Custom column based on 2 different columns

anandmitta , Create a new column like

New column =

var _diff = datediff([created_date], today(), day)+1

return

Switch(true() ,

_diff <7, 0 ,

_diff <= 12 && isblank([Book No]) && isblank([Cont No])   , 0,

_diff <= 12   , 1,

_diff > 12 && isblank([Book No]) && isblank([Cont No])   , 0,

_diff <= 12   , 2,

0)

Thank you so much amitchandak. It worked 

There was just 1 small correction to the above query. The value should be 1 or 2 if it falls in the specific date range and book no and cont no are empty. where as the above query makes it 0. Below is the corrected query.