Formula Correction (concerning dates in excel)

Please see the attached file containing a formula I need help with.

The formula I need to have corrected concerns dates that are typed into excel and then calculates how many months there are during a particular calendar year given the dates that have been typed in.

All instructions are listed in the attached sheet. This is a pretty difficult task so if you can figure it out, all the better to you!

Thanks for any help!

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Two things:

When using LEFT,RIGHT,MID functions to extract numbers, usually you want to coerce the results (which are text strings) to numbers... so, one way is to add +0 after the function.... then you will be comparing apples to apples.

Another thing is that Excel has several functions to assist in breaking up dates to the year, month or day components, so better to use them if you can...

so use,


=IF(YEAR($G$12)>RIGHT(E28,4)+0,12-G27,MONTH($G$12)-1+$H$2/SUMIF($N$32:$N$45,MONTH($G$12),$O$32:$O$45))

or, you don't really need the table of months and days/month, you can use instead.

=IF(YEAR($G$12)>RIGHT(E28,4)+0,12-G27,MONTH($G$12)-1+$H$2/DAY(DATE(YEAR($G$12),MONTH($G$12)+1,0)))