To be honest I’m not entirely clear what you are after here:
If this is a single day event, only display the start date.
else if this is a multi day event display start and end date.
That’s what the above template code does – if an event takes place and ends on the same day it shows only the start date. If an event takes place and ends two days later it shows the start and the end date.
I want to show the start and end date if it is a multiple day event. If it is a single day event, I want to show both.
So this is confusing me – do you actually mean you want to show both the start and end dates for single events?