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### Excel Formula for calculation between two dates

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How do you accurately return years and months (maybe days also) between two dates? Using the function "YEARFRAC" returns years and 10ths of year. Is there another or better function for this?

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## All Answers

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### Excel Formula for calculation of between two dates...

by In reply to Excel Formula for calcula ...

Use the subtraction (-) operator or the NETWORKDAYS function.

If the NETWORKDAYS function is not available, install and load the Analysis ToolPak add-in.

Example

The example may be easier to understand if you copy it to a blank worksheet.

ShowHow to copy an example

1. Create a blank workbook or worksheet.

2. Select the example in the Help topic.

Note Do not select the row or column headers.

Selecting an example from Help
Selecting an example from Help

3. Press CTRL+C.

4. In the worksheet, select cell A1, and press CTRL+V.

5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

A
1. Date
2. 6/8/2007
3. 6/20/2007
Formula Description
=A3-A2 Days between the two dates (12)
=NETWORKDAYS(A2,A3) Weekdays between the two dates (9)

Note To view the dates as numbers, select the cell and click Cells on the Format menu. Click the Number tab, and then click Number in the Category box.

NETWORKDAYS:

Returns the number of whole working days between start_date and end_date. Working days exclude weekends and any dates identified in holidays. Use NETWORKDAYS to calculate employee benefits that accrue based on the number of days worked during a specific term.

If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.

Syntax

NETWORKDAYS(start_date,end_date,holidays)

Important Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

Start_date is a date that represents the start date.

End_date is a date that represents the end date.

Holidays is an optional range of one or more dates to exclude from the working calendar, such as state and federal holidays and floating holidays. The list can be either a range of cells that contains the dates or an array constant (array: Used to build single formulas that produce multiple results or that operate on a group of arguments that are arranged in rows and columns. An array range shares a common formula; an array constant is a group of constants used as an argument.) of the serial numbers that represent the dates.

Remarks

* Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
* If any argument is not a valid date, NETWORKDAYS returns the #VALUE! error value.

Example

The example may be easier to understand if you copy it to a blank worksheet.

ShowHow to copy an example

1. Create a blank workbook or worksheet.

2. Select the example in the Help topic.

Note Do not select the row or column headers.

Selecting an example from Help
Selecting an example from Help

3. Press CTRL+C.

4. In the worksheet, select cell A1, and press CTRL+V.

5. 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.

A B
1. Date Description
2. 10/01/2008 Start date of project
3. 3/01/2009 End date of project
4. 11/26/2008 Holiday
5. 12/4/2008 Holiday
6. 1/21/2009 Holiday
Formula Description (Result)
=NETWORKDAYS(A2,A3) Number of workdays between the start and end date above (10 =NETWORKDAYS(A2,A3,A4) Number of workdays between the start and end date above, excluding the first holiday (107)
=NETWORKDAYS(A2,A3,A4:A6) Number of workdays between the start and end date above, excluding every holiday above (105)

Note To convert the range of cells used for holidays in the last example into an array constant, select reference A4:A6 in the formula and then press F9.

Calculate the number of months between two dates

To do this task, use the MONTH and YEAR functions.
Example

The example may be easier to understand if you copy it to a blank worksheet.

ShowHow to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note Do not select the row or column headers.

Selecting an example from Help
Selecting an example from Help

3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

A
1. Date
2. 6/9/2007
3. 9/2/2007
4. 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 over a year apart (15)

Note To view the dates as numbers, select the cell and click Cells on the Format menu. Click the Number tab, and then click Number in the Category box.

Calculate the number of years between two dates

To do this task, use the YEAR function.
Example

The example may be easier to understand if you copy it to a blank worksheet.

ShowHow to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note Do not select the row or column headers.

Selecting an example from Help
Selecting an example from Help

3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

A
1. Date
2. 6/9/2007
3. 6/4/2010
Formula Description (Result)
=YEAR(A3)-YEAR(A2) Years occurring between two dates (3)

Notes

* To view the dates as numbers, select the cell and click Cells on the Format menu. Click the Number tab, and then click Number in the Category box.
* You cannot subtract a date that is later than another date, or the error #### appears in the cell.

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