date handling utility/unit tests

We are building a more flexible date handling utility that allows typing in of not only a date but other stings. The basic signature of the call is DateTime GetDateTime(DateTime? baseDateTime, string enteredValue) the idea is they can enter a parsable date, or a set of strings that represents some concept. Details below. ## Deliverables yesterday tomorrow next week next month now midnight (if date is already there, it computes it, if not, it computes from now) noon (if date is already there, it computes it, if not, it computes from now) military time: 0100, 1256 etc (if date is already there, it computes it, if not, it computes from now) x hours ago x hours from now x days ago x days from now first of next month first of last month last of next month last of last month x day of next month x day of last month x am (if date is already there, it computes it, if not, it computes from now) x pm (if date is already there, it computes it, if not, it computes from now) military time entered (if date is already there, it computes it, if not, it computes from now) yesterday x am yesterday x pm today x am today x pm x am tomorrow x pm yesterday x days ago x pm x days from now x pm x days ago x am x days from now x am sortable not delimited dates: 20120903 sortable delimited dates: 2012-09-03, 2012/09/03 etc dates without slashes (02122014) + x hours (if date is already there, it computes it, if not, it computes from now) - x hours (if date is already there, it computes it, if not, it computes from now) + x days (if date is already there, it computes it, if not, it computes from now) - x days (if date is already there, it computes it, if not, it computes from now) + week (if date is already there, it computes it, if not, it computes from now) - week (if date is already there, it computes it, if not, it computes from now) + month (if date is already there, it computes it, if not, it computes from now) - month (if date is already there, it computes it, if not, it computes from now)