Ticket #50624: 50624.patch

src/wp-includes/script-loader.php

@@ -322 +322 @@
                 )
         );
 
+        // Calculate the timezone abbr (EDT, PST) if possible.
+        $timezone_string = get_option( 'timezone_string', 'UTC' );
+        $timezone_abbr   = '';
+
+        if ( ! empty( $timezone_string ) ) {
+                $timezone_date = new DateTime( null, new DateTimeZone( $timezone_string ) );
+                $timezone_abbr = $timezone_date->format( 'T' );
+        }
+
         $scripts->add_inline_script(
                 'wp-date',
                 sprintf(
@@ -354 +363 @@
                                         ),
                                         'timezone' => array(
                                                 'offset' => get_option( 'gmt_offset', 0 ),
-                                                'string' => get_option( 'timezone_string', 'UTC' ),
+                                                'string' => $timezone_string,
+                                                'abbr'   => $timezone_abbr,
                                         ),
                                 )
                         )