计算特定日期起12个月前的日期

Question

I'm trying to calculate a date 12 months ago from specific input date.

Example:

In the Cell A5 the user input a date (dd/mm/yyyy) , and in the Cell A7 i have the following formula:

=MONTH(A5)-12

But this formula doesn't work, and i don´t know how to get the date 12 months ago. Any question post on comments.

Answer 1

You can do this:

=DATE(YEAR(A5),MONTH(A5)-12,DAY(A5))

Or since 12 months is one year:

=DATE(YEAR(A5)-1,MONTH(A5),DAY(A5))

Answer 2

Per this Microsoft documentation , the best way to do this is with the EDATE function .

=EDATE(A5, -12)

(Then format the cell as a Date)

Note that there are some differences between this approach and the one Scott recommended . In particular, consider that if your original value is a leap day (February 29th), then subtracting 12 months will fall into a year where there is no leap day. Scott's approach will return March 1st, where the EDATE function will land on February 28th.

The same thing can be seen when adding/subtracting any arbitrary number of months near the end of a long month. For example, adding one month to March 31st should give April 30th with the EDATE approach, but will give May 1st when adding values to date parts.