Calculate sales value based on specific date

hi Preetsingh86 

You may try this
loss Before= 
Var min_date = calculate(min(table,date),all(table))

Var to_date = max(table,date)
return
calculate(sum(table,loss),all(table),table,date>=min_date&&table,date<=to_date)
Same way you can make the after loss as well.
If this doesnot work, please share sample data.