Round time to nearest 15min interval in Excel

Question

I\'ve an excel spreadsheet with a column which has the date and time of a particular event. I would like to round this to the nearest 15 minute interval so that I can count

Answer 1

simple:

• if rounded up =CEILING(A1,"00:15")
• if rounded down =FLOOR(A1, "00:15")

Where A1 is the difference between the two time. It can be a reference or calculations: =CEILING(C2-B2,"00:15"), where C2 is the end time and B2 is the start time.