If that is a varchar type, it is still valid provided that it follows this kind of format : YYYYMMDDHHmmSS where Y is year, M is month, D is day, H for hour, m for minute and S for second. For more info check
here
With that format you have, I suggest that you use substring function to get the info, or split that and give them an equivalent valid numeric date say March => 03 and PM.. to a valid 24 hour format.
HTH