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

This worked for me

=CEILING(((MOD(D16-C16;1))*24);0,25)

It calculates the time difference of two different times C16 and D16 in hours first. Then rounds up.