if(preg_match('/^(0?[1-9]|1[0-2])\/(0?[1-9]|[12][0-9]|3[01])\/((19|20)\d{2})$/', $_POST['start_date']) == 0)
echo 'The given date is not in the format(mm/dd/yyyy)

UNIX_TIMESTAMP(STR_TO_DATE( 'mm/dd/yyyy', '%m/%d/%Y' ))

var timeStamp = Date.UTC('year','month','date', 'hour','min','seconds')/1000;
var timeStamp = Date.parse(dateObj/1000);

var datSelected = new Date(this.timeStamp * 1000);

public function generateRandomPwd($num = 7)
{
$char = "023456789abcdefghijkmnopqrstuvwxyz!@#$%^&*";
srand((double)microtime()*1000000);
$i = 0;
$pass = '' ;
while ($i <= $num) {
$num = rand() % 33;
$tmp = substr($char, $num, 1);
$pass = $pass . $tmp;
$i++;
}
return $pass;
}