#!/nairvigv/bin/bash
echo "ENTER FIRST DATE IN YYYYMMDD format"
read startdate



startyear=${startdate:0:4}
startmonth=${startdate:4:2}
startday=${startdate:6:2}




echo The date you Entered is $startyear"-"$startmonth"-"$startday


echo "ENTER SECOND DATE IN YYYYMMDD format"
read enddate
endyear=${enddate:0:4}
endmonth=${enddate:4:2}
endday=${enddate:6:2}



echo The date you Entered is $endyear"-"$endmonth"-"$endday



days_months=(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

echo ${days_months[*]}
##################### YEARS######################################################
if [ $startyear -eq $endyear ]

then
        yeardifference=0;
        echo $yeardifference

 else
        if [ $startyear % 4 == 0 && $startyear % 100 != 0 || $startyear % 400 == 0 ] then
                if[ $endyear % 4 == 0 && $endyear % 100 != 0 || $endyear % 400 == 0 ] then
                        if[ $startyear -gt $endyear ] then
                        yeardifference=`expr $startyear - $endyear * 365 + 2`
                        else
                        yeardifference=`expr $endyear - $startyear * 365 + 2`

                        fi
                        if[ $endmonth -gt $startmonth ]then
                                if( "${days_months[$startmonth - 1]}" -gt  "${days_months[1]}" )then
                                        yeardifference=yeardifference-1;
                                fi
                        fi
                fi
 else
                   if[ $startyear -gt $endyear ] then
                        yeardifference=`expr $startyear - $endyear * 365 + 1`
                        else
                        yeardifference=`expr $endyear - $startyear * 365 + 1`
                        
                        fi
                        if[ $startmonth -gt $endmonth ]then
                                if( "${days_months[$endmonth - 1]}" -gt  "${days_months[1]}" )then
                                        yeardifference=yeardifference-1;
                                fi
                        fi
                fi


else

                if[ $startyear -gt $endyear ]then
                         yeardifference=`expr $startyear - $endyear * 365`

                        else
                         yeardifference=`expr $endyear - $start * 365`
                fi



fi