How to generate explode the datediff between 2 dates to multiple rows

Thank much AlexisOlson ,

1) regarding the Dax approach,  I have the "DayssinceStartDate" as part of the dataset and Dax is not recognizing this field, in the,  GENERATESERIES ( 1, [DaysSinceStartDate] ) ) ? unless its part of aggregate function

2) regarding the approach1 (custom), is this going to be  new dataset and how to refer to the source dataset assuming its 'table1' and has the fields, startdate,enddate and dayssinceStartDate ? 

3)Assumimg I am going with the dax way, need to have the startDate columm from table1 along with DaysSinceStartdate to be able to define relationship to other table which has just the startDate (single  value)  

End goal is I need to able to plot the DaysSinceStartDate on the x-axis of chart with the counts from the table1 which has the startdate and enddate fields