LOOKUPVALUE if date difference is smaller than two years

Hi , babajat 

According to your description, you want to create two calculated columns from your logic. Right?

Here are the steps you can refer to :
(1)This is my test data:

(2)We can click "New Column" and enter this:

Q1 = var _cur_ID = [ID] 
var _cur_DATE_A = [DATE A] 
var _cur_DATE_D = [DATE D] 
var _pre_dateA  =MAXX( FILTER( 'Table' , 'Table'[ID] =_cur_ID && 'Table'[DATE A] < _cur_DATE_A) , [DATE A])
var _days = IF(_pre_dateA <> BLANK() , INT(_cur_DATE_D-_pre_dateA))
return
IF(_days <= 730 && _days<> BLANK(), 1, 0)

Q1 = var _cur_ID = [ID] 
var _cur_DATE_A = [DATE A] 
var _cur_DATE_D = [DATE D] 
var _pre_dateA  =MAXX( FILTER( 'Table' , 'Table'[ID] =_cur_ID && 'Table'[DATE A] < _cur_DATE_A) , [DATE A])
var _days = IF(_pre_dateA <> BLANK() , INT(_cur_DATE_D-_pre_dateA))
return
IF(_days <= 730 && _days<> BLANK(), 1, 0)

(3)Then we can meet your need , the result is as follows:

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

Best Regards,

Aniya Zhang

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