diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/class-wp-locale.php
--- a/wp/wp-includes/class-wp-locale.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/class-wp-locale.php	Fri Sep 05 18:52:52 2025 +0200
@@ -315,10 +315,14 @@
 	 * @since 2.1.0
 	 *
 	 * @param string|int $month_number '01' through '12'.
-	 * @return string Translated full month name.
+	 * @return string Translated full month name. If the month number is not found, an empty string is returned.
 	 */
 	public function get_month( $month_number ) {
-		return $this->month[ zeroise( $month_number, 2 ) ];
+		$month_number = zeroise( $month_number, 2 );
+		if ( ! isset( $this->month[ $month_number ] ) ) {
+			return '';
+		}
+		return $this->month[ $month_number ];
 	}
 
 	/**
@@ -337,6 +341,26 @@
 	}
 
 	/**
+	 * Retrieves translated version of month genitive string.
+	 *
+	 * The $month_number parameter has to be a string
+	 * because it must have the '0' in front of any number
+	 * that is less than 10. Starts from '01' and ends at
+	 * '12'.
+	 *
+	 * You can use an integer instead and it will add the
+	 * '0' before the numbers less than 10 for you.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @param string|int $month_number '01' through '12'.
+	 * @return string Translated genitive month name.
+	 */
+	public function get_month_genitive( $month_number ) {
+		return $this->month_genitive[ zeroise( $month_number, 2 ) ];
+	}
+
+	/**
 	 * Retrieves translated version of meridiem string.
 	 *
 	 * The $meridiem parameter is expected to not be translated.