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Let's say that you want find out how many days a customer takes to pay a bill or how long it takes to ship a product upon receipt of an approved order. There are several ways to calculate the difference between two dates.
What do you want to do?
Calculate the number of days between two dates
To do this task, use the subtraction () operator or the NETWORKDAYS function as shown in the following example.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Web App, copy and paste one cell at a time.Important Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Web App, repeat copying and pasting for each cell in the example.
Important For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
Date 

6/8/2007 

6/20/2007 

Formula 
Description (Result) 
=A3A2 
Days between the two dates (12) 
=NETWORKDAYS(A2,A3) 
Weekdays between the two dates (9) 

Note You can format the dates as numbers. Select the cell and, on the Home tab, in the Number group, click the arrow, and then click Number.
For more information about how to use this function, see NETWORKDAYS function.
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Calculate the number of months between two dates
To do this task, use the MONTH and YEAR functions as shown in the following example.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Web App, copy and paste one cell at a time.Important Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Web App, repeat copying and pasting for each cell in the example.
Important For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
Date 

6/9/2007 

9/2/2007 

12/10/2008 

Formula 
Description (Result) 
=MONTH(A3)MONTH(A2) 
Months occurring between two dates in the same year (3) 
=(YEAR(A4)YEAR(A3))*12+MONTH(A4)MONTH(A3) 
Months occurring between two dates more than a year apart (15) 

Note You can format the dates as numbers. Select the cell, and on the Home tab, in the Number group, click the arrow, and then click Number.
For more information about how to use these functions, see MONTH function and YEAR function.
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Calculate the number of years between two dates
To do this task, use the YEAR function as shown in the following example.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Web App, copy and paste one cell at a time.Important Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Web App, repeat copying and pasting for each cell in the example.
Important For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
Date 

6/9/2007 

6/4/2010 

Formula 
Description (Result) 
=YEAR(A3)YEAR(A2) 
Years occurring between two dates (3) 

Notes
 You can format the dates as numbers. Select the cell and, on the Home tab, in the Number group, click the arrow, and then click Number.
 If you subtract a later date from an earlier date, the error #### appears in the cell.
For more information about how to use this function, see YEAR function.
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