if( is_int(substr($end_day,0,4)/4) ) $leap_day=29; //leap year else $leap_day=28;
// //同一年
if(substr($end_day,4,2)==substr($start_day,4,2)) { // the same month $endday_from_startday=$end_day-$start_day+1;
} else { // not same month
switch (substr($end_day,4,2)) { case "01": $endday_from_newyear=substr($end_day,6,2)+1; break; case "02": $endday_from_newyear=substr($end_day,6,2)+31; break; case "03": $endday_from_newyear=substr($end_day,6,2)+$leap_day+31; break; case "04": $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2; break; case "05": $endday_from_newyear=sub