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

Assuming you have 2 date-times and you want to find the total and round up to the nearest 15 minutes:

A1 = 7/10/2014 16:10    
A2 = 7/10/2014 17:49

First get the total in decimal hours:

A3:   =(A2-A1)*24

Then you can round up to the nearest quarter hour:

A4:  =Ceiling(A3, .25)

Or do it all on one cell:

A3:  =Ceiling((A2-A1)*24, .25)