Date component Joomla

I am looking for someone to write me a date script for Joomla! Or maybe your own PHP script! There are users themselves can add an appointment, just like a birthday, but just for a certain time! The user should vary depending on setting, get a notification by mail, which is due to the appointment, the administrator should also get an email that the user has the time to speak to an exact time. Unfortunately I can describe, because english is not so good on me, and I translated it with google. Please indicate whether they can speak German I am grateful for deals