Merge two columns of dates in the same data set

I would like to concatenate two columns of the same dataset:

    ID      Date1       Date2         
    001     1-1999            
    002                 2-2021
    003                 3-2021     
    004     03-2019                  
   ....     .......     ......

I tried:

data out1
  set out   
  Test = coalesce(Date1 Date2);
run;

but without success.

Any suggestion?
Thank you in advance

>Solution :

My 2 suggestions:

1. Make sure that you use the correct function. Coalesce for numeric values, coalesceC for character
2. You are missing a comma between Date1 and Date2.

Do this

data have;
input ID $ (Date1 Date2)($);
infile datalines dlm = '|' missover;
datalines;  
001|1-1999 |       
002|       |2-2021 
003|       |3-2021 
004|03-2019|       
;

data want;
   set have;
   test = coalescec(Date1, Date2);
run;