[6.0] Remove obsolete code (joomla#43959)

* Remove obsolete code

* Remove properties

---------

Co-authored-by: Quy <[email protected]>
Co-authored-by: Harald Leithner <[email protected]>

Author: 3 people

libraries/src/Date/Date.php

@@ -56,29 +56,6 @@ class Date extends \DateTime
      */
     public static $format = 'Y-m-d H:i:s';
 
-    /**
-     * Placeholder for a \DateTimeZone object with GMT as the time zone.
-     *
-     * @var    object
-     * @since  1.7.0
-     *
-     * @deprecated  4.0 will be removed in 6.0
-     *              Will be removed without replacement
-     */
-    protected static $gmt;
-
-    /**
-     * Placeholder for a \DateTimeZone object with the default server
-     * time zone as the time zone.
-     *
-     * @var    object
-     * @since  1.7.0
-     *
-     * @deprecated  4.0 will be removed in 6.0
-     *              Will be removed without replacement
-     */
-    protected static $stz;
-
     /**
      * The \DateTimeZone object for usage in rending dates as strings.
      *
@@ -97,13 +74,6 @@ class Date extends \DateTime
      */
     public function __construct($date = 'now', $tz = null)
     {
-        // Create the base GMT and server time zone objects.
-        if (empty(self::$gmt) || empty(self::$stz)) {
-            // @TODO: This code block stays here only for B/C, can be removed in 5.0
-            self::$gmt = new \DateTimeZone('UTC');
-            self::$stz = new \DateTimeZone(@date_default_timezone_get());
-        }
-
         // If the time zone object is not set, attempt to build it.
         if (!($tz instanceof \DateTimeZone)) {
             if (\is_string($tz)) {