Index: src/wp-admin/includes/class-wp-ms-sites-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-ms-sites-list-table.php	(revision 47611)
+++ src/wp-admin/includes/class-wp-ms-sites-list-table.php	(working copy)
@@ -476,7 +476,11 @@
 			$date = __( 'Y/m/d g:i:s a' );
 		}
 
-		echo ( '0000-00-00 00:00:00' === $blog['last_updated'] ) ? __( 'Never' ) : mysql2date( $date, $blog['last_updated'] );
+		if ( '0000-00-00 00:00:00' === $blog['last_updated'] ) {
+			_e( 'Never' );
+		} else {
+			echo wp_date( $date, mysql2date( 'U', $blog['last_updated'] ) );
+		}
 	}
 
 	/**
@@ -500,7 +504,7 @@
 		if ( '0000-00-00 00:00:00' === $blog['registered'] ) {
 			echo '—';
 		} else {
-			echo mysql2date( $date, $blog['registered'] );
+			echo wp_date( $date, mysql2date( 'U', $blog['registered'] ) );
 		}
 	}
 
Index: src/wp-admin/includes/class-wp-ms-users-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-ms-users-list-table.php	(revision 47611)
+++ src/wp-admin/includes/class-wp-ms-users-list-table.php	(working copy)
@@ -335,7 +335,7 @@
 		} else {
 			$date = __( 'Y/m/d g:i:s a' );
 		}
-		echo mysql2date( $date, $user->user_registered );
+		echo wp_date( $date, mysql2date( 'U', $user->user_registered ) );
 	}
 
 	/**