Issue with class date in edit command

[ryanlml]

edit 1 dt/2022-10-28 1600-0000 does not give any error, which is fine, I assume that this means the class date starts at 4pm on 28th Oct and ends at 12am 29th Oct.

However, edit 1 dt/2022-10-27 1600-0000 changes the class date that starts at 4pm on 27th Oct and ends at 12am 28th Oct. Since the time "spills over" to the 28th of Oct, I expected that the person shows up in the schedule list for 28 Oct, but it is not there.

As a solution perhaps don't allow class dates to end at 0000. If that is input by the user I suggest parsing 0000 as 2359. In this case 1600-2359 is unambiguous.