[php][timezone] откуда php берёт timezone?

~# cat test.php 
<?php

  echo "date - ".date("H:i");
  echo "\n";
  echo "UTC date - ".gmdate("H:i");
  echo "\n";
  $a = localtime();
  echo "localtime - ".$a[2].":".$a[1];
  echo "\n";

  echo "Set timezone to Europe/Moscow\n";
  date_default_timezone_set("Europe/Moscow");

  echo "date - ".date("H:i");
  echo "\n";
  echo "UTC date - ".gmdate("H:i");
  echo "\n";
  $a = localtime();
  echo "localtime - ".$a[2].":".$a[1];
  echo "\n";

  echo date_default_timezone_get();


?>
~# php -f test.php 
date - 11:03
UTC date - 08:03
localtime - 11:3
Set timezone to Europe/Moscow
date - 11:03
UTC date - 08:03
localtime - 11:3
~# cat t.c
#include <stdio.h>
#include <time.h>


struct tm *t;
time_t tt;

int main(void)
{

  tt = time(NULL);
  t = localtime(&tt);
  printf("%d:%d\n", t->tm_hour, t->tm_min);

  return 0;
}
~# ./a.out 
12:3
~# date -R
Fri, 18 Nov 2011 12:03:41 +0400
~# grep timezone /etc/php.ini
; Defines the default timezone used by the date functions
date.timezone = "Europe/Moscow"