Deprecate Date helper standard_date()
diff --git a/system/helpers/date_helper.php b/system/helpers/date_helper.php
index 6686089..a45b3d7 100644
--- a/system/helpers/date_helper.php
+++ b/system/helpers/date_helper.php
@@ -117,6 +117,19 @@
*
* Returns a date formatted according to the submitted standard.
*
+ * As of PHP 5.2, the DateTime extension provides constants that
+ * serve for the exact same purpose and are used with date().
+ * Due to that, this function is DEPRECATED and should be removed
+ * in CodeIgniter 3.1+.
+ *
+ * Here are two examples of how you should replace it:
+ *
+ * date(DATE_RFC822, now()); // default
+ * date(DATE_W3C, $time); // a different format and time
+ *
+ * Reference: http://www.php.net/manual/en/class.datetime.php#datetime.constants.types
+ *
+ * @deprecated
* @param string the chosen format
* @param int Unix timestamp
* @return string