Find number of missed pay periods for unpaid period

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I don't get the "3's". Why not 4?

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For older versions

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Try this:

=COUNTIFS($B$2:$B$25,">="&G2,$A$2:$A$25,"<="&H2)-1

Another possibility:

Formula:

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This formula returns the same results as the formula of Greg, but sometimes other results as the formulas of JEC.

See attachment with all the 4 formulas and also extra test cases.

EDIT: Also added Phucam's formula with different results
EDIT II: Also added Phucam's edited formula (5:05 UTC; 6:05 MET; 0:05 ET) with different results

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