问题
So I am attempting to simply count the number of months bewtween an earlier date and today, which will be in the B:B column; once the number of months have been counted, the result is then multiplied by 28, then added back to the original date. Note the requirement: Result >= Today, so basically if the result is less than today it needs to add another 28 days. The current formula I made only works if the dates are in the current year (and I am not 100% sure if this formula works, it appears to so far though.)
Here is my defunct formula, but maybe someone can get a general idea from my above comments and the below formula of what I am attempting to achieve here:
=IF(B89="","",IF(I89="X","LEG",IFERROR(IF((MONTH(TODAY()-B89)*28)+B89<TODAY(),(MONTH(TODAY()-B89)*28)+B89+28,(MONTH(TODAY()-B89)*28)+B89),"Future")))
Thank you in advance for your assistance!
Note: I just want to point out that the reference to I89 is insignificant in the above. I just didn't want to remove it in case I deleted the wrong parenthesis or some other typo, so I decided to leave in there. So basically you would not need to necessarily worry about the first two "IF" statements, nor the IFERROR, unless you just wanted to!
2ND EDIT: Okay I decided to strip down formula, original post's formula is above, the stripped version below:
IF((MONTH(TODAY()-B89)*28)+B89<TODAY(),(MONTH(TODAY()-B89)*28)+B89+28,(MONTH(TODAY()-B89)*28)+B89)
回答1:
You should not use MONTH() for this purpose as this will lead to wrong results in some cases, and certainly when the B89 date is in another year.
Instead see how many days you are past the last multiple of 28 days since B89, and go back to that date (by subtracting), and then add another 28 to it:
=TODAY() + 28 - MOD((TODAY()-B89), 28)
The earliest date this can give is the date of tomorrow. If today should be an acceptable outcome of the formula, then replace TODAY() with TODAY()-1, which results in this formula:
=TODAY() + 27 - MOD((TODAY()-1-B89), 28)
回答2:
How about something like this:
=IF(B89="","",IF(I89="X","LEG",IF(IF(B89<=TODAY(),B89+28*IF(AND(B89<TODAY(),TEXT(B89,"mmyy")=TEXT(TODAY(),"mmyy")),"1",(TEXT(TODAY(),"yy")*12+MONTH(TODAY()))-(TEXT(B89,"yy")*12+MONTH(B89))),"Future")<TODAY(),TODAY(),IF(B89<=TODAY(),B89+28*IF(AND(B89<TODAY(),TEXT(B89,"mmyy")=TEXT(TODAY(),"mmyy")),"1",(TEXT(TODAY(),"yy")*12+MONTH(TODAY()))-(TEXT(B89,"yy")*12+MONTH(B89)))))))
Got a little long now, but you have a lot of criteria :)
来源：https://stackoverflow.com/questions/36917334/counting-number-of-months-between-two-dates-in-excel