added language strings to langconfig for date formats, added format_date

function

htdocs/lang/en.utf8/langconfig.php

@@ -27,17 +27,17 @@
 defined('INTERNAL') || die();
 
 $string['parentlanguage'] = '';
-$string['strftimedate']  = '';
-$string['strftimedateshort']  = '';
-$string['strftimedatetime'] = '';
-$string['strftimedaydate'] = '',
-$string['strftimedaydatetime'] = '';
-$string['strftimedayshort'] = '';
-$string['strftimedaytime'] = '';
-$string['strftimemonthyear'] = '';
-$string['strftimerecent'] = '';
-$string['strftimerecentfull'] = '';
-$string['strftimetime'] = '';
+$string['strftimedate'] = '%%d %%B %%Y';
+$string['strftimedateshort'] = '%%d %%B';
+$string['strftimedatetime'] = '%%d %%B %%Y, %%I:%%M %%p';
+$string['strftimedaydate'] = '%%A, %%d %%B %%Y';
+$string['strftimedaydatetime'] = '%%A, %%d %%B %%Y, %%I:%%M %%p';
+$string['strftimedayshort'] = '%%A, %%d %%B';
+$string['strftimedaytime'] = '%%a, %%H:%%M';
+$string['strftimemonthyear'] = '%%B %%Y';
+$string['strftimerecent'] = '%%d %%b, %%H:%%M';
+$string['strftimerecentfull'] = '%%a, %%d %%b %%Y, %%I:%%M %%p';
+$string['strftimetime'] = '%%I:%%M %%p';
 $string['thislanguage'] = 'English';
 
 

htdocs/lib/mahara.php

@@ -891,4 +891,17 @@ function fullname($user) {
     // @todo
 }
 
+/**
+ * formats a unix timestamp to a nice date format.
+ * 
+ * @param int $date unix timestamp to format
+ * @param string $formatkey language key to fetch the format from
+ * (see langconfig.php or the top of {@link get_string_location}
+ * for supported keys
+ */
+
+function format_date($date, $formatkey='strftimedatetime') {
+    return strftime(get_string($formatkey), $date);
+}
+
 ?>