Converting date/time to date and then comparing

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I have a customer who's SLA is in days, not minutes. If the due date is 10/27 @ 11:00, it doesn't matter if we complete at 11:00 or later in the day. Essentially, they don't care about the time, just the day. I'm trying to write a report that uses the due date (or a custom date because for larger requests, we negotiate a custom due date) and compares it to the date closed to determine if we completed it on the due date. I'm converting both date/time fields to MM DD YYYY and then trying to do a compare.