clear

input str80 string
"06-08-2003"
"30-02-1934"
"19-11-1923"
"12-04-1997"
"29-12-1945"
end

encode string, generate(numeric)

sort numeric
list

   +-------------------------+
   |     string      numeric |
   |-------------------------|
1. | 06-08-2003   06-08-2003 |
2. | 12-04-1997   12-04-1997 |
3. | 19-11-1923   19-11-1923 |
4. | 29-12-1945   29-12-1945 |
5. | 30-02-1934   30-02-1934 |
   +-------------------------+

drop numeric

generate numeric = date(string, "DMY")
format %tddd-NN-YY numeric

list

   +-----------------------+
   |     string    numeric |
   |-----------------------|
1. | 06-08-2003    6-08-03 |
2. | 12-04-1997   12-04-97 |
3. | 19-11-1923   19-11-23 |
4. | 29-12-1945   29-12-45 |
5. | 30-02-1934          . |
   +-----------------------+

sort numeric
list

   +-----------------------+
   |     string    numeric |
   |-----------------------|
1. | 19-11-1923   19-11-23 |
2. | 29-12-1945   29-12-45 |
3. | 12-04-1997   12-04-97 |
4. | 06-08-2003    6-08-03 |
5. | 30-02-1934          . |
   +-----------------------+