86400,1)

Or

MOD(Start_time-TIME(hours,minutes,seconds),1)

In general, it does not allow the negative time in Excel, using the MOD function to flip the negative values to positive will get a correct time.

2. If the result is over 24 hours, just format the result as [h]:mm:ss format in the Custom section under Number tab of the Format Cells dialog.

Sample File

doc sampleClick to download sample file


Relative Formulas

Relative Functions

  • Excel Date Function
    DATE function can help us to combine year, month and day numbers from separate cells to a valid date.
  • Excel WEEKDAY Function
    WEEKDAY function returns an integer number from 1 to 7 to represent the day of the week for a given date in Excel.
  • Excel WORKDAY Function
    The WORKDAY is used to add a specified number of workdays to a started date and returns the future or past date in a serial number format.
  • Excel WORKDAY.INTL Function
    WORKDAY.INTL function adds a specified number of workdays to a start date and returns a workday in the future or past.
  • Excel YEAR Function
    The YEAR function returns the year based on the given date in a 4-digit serial number format.

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