Fetch the Previous row Date to the current row as a new column using DAX

[likhithar]

Hello All,

 I have Sales against Contract Number with Date1.
I need to Derive Date2 Field from Date1, I need fetch Previous Row of Date1 as current row for Date2.

I'm attaching the snap for reference.Help me out on this.

TIA

[Samthomas03]

I think this might be helpful. 

note: added an index column in power query editor.