CSV files are just text files. So there is no need to "import" them.  Just write a data step to READ the file instead. Then you have complete control over how each variable is defined.
data want;
  infile cards dsd ;
  input dt :anydtdtm. ;
  format dt datetime19.;
cards;
2020/09/11 02:14:27
2020/09/11 02:15:37
2020/09/11 02:16:08
;
Obs                     dt
 1      11SEP2020:02:14:27
 2      11SEP2020:02:15:37
 3      11SEP2020:02:16:08