Dates and Between statement - sas

Question

I am using SAS E.G. 7.1
I have the following code:
data time_dim_monthly;
do i = 0 to 200;
index_no = i;
year_date = year(intnx('month','01JAN2008'd,i));
month_date = month(intnx('month','01JAN2008'd,i));
SOM = put(intnx('month', '01JAN2008'd, i, 'b'),date11.) ;
EOM = put(intnx('month', '01JAN2008'd, i, 'e'),date11.) ;
days_in_month = INTCK('day',intnx('month', '01JAN2008'd, i, 'b'),
intnx('month', '01JAN2008'd, i, 'e'));
output;
end;
run;
followed by
proc sql;
create table calendar as
select year_date, month_date, index_no, put(today(),date11.) as todays_dt, som, eom
from time_dim_monthly
where put(today(),date11.) between som and eom
/*or datepart((INTNX('month',today(),-1)) between som and eom)*/
order by index_no
;
quit;
The output looks like this:
year_date month_date index_no todays_dt SOM EOM
2008 10 9 31-MAY-2017 01-OCT-2008 31-OCT-2008
2009 10 21 31-MAY-2017 01-OCT-2009 31-OCT-2009
2010 10 33 31-MAY-2017 01-OCT-2010 31-OCT-2010
2011 10 45 31-MAY-2017 01-OCT-2011 31-OCT-2011
2012 10 57 31-MAY-2017 01-OCT-2012 31-OCT-2012
2013 10 69 31-MAY-2017 01-OCT-2013 31-OCT-2013
2014 10 81 31-MAY-2017 01-OCT-2014 31-OCT-2014
2015 10 93 31-MAY-2017 01-OCT-2015 31-OCT-2015
2016 10 105 31-MAY-2017 01-OCT-2016 31-OCT-2016
2017 5 112 31-MAY-2017 01-MAY-2017 31-MAY-2017
2017 10 117 31-MAY-2017 01-OCT-2017 31-OCT-2017
2018 5 124 31-MAY-2017 01-MAY-2018 31-MAY-2018
2018 10 129 31-MAY-2017 01-OCT-2018 31-OCT-2018
2019 5 136 31-MAY-2017 01-MAY-2019 31-MAY-2019
2019 10 141 31-MAY-2017 01-OCT-2019 31-OCT-2019
2020 5 148 31-MAY-2017 01-MAY-2020 31-MAY-2020
2020 10 153 31-MAY-2017 01-OCT-2020 31-OCT-2020
2021 5 160 31-MAY-2017 01-MAY-2021 31-MAY-2021
2021 10 165 31-MAY-2017 01-OCT-2021 31-OCT-2021
2022 5 172 31-MAY-2017 01-MAY-2022 31-MAY-2022
2022 10 177 31-MAY-2017 01-OCT-2022 31-OCT-2022
2023 5 184 31-MAY-2017 01-MAY-2023 31-MAY-2023
2023 10 189 31-MAY-2017 01-OCT-2023 31-OCT-2023
2024 5 196 31-MAY-2017 01-MAY-2024 31-MAY-2024
While I'd expected that it would only give me one line:
2017 5 112 31-MAY-2017 01-MAY-2017 31-MAY-2017
Would appreciate help in understanding why this is happening.
Thank you

Answer 1

This is your mistake:
SOM = put(intnx('month', '01JAN2008'd, i, 'b'),date11.) ;
EOM = put(intnx('month', '01JAN2008'd, i, 'e'),date11.) ;
where put(today(),date11.) between som and eom
put creates a character variable. You shouldn't really use between with character variables unless you really know what you're doing (it will compare in alphabetical order).
Use numeric variables. Get rid of the put. Instead use a format statement to make the variables look nice, but still be numeric.
SOM = intnx('month', '01JAN2008'd, i, 'b') ;
EOM = intnx('month', '01JAN2008'd, i, 'e') ;
format som eom date11.;
later
where today() between som and eom