From a0ce4d6e19891c0bb0151766a82958ff47b1eead Mon Sep 17 00:00:00 2001
From: mt8 <info@mt8.biz>
Date: Mon, 27 Apr 2026 21:08:35 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=E6=97=A5=E4=BB=98=E3=83=90=E3=82=A4?=
 =?UTF-8?q?=E3=83=B3=E3=83=87=E3=82=A3=E3=83=B3=E3=82=B0=E3=81=8C=20locale?=
 =?UTF-8?q?=20=E3=81=A7=E6=9B=9C=E6=97=A5/=E6=9C=88=E5=90=8D=E3=82=92?=
 =?UTF-8?q?=E7=BF=BB=E8=A8=B3=E3=81=99=E3=82=8B=E5=95=8F=E9=A1=8C=E3=82=92?=
 =?UTF-8?q?=E4=BF=AE=E6=AD=A3=20(#1)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

wp_date() / get_the_date() が D / M / l / F format を site locale に
翻訳するため、{{feed.last_build_date:r}} の出力が ja で
"月, 27 4月 2026 ..." になっていた。RFC 2822 / RFC 3339 は曜日/月名が
英語固定なので、PHP の date() 同等の挙動が必要。

DateTimeImmutable::format() でサイトタイムゾーンに変換しつつ常に英語名
を出す Feedwright\Bindings\DateFormatter を追加し、FeedProvider /
NowProvider / PostProvider / PostRawProvider の wp_date 呼び出しを
全てこちらに差し替えた。

実機確認 (locale=ja):
- {{now:r}}                 → Mon, 27 Apr 2026 21:08:20 +0900 ✓
- {{feed.last_build_date:r}} → Mon, 27 Apr 2026 21:08:20 +0900 ✓

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 src/Bindings/DateFormatter.php             | 44 ++++++++++++++++++++++
 src/Bindings/Providers/FeedProvider.php    |  3 +-
 src/Bindings/Providers/NowProvider.php     |  3 +-
 src/Bindings/Providers/PostProvider.php    | 11 +++++-
 src/Bindings/Providers/PostRawProvider.php |  3 +-
 5 files changed, 59 insertions(+), 5 deletions(-)
 create mode 100644 src/Bindings/DateFormatter.php

diff --git a/src/Bindings/DateFormatter.php b/src/Bindings/DateFormatter.php
new file mode 100644
index 0000000..f39e208
--- /dev/null
+++ b/src/Bindings/DateFormatter.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * Locale-independent date formatter for binding providers.
+ *
+ * @package Feedwright
+ */
+
+declare(strict_types=1);
+
+namespace Feedwright\Bindings;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Format Unix timestamps with the site timezone but English day/month names.
+ *
+ * `wp_date()` (and helpers like `get_the_date()` that wrap it) translate
+ * `D` / `M` / `l` / `F` format characters to the site locale. That breaks
+ * format strings such as `r` (RFC 2822) and `D, d M Y H:i:s O`, which the
+ * RFC 2822 / RFC 3339 specs require to be in English regardless of locale.
+ *
+ * This helper uses `DateTimeImmutable::format()` instead, which always
+ * produces English names — exactly matching PHP's bare `date()` behavior.
+ * Numeric formats (`Y`, `m`, `d`, etc.) are unaffected either way.
+ */
+final class DateFormatter {
+
+	/**
+	 * Format a Unix timestamp as a string using the given PHP date format.
+	 *
+	 * @param int                       $timestamp Unix timestamp (UTC).
+	 * @param string                    $format    PHP date format string.
+	 * @param \DateTimeZone|string|null $timezone  Output timezone. Defaults to site timezone.
+	 */
+	public static function format( int $timestamp, string $format, $timezone = null ): string {
+		if ( null === $timezone ) {
+			$timezone = wp_timezone();
+		} elseif ( is_string( $timezone ) ) {
+			$timezone = new \DateTimeZone( $timezone );
+		}
+		$dt = ( new \DateTimeImmutable( '@' . $timestamp ) )->setTimezone( $timezone );
+		return $dt->format( $format );
+	}
+}
diff --git a/src/Bindings/Providers/FeedProvider.php b/src/Bindings/Providers/FeedProvider.php
index fe9ce8a..f5e17e4 100644
--- a/src/Bindings/Providers/FeedProvider.php
+++ b/src/Bindings/Providers/FeedProvider.php
@@ -11,6 +11,7 @@
 
