how to convert numeric values to numeric dates?

[HitmonTran]

I have a numeric date with time and I need to convert just the datepart into yyyy-mm-dd format.

data (numeric):

RFSTDT
16DEC2020:00:00:00.000

want (numeric):

NEW_RFSTDT
2020-12-16

[SASKiwi]

Use the DATEPART function as documented here: DATEPART 

data _null_;
  RFSTDT = '16DEC2020:00:00:00.000'dt;
  NEW_RFSTDT = datepart(RFSTDT);
  format RFSTDT datetime22.3 NEW_RFSTDT yymmddd10.;
  put _all_;
run;

You also asked the same question here: https://communities.sas.com/t5/SAS-Programming/convert-numeric-date-to-another-format/td-p/707137

and you got the same answer. Why the repeat?

[ChrisNZ · Accepted solution]

As you hinted, you need to use the datepart() function to convert a SAS datetime to a SAS date.

To display that date as you want, use the yymmddd10. format.