Problem:
Listed in column A are dates when an employee was absent.
Column B contains a letter, indicating the type of each absence (V for vacation, S for sick).
We want to count the number of vacation days that occurred during the last 90 days.
Solution:
Use the SUM and TODAY functions in the Array formula:
{=SUM(((TODAY()-A2:A8)<=90)*(B2:B8=C2))}
To apply Array formula:
Select the cell, press and simultaneously press .
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