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Excel/using sumif statement

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Question
I would like sum data by hour. Thanks you very much!

2/4/13 13:19   0
2/4/13 13:34   2
2/4/13 13:49   0
2/4/13 14:04   0
2/4/13 14:19   14
2/4/13 14:34   18
2/4/13 14:49   0
2/4/13 15:04   34
2/4/13 15:19   0
2/4/13 15:34   38
2/4/13 15:46   2
2/4/13 15:50   0
2/4/13 16:03   0
2/4/13 16:14   0

Answer should be:
2/4/13 13:00    total
2/4/13 14:00    total
...

Answer
Grace -

Because you are searching for a time range (i.e. 13:00 through 13:59), you will need to use the SUMIFS() function. It allows you to search for multiple criteria.

=SUMIFS(SUM_RANGE,CRITERIA_RANGE1,CRITERIA1,CRITERIA_RANGE2,CRITERIA2...)

SUM_RANGE are the cells that contain the data that should be added, in the case of your sample that would be column C.
CRITERIA_RANGE1 is the cells that contain the hours. In this case, column B.
CRITERIA1 is where we begin the hourly range. Since we're trying to get anything within the 1 o'clock hour, we choose something that means "1:00 or anything after" -- ">=13:00"

If we leave it at this criteria, we'll get everything from 1:00 on. We need to put an end on the range.
CRITERIA_RANGE2 is the same as CRITERIA_RANGE1
CRITERIA2 should be for "anything before 2:00" -- "<=13:59"

The complete function for the 1 o'clock hour is:
=SUMIFS(C1:C10,B1:B10,">=13:00",C1:C10,B1:B10,"<=13:59")

Just change the time in the function to get the other hours totals. Hope this helps - Andrea
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Andrea Lynch

Expertise

I am very familiar with teaching excel concepts, and formulas. I am not as capable with VBA questions.

Experience

I currently tutor in this area. I worked for four years developing curriculum and teaching Microsoft applications to adult audiences. I also previously volunteered for allexperts.com.

Education/Credentials
BA, English, Western Washington University Certificates in C Programming, ASP.NET, VisualBasic.NET, University of Washington Extension

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Rated in the top ten instructors (national), New Horizons Computer Learning Center.

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