[SOLVED] SAS filter date for the last three months from the start of the third month

SAS filter date for the last three months from the start of the third month

I would like to filter my dataset to the last three months starting from the first of the month in SAS.

I have the following for the yesterday and the last 15 days with macro:

DATA _NULL_;
    yesterday=put(INTNX('day',&today,-1),DATE11.);
    twoweeksago=put(INTNX('day',&today,-15),DATE11.);
    /*threemonths = put(intnx('month', &today, -3, 'same')*/
    call symput('rpt_dt',yesterday);
    call symput('rpt_dt2',twoweeksago);
    /*call symput('rpt_3',threemonths);*/
RUN;

I tried modifying the yesterday and twoweeks ago lines, as you can see from the commented out lines, but this only works three months from today, which means I am filtering all the way to June 23rd and not the June 1st.

For now the work around is to be explicit about how many days since June 1st, but I am thinking there could be a way to code what I am trying to do.

Solution

threemonths = put(intnx('month', &today, -3, 'same')

That's close! Do you happen to know what the 'same' parameter does? It's an alignment specifier. See the intnx documentation for the other options - beginning, middle, end (or their initial letter).

threemonths = put(intnx('month', &today, -3, 'B')

That will start on the 1st of the month 3 months ago.