statement to extract data based on date

[asmith601]

Hi guys. I am a teacher working on a spreadsheet that requires the extraction of data separately for fall & spring semester. My dates are done in columns so that each row is a student. Please see me cheesy example below:

8/17/2017 12/19/2017 1/3/2018 5/24/2018

Student1 X 0 0 X
Student2 X X X X

Here is my statement:

=IF(AND(TODAY()>='Days Off'!D3,TODAY()<='Days Off'!D4),COUNTIF('Roster Engagement'!D18:CJ18,"X")+D17,IF(TODAY()>='Days Off'!D6,COUNTIF('Roster Engagement'!CK18:II18,"X")+D17))

I need to sum up the absences for each semester i.e., student1 has 1 for each. and student2 has 2 for each.

The "Days Off" worksheet is where i store holidays, state & end dates; the "Roster Engagement" is where I store the daily info above; ignore the D17. This statement appears to return the info needed, but I think it might be a sloppy way of doing it. Are there any ideas on a more robust statement?

Thanks in advance!

 

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[TD="align: right"]04/12/2017[/TD]
[TD="align: right"]05/12/2017[/TD]
[TD="align: right"]06/12/2017[/TD]
[TD="align: right"]07/12/2017[/TD]
[TD="align: right"]08/12/2017[/TD]
[TD="align: right"]07/01/2018[/TD]
[TD="align: right"]08/01/2018[/TD]
[TD="align: right"]09/01/2018[/TD]
[TD="align: right"]10/01/2018[/TD]
[TD="align: right"]11/01/2018[/TD]
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[TD]fred[/TD]
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[TD="align: right"]0[/TD]
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[TD="align: right"]0[/TD]
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[TD]bill[/TD]
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[TD="align: right"]0[/TD]
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[TD="colspan: 6"]my more cheesier example has semesters lasting only 5 days[/TD]
[TD="colspan: 4"]4th to 8th december and 7th to 11th january[/TD]
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[TD]clearly[/TD]
[TD="colspan: 5"]fred was absent twice in the first and 3 times in the second[/TD]
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[TD="colspan: 4"]bill was absent only one day in the first semestre[/TD]
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[TD] [/TD]
[TD]04/12/2017[/TD]
[TD]07/01/2018[/TD]
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[TD]08/12/2017[/TD]
[TD]11/01/2018[/TD]
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[TD]fred[/TD]
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[TD="colspan: 2"]formula returning 2[/TD]
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[TD="colspan: 7"]=SUMPRODUCT(($B$2:$K$2>=D$15)*($B$2:$K$2<=D$16)*($B3:$K3<>""))[/TD]
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[TD="colspan: 3"]dragged across and down[/TD]
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[TD="colspan: 6"]note we count all cells that are not blank within the date constraints[/TD]
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