Calendar is an android application which, as the name says is a calendar application but also have many more features like
Keep a to do list
It also supports
Sync with your Google calendar
Import your friends’ birthdays from Facebook and contact
Diary - notes and photos
Sharing with friends
You can get a life time subscription for free just today via App of the day. To get the life time subscription you can use the Promotion code from appoftheday on the settings of Calendar+.
Calendar＋ is not only a simple calendar but also your powerful assistant which synchronizes with your Google calendars! What’s more, you can import your friends’ birthdays from Facebook or contact by one-click! Combining calendar, unlimited note, alarm, Weather, Must-remember events, To-do list and festival, Calendar Plus is designed to be your best cloud storage.
Here is the Play store link to Calendar+ and App of the day