Formatting a Macro Variable storing a date

[SasStatistics]

I am creating a macro variable of the form: 

Data _NULL_;
 ThisDate=Date();
 call symput("FirstDayTwoMonthBack",(IntNX("Month", ThisDate, -2, 'beginning')));
Run;

Then when you display the value of this macro variable it is just a "number", i would like to store it as a date format of the type: "2021-11-29" which means year 2021, month = 1, and day = 29. 

Any advice on how to do this? 

[PaigeMiller]

usually, it is unnecessary to format a macro variable. the un-formatted macro variable works fine in all logical and arithmetical situations.

The only time you need to format a macro variable is when you are going to use it in a title, label or file name.

[maguiremq]

Data _NULL_;
 ThisDate=Date();
 call symput("FirstDayTwoMonthBack", put(IntNX("Month", ThisDate, -2, 'beginning'), yymmdd10.));
Run;

%put &FirstDayTwoMonthBack;
2021-09-01

I agree with @PaigeMiller that this isn't totally necessary, but that gives you what you want I think.

[PaigeMiller]

Please remember, @SasStatistics , that if you format the macro variable value, and you want to use it for arithmetic or logical purposes, then you will have to un-format it. That's two operations (formatting followed by un-formatting, and don't forget to do both, and don't get one of the operations wrong) instead of zero operations. Either will work if done properly, it's your choice.

[BrunoMueller · Accepted solution]

As others already mentioned I would keep it as a number. I would also use CALL SYMPUTX to avoid notes about type conversion.

The functions of the DATA Step can also be used in the SAS macro language using %SYSFUNC. Have a look at the below code sample.

data _null_;
 ThisDate=Date();
 call symputx("FirstDayTwoMonthBack", IntNX("Month", ThisDate, -2, 'beginning'));

run;
%put NOTE: &FirstDayTwoMonthBack;
%put NOTE: %sysfunc(putn(&FirstDayTwoMonthBack, yymmddd10.));

%let newDate = %sysfunc(intnx(month, %sysfunc(today()), -2, b));
%put NOTE: &=newDate;