 use Feedwright\Renderer\Context;
 use Feedwright\Routing\FeedEndpoint;
+use Feedwright\Bindings\DateFormatter;
 use Feedwright\Bindings\ProviderInterface;
 
 defined( 'ABSPATH' ) || exit;
@@ -86,7 +87,7 @@ private function compute_last_build_date( \WP_Post $feed_post ): int {
 	 */
 	private function format_date( int $timestamp, string $modifier ): string {
 		$format = '' === $modifier ? 'r' : $modifier;
-		return (string) wp_date( $format, $timestamp );
+		return DateFormatter::format( $timestamp, $format );
 	}
 
 	/**
diff --git a/src/Bindings/Providers/NowProvider.php b/src/Bindings/Providers/NowProvider.php
index 875657e..97d6049 100644
--- a/src/Bindings/Providers/NowProvider.php
+++ b/src/Bindings/Providers/NowProvider.php
@@ -10,6 +10,7 @@
 namespace Feedwright\Bindings\Providers;
 
 use Feedwright\Renderer\Context;
+use Feedwright\Bindings\DateFormatter;
 use Feedwright\Bindings\ProviderInterface;
 
 defined( 'ABSPATH' ) || exit;
@@ -41,7 +42,7 @@ public function resolve( string $path, string $modifier, Context $ctx ): ?string
 			return null;
 		}
 		$format = '' === $modifier ? 'c' : $modifier;
-		return (string) wp_date( $format );
+		return DateFormatter::format( time(), $format );
 	}
 
 	/**
diff --git a/src/Bindings/Providers/PostProvider.php b/src/Bindings/Providers/PostProvider.php
index 30cc2b9..7fc5727 100644
--- a/src/Bindings/Providers/PostProvider.php
+++ b/src/Bindings/Providers/PostProvider.php
@@ -10,6 +10,7 @@
 namespace Feedwright\Bindings\Providers;
 
 use Feedwright\Renderer\Context;
+use Feedwright\Bindings\DateFormatter;
 use Feedwright\Bindings\ProviderInterface;
 
 defined( 'ABSPATH' ) || exit;
@@ -50,9 +51,15 @@ public function resolve( string $path, string $modifier, Context $ctx ): ?string
 			case 'post_excerpt':
 				return (string) get_the_excerpt( $post );
 			case 'post_date':
-				return (string) get_the_date( '' === $modifier ? 'c' : $modifier, $post );
+				return DateFormatter::format(
+					(int) get_post_time( 'U', true, $post ),
+					'' === $modifier ? 'c' : $modifier
+				);
 			case 'post_modified':
-				return (string) get_the_modified_date( '' === $modifier ? 'c' : $modifier, $post );
+				return DateFormatter::format(
+					(int) get_post_modified_time( 'U', true, $post ),
+					'' === $modifier ? 'c' : $modifier
+				);
 			case 'post_status':
 				return (string) get_post_status( $post );
 			case 'post_name':
diff --git a/src/Bindings/Providers/PostRawProvider.php b/src/Bindings/Providers/PostRawProvider.php
index 0164e6b..b1bb646 100644
--- a/src/Bindings/Providers/PostRawProvider.php
+++ b/src/Bindings/Providers/PostRawProvider.php
@@ -10,6 +10,7 @@
 namespace Feedwright\Bindings\Providers;
 
 use Feedwright\Renderer\Context;
+use Feedwright\Bindings\DateFormatter;
 use Feedwright\Bindings\ProviderInterface;
 
 defined( 'ABSPATH' ) || exit;
@@ -79,7 +80,7 @@ public function resolve( string $path, string $modifier, Context $ctx ): ?string
 			if ( false === $date_time ) {
 				return $raw;
 			}
-			return (string) wp_date( $modifier, $date_time->getTimestamp(), $timezone );
+			return DateFormatter::format( $date_time->getTimestamp(), $modifier, $timezone );
 		}
 
 		return null;