sql - Setting date end parameter to 12 months ago -

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i have pull comparative data , want set reoport run automatically.

to first date range use parameters 

=dateadd("m", -3, dateserial(year(now()), month(now()), 1))

this start date 3 months ago i.e. 1 jan 2013.

=dateadd("d", -1, dateserial(year(now()), month(now()), 1))

this end date, last day of last month 31 mar 2013.

i need same dates last year using 

=dateadd("m", -15, dateserial(year(now()), month(now()), 1))

this start date 15 months ago ie. 1 jan 2012

what use find last day of month 13 months ago, i.e. 31 mar 2012?

since you've worked out 31-mar-2013, subtract year using nested dateadd functions:

=dateadd("yyyy"     , -1     , dateadd("d", -1, dateserial(year(now()), month(now()), 1)))

this returns 31-mar-2012.


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