Calendar app in iOS can't set complex recurring events or arbitrary alert time.

Dear Administrator,

I find the Calendar app in iOS very limiting. It should not be difficult for Apple to include features that allows arbitrary alert time (45min before the event) or complex recurring events (repeat every 4 months on the first Thursday of the month). Do I miss something or Apple did not include these features in the system software. It is really inconvenient. Please help.

Sincerely yours,

Zigang Pan