PHPRunner manual
Check if start date is earlier than end date

On the Edit page verify that the start date is earlier than the end date. function BeforeEdit($values, $where) {   //split into an array (year,month,day,hour,minute,second)    $arr = db2time($values["start_date"]);   //convert to datetime    $start = mktime($arr[3],$arr[4],$arr[5],$arr[1],$arr[2],$arr[0]);   //split into an array (year,month,day,hour,minute,second)    $arr = db2time($values["end_date"]);   $end = mktime($arr[3],$arr[4],$arr[5],$arr[1],$arr[2],$arr[0]);    if ($end<$start)    {   echo "Error";     return false;    }   else {     return true;   } }