Date/Time: Handle a missing post weekday in the_weekday() and the_weekday_date().

`get_post_time()` returns false when the post date cannot be parsed. Both
functions passed that straight to `WP_Locale::get_weekday()`, where it was
coerced to the array key 0, so the post was silently labeled Sunday. Now
nothing is output in that case, and the filterable string result is cast and
clamped to 0-6 to match the `int<0, 6>` type of `WP_Locale::get_weekday()`.

This removes the corresponding entry from the `argument.type` PHPStan baseline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: westonruter

src/wp-includes/general-template.php

@@ -3436,7 +3436,13 @@ function the_weekday() {
 		return;
 	}
 
-	$the_weekday = $wp_locale->get_weekday( get_post_time( 'w', false, $post ) );
+	$weekday_number = get_post_time( 'w', false, $post );
+
+	if ( false === $weekday_number ) {
+		return;
+	}
+
+	$the_weekday = $wp_locale->get_weekday( clamp( (int) $weekday_number, 0, 6 ) );
 
 	/**
 	 * Filters the localized weekday of the post, for display.
@@ -3473,10 +3479,11 @@ function the_weekday_date( $before = '', $after = '' ) {
 	}
 
 	$the_weekday_date = '';
+	$weekday_number   = get_post_time( 'w', false, $post );
 
-	if ( $currentday !== $previousweekday ) {
+	if ( false !== $weekday_number && $currentday !== $previousweekday ) {
 		$the_weekday_date .= $before;
-		$the_weekday_date .= $wp_locale->get_weekday( get_post_time( 'w', false, $post ) );
+		$the_weekday_date .= $wp_locale->get_weekday( clamp( (int) $weekday_number, 0, 6 ) );
 		$the_weekday_date .= $after;
 		$previousweekday   = $currentday;
 	}

tests/phpstan/baselines/argument.type.neon

@@ -953,11 +953,6 @@ parameters:
 			identifier: argument.type
 			count: 2
 			path: ../../../src/wp-includes/general-template.php
-		-
-			message: '#^Parameter \#1 \$weekday_number of method WP_Locale\:\:get_weekday\(\) expects int\<0, 6\>, string\|false given\.$#'
-			identifier: argument.type
-			count: 2
-			path: ../../../src/wp-includes/general-template.php
 		-
 			message: '#^Parameter \#2 \$replace of function str_replace expects array\<string\>\|string, int\<1, max\> given\.$#'
 			identifier: argument.type