function date_diff($date1,$date2) {
$tmp_date1 = explode("-",$date1);
$tmp_date2 = explode("-", $date2);
$tmp1 = mktime(0,0,0,$tmp_date1[1], $tmp_date1[2], $tmp_date1[0]);
$tmp2 = mktime(0,0,0,$tmp_date2[1], $tmp_date2[2], $tmp_date2[0]);
$return_date = ($tmp1 - $tmp2) / 86400;
return $return_date;
}
$Today = date('Y-m-d');
$diff_day = date_diff('날짜',$Today);
if($diff_day > 0) {
echo "날짜가 큰 날임.";
} else {
echo "날짜가 작은 날임.";
}