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Excel Formula: Calculate Difference Between Two Dates in Years/Months/Weeks/Days

Author: Sun Last Modified: 2020-08-27

doc calculate difference between time 5

Sometimes, in Excel worksheet, we need to calculate the difference between two dates for getting the durations. Here in this tutorial, it introduces the formulas on calculating difference between two dates in years, months, weeks, and days.

If you want to follow along with this tutorial, please download the example spreadsheet.
doc calculate difference between time 5

Generic formula:

Calculate difference in days


Calculate difference in weeks


Calculate difference in months


Calculate difference in years



Start_datetime: The starting date in the date range. The start date must be smaller than the end date, or the formula will return the error result #NUM!.
End_datetime: The ending date in the date range you want to calculate the date duration. The end date must be greater than the start date, otherwise the formula will return the error value #NUM!.
D: Return difference in days.
D/7:Return difference in weeks. 7 days a week, to return days firstly then divides 7 to get the number of weeks. As the formula returns value in date format, you need to format the result to general or number to get the number of weeks.
M: Return difference in months.
Y: Return difference in years.

How this formula work

Supposing you need to calculate the duration between the dates in cell B4 and B6, please use below formula

Calculate difference in days


Calculate difference in weeks


Calculate difference in months


Calculate difference in years


Press Enter key to get the result.

Tip: the formula to calculate difference in weeks will get the result in date format, just format the result cell as general or number as you need.
doc calculate difference between time 5


DATEDIF function: this function is used to calculate the difference between two dates in days, weeks, month, years, days ignoring years, or month ignoring years.

Relative Formulas

Relative Functions

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