Hello AllanBerces 

let
Source = YourPreviousStep,
SortedDates = List.Sort(List.Distinct(Source[Date modified]), Order.Ascending),
LatestDate = List.Last(SortedDates),
PreviousDate = List.LastN(SortedDates, 2){0},
FilteredRows = Table.SelectRows(Source, each [Date modified] = PreviousDate)
in
FilteredRows

Hi AllanBerces 


1.   Sort your date column in Descending order ( To sort right click on column and choose descending option)

2.  Then click on add steps and use thi below M code
      #"Sorted Rows"{1}[Date modified] -------------------------------//#"Sorted Rows" this is the prev steps Name

you get the List 

Now convert the list into table (you can see upper left side there is option to convert the list to table

Here is the result

If this answers your questions, kindly accept it as a solution and give kudos.

Step 1: Sort the date column in descending order

Step 2: Add index column starting from 1

Step 3: Filter on index column for value = 2