Date is not selecting from Calendar From Module-18 Part-4

Hi

01. My code is not selecting the date when we click from calendar icon, could you please correct me...code is attached

02. I'm not clear below from your recording

         A.  wd.findElement(By.xpath("td[text()='"+day+"']")).click();

         B.   what is the meaning if >0 ? given in code

                if(selected.compareTo(current) > 0)

         C. is below selected xpath is meaningful, means won't it change in future

              wd.findElement(By.xpath("//*[@id='datepicker']/table/tbody/tr[6]/td[6]/div")).click();

Thanks & Regards,