Calculate number of months between 2 dates

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john liem - 31 May 2005 18:10 GMT

I have a Start Date and an End Date, need to calculate the number of
months in between. Conditions: Start date <=15th includes the month,
End date >= 15th includes the month.
Examples: between 14-04-05 and 15-06-05: 3 months, between 16-04-05 and
13-06-05: 1 month, between 16-02-04 and 03-05-05: 14 months. Thank you.
John

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john liem

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JE McGimpsey - 31 May 2005 23:30 GMT

One way:

=12*(YEAR(B1)-YEAR(A1))+MONTH(B1)-MONTH(A1)+1-(DAY(A1)>15)-(DAY(B1)<15)

> I have a Start Date and an End Date, need to calculate the number of
> months in between. Conditions: Start date <=15th includes the month,
> End date >= 15th includes the month.
> Examples: between 14-04-05 and 15-06-05: 3 months, between 16-04-05 and
> 13-06-05: 1 month, between 16-02-04 and 03-05-05: 14 months. Thank you.
> John

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Daniel CHEN - 31 May 2005 23:35 GMT

Use the following formula:

=(YEAR(A2)-YEAR(A1))*12+MONTH(A2)-MONTH(A1)-1+IF(DAY(A1)<=15,1,0)+IF(DAY(A2)>=15,1,0)

assume A1 is starting date and A2 is ending date.

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Daniel CHEN

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Simon Cleal - 01 Jun 2005 13:02 GMT

Alternativly use the DATEDIF function

=DATEDIF(A1,A2,"M")

The "M" indicates that you want the answer in Months...see Help for more info

Simon Cleal
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JE McGimpsey - 01 Jun 2005 14:08 GMT

You probably should have tested this - DATEDIF() doesn't meet the
criteria in the problem statement.

For instance, in the example the OP gave:

A1: 14 Apr 2005
A2: 15 Jun 2005

DATEDIF returns 2, while by the OP's rules, the result should be 3.

> Alternativly use the DATEDIF function
>
> =DATEDIF(A1,A2,"M")
>
> The "M" indicates that you want the answer in Months...see Help for more info

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