Use Google Calendar for your teaching availability. Lesson slots will be created around appointents in your calendar. Lesson times are adapted automatically when you add new appointents.
Please note that you can sync a different calendar app with Google Calendar to use this feature.
Login and go to the home page of Google Calendar.Step 2
Select your calendar from 'My calendars' in the sidebar. Click 'Settings and sharing'.Step 3
Click 'Integrate calendar' from the sidebar in the Settings display.Step 4
Copy the URL listed in the 'Public address in iCal format'.
Google Calendar 'iCal' url.