How to get Number of days between 2 dates when specific condition is met?-CodePudding

I want to get the number of days between two dates based on specific condition, here is the image illustration of what I am talking about:

I need to devise a formula to calculate number of days from dates (column C) it takes ID = 1 to reach from L1 to L2 , so ideally the output for ID = 1 should be:

L1 : 0

L2 : 2022-07-14 - 2022-07-06 = 8

Same for other ids (2,3). I am just a beginner trying to learn, so I apologize for my ordinary question. Thank you

CodePudding user response：

DAYS will give you the day count between dates. try:

=DAYS(SINGLE(FILTER(C:C; B:B="L2"; A:A=1)); 
      SINGLE(FILTER(C:C; B:B="L1"; A:A=1)))

=DAYS(SINGLE(FILTER(C:C; B:B="L2"; A:A=2)); 
      SINGLE(FILTER(C:C; B:B="L1"; A:A=2)))

=DAYS(SINGLE(FILTER(C:C; B:B="L2"; A:A=3)); 
      SINGLE(FILTER(C:C; B:B="L1"; A:A=3)))