*日期處理,加指定的天數或指定的分
*@param day_delta 日偏移量,正負都可以
*@param minute_delta 分偏移量,正負都可以
*/function date_sort($date,$day_delta=0,$minute_delta=0){
$parts = explode(' ', $date);
$date = $parts[0];
$time = $parts[1];
$ymd = explode('-', $date);
$hms = explode(':', $time);
$year = $ymd[0];
$month = $ymd[1];
$day = $ymd[2];
$hour = $hms[0];
$minute = $hms[1];
$second = $hms[2];
$ptime=mktime($hour,$minute,$second,$month,$day,$year);
$ntime=$ptime+3600*24*$day_delta+60*$minute_delta;
$ndate=date('Y-m-d H:i:s',$ntime);
return $ndate;
}