
I've created a flow to create a calendar event for certain chains of email. It was working fine until I had a conflict. The data is entered from forms. If the start date is the same as the end date, then it doesn't allow me to create the calendar event as an "All Day Event". I created another compose action to compare the two, return blank if they match, or return the end date if they do not.
I believe what you need to do is to add the below expression to the is all day event, choose enter custom value and add below expression
if(equals(outputs('DateStart') , outputs('DateEnd')), true,false)