raj0390, It would help if you list the DB2 and version (along with operating system) so the appropriate answer can be supplied (i.e. some functions are in DB2 z/OS but not LUW).
However, I don't believe any DB2 has a function to convert that string into a Timestamp. At least not directly.
If you format is identical in all cases, you can try to parse out the information and build a timestamp string. For example
SUBSTR('TS-STRING',21,4) || '-' || CASE SUBSTR('TS-STRING',1,3) WHEN 'Jan' THEN '01'
WHEN 'Feb' THEN 02
etc.
end
|| '-' || SUBSR(you get the idea I hope).
PS TS-STRING is the character timestamp string you have in your post. I didn't want to type all that in the example.