change date format

serendipity_lang_ja.inc.php.diff

diff --git a/lang/UTF-8/serendipity_lang_ja.inc.php b/lang/UTF-8/serendipity_lang_ja.inc.php
index 258005f..a5b8c3f 100644
--- a/lang/UTF-8/serendipity_lang_ja.inc.php
+++ b/lang/UTF-8/serendipity_lang_ja.inc.php
@@ -7,7 +7,7 @@
 @define('LANG_CHARSET', 'UTF-8');
 @define('SQL_CHARSET', 'utf8');
 @define('DATE_LOCALES', 'ja_JP.UTF-8,ja,jp');
-@define('DATE_FORMAT_ENTRY', '%Y年 %B %e(%A)');
+@define('DATE_FORMAT_ENTRY', '%Y-%m-%d');
 @define('DATE_FORMAT_SHORT', '%Y-%m-%d %H:%M');
 @define('WYSIWYG_LANG', 'ja-utf8');
 @define('NUMBER_FORMAT_DECIMALS', '2');