You need a timestamp field. Such a field will combine date and time in a single field and then you can use a range or inequality in your search criteria to pull up a found set of the needed records for your report. ( a relationship to do the same is also possible.)
If you only have separate date and time fields, you can add a calculation field to your table that combines them into a timestamp using this expression:
TimeStamp ( YourDatefield ; YourTimeField )
Be sure to select "TimeStamp" as the calculation field's result type.
Then you can specify such date and time criteria in this field to produce the needed found set of records.