我如何将mktime中的日期插入MySQL？

m-d

$date1=date("m-d",mktime(0,0,0,$month1 ,$day1,1)); 

0000-00-00

$query = "SELECT * FROM table WHERE MONTH(datecol) = {$month1} AND DAYOFMONTH(datecol) = {$day1}"

$date1=date("Y-m-d",mktime(0,0,0,$month1 ,$day1,1));