each month no of days

[Anandkvn]

data noofdays;
do i=1 to 12;
st='01jan2010'd ;
ed='01dec2010'd;
eom=intnx('month',st,ed,'e');
numdays=day(eom);
output;
end;
format st ed eom:date9.;
run;

count each month number of days in do loop

[PaigeMiller]

What is your question?

[Kurt_Bremser]

You repeat the identical calculation 12 times. You may want to use i somewhere in that calculation 😉

[maguiremq]

As mentioned in the previous posts, if you're using a loop, you need to include that in your INTNX() call.

Since iteration value is represented by `i`, you need to include that in the third argument.

data noofdays;
do i=1 to 12;
st='01jan2010'd ;
ed='01dec2010'd;
/* Putting the `i` in the third argument */
eom=intnx('month',st,i,'e');
numdays=day(eom);
output;
end;
format st ed eom:date9.;
run;

This will increment the loop each time by the iteration value specified for a specified interval. 

Looking at your original output, you will see that you get dates that are far away in the future. This is because your third argument is a SAS date which is internally represented as a number.

[Anandkvn]

Hi Mag

Thank you very much for solution

[PGStats]

MDY : create a SAS date from year, month and day; INTNX : count the number of date intervals between SAS dates; INTNX : find a SAS date a given number of intervals from a given date. Combine those to your purpose :

data nbOfDays;
year = 2010;
do month = 1 to 12;
    numdays = 1 + intck("DAY", mdy(month, 1, year), intnx("MONTH", mdy(month, 1, year), 0, "END"));
    output;
    end;
run;

proc print data=nbOfDays; run;

[Anandkvn]

Hi PGstats,

Thank you very much for solution

[Tom · Accepted solution]

Just use the DAY() function to find the day of month of the last day of the month.

data noofdays;
  do year=2010 to 2010;
    do month=1 to 12 ;
      eom=intnx('month',mdy(month,1,year),0,'end');
      numdays=day(eom);
      output;
    end;
  end;
  format eom date9.;
run;

Obs    year    month          eom    numdays

  1    2010       1     31JAN2010       31
  2    2010       2     28FEB2010       28
  3    2010       3     31MAR2010       31
  4    2010       4     30APR2010       30
  5    2010       5     31MAY2010       31
  6    2010       6     30JUN2010       30
  7    2010       7     31JUL2010       31
  8    2010       8     31AUG2010       31
  9    2010       9     30SEP2010       30
 10    2010      10     31OCT2010       31
 11    2010      11     30NOV2010       30
 12    2010      12     31DEC2010       31