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    mike1724's Avatar
    mike1724 Posts: 3, Reputation: 1
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    #1

    Nov 18, 2009, 12:22 PM
    Formula involving a date, specifically a month
    I'm looking for assistance with what I consider a challenging formula. I want to create a
    SUMIF (if that is the right function) formula that uses a month from a date to keep track of how much time I worked on a specific project. I have a "date" cell formated 1/23/2009 and an "update time" cell that I enter a number representing an amount of time (1.5 for one and a half hours). Then I have a 12 month cells (October Hours, November Hours, etc.. ) that I want to tally the update time entries with the date as the criteria. Is this possible?

    Thanks in advance for any assistance,

    Mike
    JBeaucaire's Avatar
    JBeaucaire Posts: 5,426, Reputation: 997
    Software Expert
    		  
    #2

    Nov 19, 2009, 12:20 AM

    The function you want is probably SUMPRODUCT().

    If you click on GO ADVANCED and use the paperclip icon to upload your workbook (or smaller sample of it), I can help you construct the actual formulas to go in your summary table.
    mike1724's Avatar
    mike1724 Posts: 3, Reputation: 1
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    #3

    Nov 19, 2009, 07:52 AM
    I have posted an example of the spreadsheet.

    Thanks J.B.

    Mike
    Attached Files
  1. File Type: xls date_formula_example.xls (18.5 KB, 111 views)
    2. JBeaucaire's Avatar
    JBeaucaire Posts: 5,426, Reputation: 997
    Software Expert
    		  
    #4

    Nov 19, 2009, 02:25 PM

    In G1 use this:

    =SUMPRODUCT(--(MONTH($D$3:$D$13)=9), $E$3:$E$13)

    Just change the "9" to "10" for October... etc.

    Expand the ranges to match your data, you can allow some expansion room, but don't try to use the entire column and don't go to 50,000 rows needlessly. SUMPRODUCT() is an array formula and shouldn't be applied to unreasonably large ranges if it can be avoided.
    mike1724's Avatar
    mike1724 Posts: 3, Reputation: 1
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    #5

    Nov 20, 2009, 07:50 AM

    Thank you JB, I will give this a try and I bow to your expertise!

    Mike
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