Convert two integers into timestamp

How do I convert two integers, one for date and one for time, into a timestamp? - Given 20200304 and 1046, return a timestamp for April 3, 2020, 10:46 AM. - Given 20200304 and 946, return a timestamp for April 3, 2020, 9:46 AM. - Given 20200304 and 2359, return a timestamp for April 3, 2020, 11:59 PM. - Given 20200304 and 0, return a timestamp for April 3, 2020, 0:00 AM. I'm running Version 7, Revision 1.