How can I combine fields in a loader script

Hi,

On of my customers delivers data files in the format standing below. As ou can see it is a delimited format. Unfortunately the date and time are in seperate fields. I can combine these fields after loading in a third field, but that takes up a lot of space. How can I combine these fields in a loader script to one datetime field in the database

Thanks,

Frank Heijmans

99842929,20000401,09:32:09,96
99845281,20000401,09:44:01,36
99853628,20000401,10:13:28,218
99856439,20000401,10:24:35,80
99859018,20000401,10:31:10,184
99867987,20000401,11:00:48,116
99868338,20000401,11:03:10,15
99868407,20000401,11:03:21,17
99873418,20000401,11:16:48,108
99884653,20000401,11:49:41,72
99885311,20000401,18:52:24,21