diff --git a/build.php b/build.php
index 9f0c717..35f0e2d 100755
--- a/build.php
+++ b/build.php
@@ -13,6 +13,10 @@
 -----------
 
 EOT;
+	if (file_exists('package.xml.old')) {
+		file_put_contents('package.xml', file_get_contents('package.xml.old'));
+		unlink('package.xml.old');
+	}
 	if (file_exists('file.tar')) unlink('file.tar');
 	if (file_exists('template.tar')) unlink('template.tar');
 	if (file_exists('acptemplate.tar')) unlink('acptemplate.tar');
@@ -70,7 +74,13 @@
 -----------------
 
 EOT;
-	passthru('tar cvf ../file.tar * --exclude=*.coffee --exclude=*.scss --exclude=.sass-cache', $code);
+	file_put_contents('package.xml.old', file_get_contents('package.xml'));
+	file_put_contents('package.xml', preg_replace('~<date>\d{4}-\d{2}-\d{2}</date>~', '<date>'.date('Y-m-d').'</date>', file_get_contents('package.xml')));
+	passthru('tar cvf ../file.tar * --exclude=*.old --exclude=*.coffee --exclude=*.scss --exclude=.sass-cache', $code);
+	if (file_exists('package.xml.old')) {
+		file_put_contents('package.xml', file_get_contents('package.xml.old'));
+		unlink('package.xml.old');
+	}
 	if ($code != 0) exit($code);
 echo <<<EOT