Sum of Value overlap dates criteria

Dear Excel Expert,

My problem,
based on long term contract data with start date, end date and monthly revenue (be simplified),
how I summarize with a choice of monthly periods (2, 3, 4, 6 months & yearly)?

Start End Monthly
1/4/16 31/3/20 1.000

Criteria Option
Start : 1/1/16, End : 31/3/16 ( 3months period) or
Start : 1/1/16, End : 30/4/16 ( 4months period), etc..

The following sample data attachment,

I only figure out monthly periods

Formula:

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Thank you very much in advance
qFreud

This solution employs three helper rows, which may be hidden for aesthetic purposes, as well as modifying the formula originally in row 12. The modified formula reads:

Formula:

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The formula for the first helper row, which counts the number of months between rows 8 and 9 is:

Formula:

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The array entered formulas* that helps to find the number of months during that period are actually under contract are:

Formula:

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Formula:

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*Array entered formulas are activated by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer.
Let me know if you have any questions.

JeteMc

Wow
that I was looking for

But seems like the "sum" work only top row "user" criteria,

Well, I need to figure out just one more step

Not sure that I understand what you mean by "Work only for top row 'user' criteria". Does this mean that you want to uses formulas to fill in the table in rows 18:23? I was under the impression that was just a table of expected values for user A2.