Setting date end parameter to 12 months ago

Question

I have to pull some comparative data and want to set the reoport to run automatically.

To get the first date range I use parameters

=DateAdd("m", -3, DateSerial(Year(Now()), Month(Now()), 1))

This is the start date 3 months ago i.e. 1 Jan 2013.

=DateAdd("d", -1, DateSerial(Year(Now()), Month(Now()), 1))

This is the end date, last day of last month is 31 Mar 2013.

I need to get the same dates for last year so I am using

=DateAdd("m", -15, DateSerial(Year(Now()), Month(Now()), 1))    

This is the start date 15 months ago ie. 1 Jan 2012

What would I use to find the last day of the month 13 months ago, i.e. 31 Mar 2012?

Answer 1

Since you've already worked out 31-Mar-2013, just subtract a year from that using nested DateAdd functions:

=DateAdd("yyyy"
    , -1
    , DateAdd("d", -1, DateSerial(Year(Now()), Month(Now()), 1)))

This returns 31-Mar-2012.