Return date when stock turns negative

[stylemonk]

Hi

I am trying to create simple Index / Match formula to find out at which point (date) stock turns negative, but I can't figure out how to insert running total inside of MATCH function.


Formula which I am using - =INDEX(D3:G3,MATCH(TRUE,SUM(B4-(D4:G4))<0,0))

D3:G3 - Range with dates
B4 - Current stock
D4:G4 - Demand

Anyway please see attached.

THanks

[Glenn Kennedy]

One way, using an array formula:

=IF(SUM(D4:G4)<B4,"",INDEX(D$3:G$3,MIN(IF(SUBTOTAL(9,OFFSET(D4,0,0,1,COLUMN(D4:G4)-COLUMN(D4)+1))>=B4,COLUMN(D4:G4)-COLUMN(D4)+1))))

Array Formulae are a little different from ordinary formulae in that they MUST be confirmed in the FIRST CELL ONLY by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. After that, the array can be dragged down as normal, to cover the desired range.

You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

Don't type the curly brackets yourself - it won't work...

[stylemonk]

Awesome! Exactly what I am after.

Thanks

[Glenn Kennedy]

You're welcome.

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