Look up in the docs for the CTOT command (character to Time). You'll have to convert your date to char and concatenate with your character field.
PF
>I want to convert a date and character field into a datetime field. In the table I currently have the date in a date field and the time in a character field. I want both to be in the datetime field. How do I convert it?
>
>TIA
(On an infant's shirt): Already smarter than Bush