From 2f2bdad9127abc2b2cc09aecdc5f37e06793e561 Mon Sep 17 00:00:00 2001
From: Shinjiman <shinjiman@users.mediawiki.org>
Date: Tue, 19 May 2009 16:38:21 +0000
Subject: [PATCH] added Minguo calendar support for the Taiwan Chinese language

---
 languages/Language.php               | 28 +++++++++++++++++++++++++++-
 languages/messages/MessagesZh_tw.php | 23 +++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/languages/Language.php b/languages/Language.php
index e296d901f8..aa96d6f87b 100644
--- a/languages/Language.php
+++ b/languages/Language.php
@@ -567,6 +567,8 @@ class Language {
 	 *
 	 *    xkY  Y (full year) in Thai solar calendar. Months and days are
 	 *                       identical to the Gregorian calendar
+	 *    xoY  Y (full year) in Minguo calendar. Months and days are
+	 *                       identical to the Gregorian calendar
 	 *
 	 * Characters enclosed in double quotes will be considered literal (with
 	 * the quotes themselves removed). Unmatched quotes will be considered
@@ -598,6 +600,7 @@ class Language {
 		$hebrew = false;
 		$hijri = false;
 		$thai = false;
+		$minguo = false;
 		for ( $p = 0; $p < strlen( $format ); $p++ ) {
 			$num = false;
 			$code = $format[$p];
@@ -605,7 +608,7 @@ class Language {
 				$code .= $format[++$p];
 			}
 
-			if ( ( $code === 'xi' || $code == 'xj' || $code == 'xk' || $code == 'xm' ) && $p < strlen( $format ) - 1 ) {
+			if ( ( $code === 'xi' || $code == 'xj' || $code == 'xk' || $code == 'xm' || $code == 'xo' ) && $p < strlen( $format ) - 1 ) {
 				$code .= $format[++$p];
 			}
 
@@ -752,6 +755,10 @@ class Language {
 					if ( !$thai ) $thai = self::tsToThai( $ts );
 					$num = $thai[0];
 					break;
+				case 'xoY':
+					if ( !$minguo ) $minguo = self::tsToMinguo( $ts );
+					$num = $minguo[0];
+					break;
 				case 'y':
 					$num = substr( $ts, 2, 2 );
 					break;
@@ -1132,6 +1139,25 @@ class Language {
 		return array( $gy_thai, $gm, $gd );
 	}
 
+	/**
+	 * Algorithm to convert Gregorian dates to Minguo dates.
+	 *
+	 * Link: http://en.wikipedia.org/wiki/Minguo_calendar
+	 *
+	 * @param $ts String: 14-character timestamp
+	 * @return array converted year, month, day
+	 */
+	private static function tsToMinguo( $ts ) {
+		$gy = substr( $ts, 0, 4 );
+		$gm = substr( $ts, 4, 2 );
+		$gd = substr( $ts, 6, 2 );
+
+		# Deduct 1911 years from the Gregorian calendar
+		# Months and days are identical
+		$gy_minguo = $gy - 1911;
+
+		return array( $gy_minguo, $gm, $gd );
+	}
 
 	/**
 	 * Roman number formatting up to 3000
diff --git a/languages/messages/MessagesZh_tw.php b/languages/messages/MessagesZh_tw.php
index a39a7d9ef4..a83a503268 100644
--- a/languages/messages/MessagesZh_tw.php
+++ b/languages/messages/MessagesZh_tw.php
@@ -38,6 +38,29 @@ $namespaceNames = array(
 	NS_CATEGORY_TALK    => '分類討論'
 );
 
+$datePreferences = array(
+	'default',
+	'minguo',
+	'CNS 7648',
+	'ISO 8601',
+);
+
+$defaultDateFormat = 'zh';
+
+$dateFormats = array(
+	'zh time' => 'H:i',
+	'zh date' => 'Y年n月j日 (l)',
+	'zh both' => 'Y年n月j日 (D) H:i',
+
+	'minguo time' => 'H:i',
+	'minguo date' => 'xoY年n月j日 (l)',
+	'minguo both' => 'xoY年n月j日 (D) H:i',
+
+	'CNS 7648 time' => 'H:i',
+	'CNS 7648 date' => 'R.O.C. xoY-m-d (l)',
+	'CNS 7648 both' => 'R.O.C. xoY-m-d (D) H:i',
+);
+
 $messages = array(
 # User preference toggles
 'tog-underline'            => '鏈結標注底線',
-- 
2.20.1