Excel 2007 Calc Nbr of Mths between dates

[KrazyKasper]

I need to calculate the number of months between two dates, but if the earlier date is not the first of the month then use the first of the next month as the earlier date.

I tried modifying the formula:
=(YEAR(LDate)-YEAR(EDate))*12+MONTH(LDate)-MONTH(EDate)

but have not had any success.

Using the following dates as an example:
EDate 11/4/06
LDate 5/31/11
The result should be: 54

Using the following dates:
EDate 11/1/06
LDate 5/31/11
The result should be: 55

Any help is appreciated.

 

[jfish1288]

There probably is a easier way, built in function or something, but this worked for me.

=(YEAR(Ldate)-IF(AND(MONTH(Edate)=12,DAY(Edate)<>1),YEAR(Edate)+1,YEAR(Edate))-1)*12+(13-IF(DAY(Edate)=1,MONTH(Edate),MONTH(EDATE(Edate,1))))+MONTH(Ldate)

Note that the capitalized EDATE is not your early date, it is a built in function do not change that. This formula follows the logic of if it is not the first of the month go to next month for Edate but not Ldate.

 

[KrazyKasper]

Substituting the cell numbers (e.g., A1 and A2) in place of LDate and EDate gives me -1 when formatted as "General" and ##### when formatted as a date (short or long).

Am I missing something?

 

[MikeWx]

To obtain the results in your examples, add the portion in red to your original equation.

=(YEAR(LDATE)-YEAR(EDATE))*12+MONTH(LDATE)-MONTH(EDATE)[COLOR=red]+IF(DAY(EDATE)=1,1,0)[/COLOR]

 

[KrazyKasper]

Thanks. That did it.
Appreciate all the help.

Thread can now be closed.

 

[MikeWx]

Thanks for your feedback.

Mike

 

[barry houdini]

You could also get the same results using DATEDIF function like this

=DATEDIF(Edate-DAY(Edate-1),Ldate,"m")

 

[KrazyKasper]

Thanks!
I'll give it a try too.
Please close thread.