Can any one explain how can we get last date of each month for several years without using intnx function.
because intnx was introduced in 9.2 and above.
i want to know how previous coders code in this particular situation.
Soemthing like
select (month);
when (1,3,5,7,8,10,12) day = 31;
when(4,6,9,11) day = 30;
when (2) do;
if mod(year,4) ne 0 and (mod(year,400) = 0 or mod(year,100) ne 0)
then day = 29;
else day = 28;
end;
end;
Untested, posted from my tablet.
@rogeralfa111 wrote:
Can any one explain how can we get last date of each month for several years without using intnx function.
because intnx was introduced in 9.2 and above.
I assume this is an academic question.
The intnx() function existed with certainty already in versions prior to 9.2. No more sure if it was already V6 but certainly since V8.<n>
Here a link to V9.1.3 docu that includes intnx(): SAS 9.1.3 Language Reference: Dictionary, Fifth Edition
...or here a link to SAS V8 docu I found: https://www.sfu.ca/sasdoc/sashtml/lgref/z0212700.htm
Below a lazy approach that doesn't need separate logic for the different number of days per month or for dealing with leap years.
data work.last_day_of_month;
format date date9.;
do date='01jan1900'd to today();
if day(date+1)=1 then
do;
output;
date+27;
end;
end;
run;
...and of course with a given date you can just use the following test: day(date+1)=1
There are a number of books on common numeric calculations and dates is one of them.
However be a bit careful with FEBRUARY and years as some references didn't consider the year 2000, which was an exception to the common 100/400 year determination of Leap Years (hence a problem called Y2K). Be very careful of any code relying on 2-digit years because that is a symptom of problems to come.
Historically, I've also created a date dimension and queried the table.
https://gist.github.com/statgeek/9606118
EDIT: the holiday portion would need to be updated (clearly very old code)
data have;
do year=2020 to 2023;
do month=1 to 12;
date=mdy(month,1,year);
last_day=mdy(ifn(month=12,1,month+1),1,ifn(month=12,year+1,year))-date;
last_date=mdy(month,last_day,year);
output;
end;
end;
format last_date date yymmdd10.;
run;
For each year/month, get the date value for the first day of next month. Then subtract 1:
data have;
do year=2020 to 2023;
do month=1 to 12;
nxt_date1=mdy(mod(month,12)+1,1,year+(month=12)); *Next month first date *;
last_date=nxt_date1-1;
last_day=day(last_date);
output;
end;
end;
format nxt_date1 date9. last_date date9.;
run;
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