* YYYYMMDDHHMMSS
* 01234567890123
* @param DateTimeZone $zone Timezone of $ts
- * @param[out] int $ttl The amount of time (in seconds) the output may be cached for.
+ * @param int &$ttl The amount of time (in seconds) the output may be cached for.
* Only makes sense if $ts is the current time.
* @todo handling of "o" format character for Iranian, Hebrew, Hijri & Thai?
*