Call to undefined function: date_default_timezone_set()

[dvdalt]

Fatal error: Call to undefined function: date_default_timezone_set() in /home/content/p/e/n/html/app/views/users/register.ctp on line 89

please i need help on resove this error this is the code section THANK YOU ALL

if (strlen($errormessage)<1) {
$username = $POST['username'];
$password = $POST['pw'];
$fname = $POST['fname'];
$lname = $POST['lname'];
$dob = $POST['dob'];
$gender = 1;
$email = $POST['email'];
$active = 0;
$kkey = md5(rand(0,10000)) ;
$newsletter = 1;
$admin = 0;
date_default_timezone_set('UTC');
$created = date("Y-m-d G:i:s");

[coldwerturkey]

PHP 5 >= 5.1.0

from php manual

[NogDog]

What version of PHP are you using? Presumably, it's older than PHP 5.1.0, which is when that function was introduced? If so, it's well past time to get up to date (I think 5.2.9 is the latest stable release). If you can't, then you can try setting it with [man]putenv/man:

if(function_exists('date_default_timezone_set')
{
   date_default_timezone_set('UTC');
}
else
{
   putenv("TZ=UTC");
}