Help! Date Difference Mulitple entries in rows

[big40ish]

Hi

First time so please go gentle....

What i need to accomplish is work out the differnce between two date in a table, which keeps getting updated with new data against the same Asset Number.

As you can see we have multiple rows with the same Asset SN as we are taking measurements everymonth... some are misssing so I need to calculate the difference between the two dates to work how long the dates havent been updated

Column E =IF(C2=MAX(IF(A2=$A$2:$A$4859,$C$2:$C$4859,"")),"Latest","old data")
Column F =IF(MAX(INDEX((A2=$A$2:$A$10000)*$C$2:$C$10000,))=C2,"Newest Data","Old Data")
Column H =IF(F15="Newest Data",90-(TODAY()-C15),"")

I hope you can help!!

 

[earthworm]

As per my knowledge you can achieve this through below concept . Try

Book1
	A	B	C	D	E
1				Helper Column 1	Helper Column 2
2				23-Jun-21
3	23-Jun-21			9-Sep-21	78
4				5-Aug-20
5				1-Sep-20	27
6
7	9-Sep-21	78
8
9
10
11
12
13	5-Aug-20
14	1-Sep-20	27
15
16
17
Sheet1

Cell Formulas
Range	Formula
D2:D17	D2	=IFERROR(INDEX($A$1:$A$17,AGGREGATE(15,6,ROW($A$1:$A$17)-ROW($A$1)+1/($A$1:$A$17<>""),ROWS(D$2:D2))),"")
E2	E2	=""
E3:E17	E3	=IFERROR(IF(D3>D2,D3-D2,""),"")
B1:B17	B1	=IFERROR(IF(OR(ISERROR(VLOOKUP(A1,$D$2:$E$17,2,0)),VLOOKUP(A1,$D$2:$E$17,2,0)=0),"",VLOOKUP(A1,$D$2:$E$17,2,0)),"")

 

[Fluff]

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