Calendar apps are one of the most important utilities on a phone. Make app or library like google calendar app basic feature is get all event from gmail sync account which you done using ContentResolver and get all information about event like date, title, description and if two event is same in different gmail account then remove it. Second thing is to decide what is maximum and minimum date show you in your.
Just head back into the Calendar app's settings section — and this time, find the section for the Google account you want to modify and tap the "Events" line beneath it. That'll give you a screen on which you can change the default notification times for standard new events as well as all-day events.





If you're hunting for a calendar app with real aesthetic appeal, then check out iOS app Timepage The brainchild of Moleskine, the Italian manufacturers of the world's most stylish notebooks, it boasts a beautifully restrained, elegantly minimalist interface.
The main features of this Android calendar app include: different views (moth, day, week), synchronization with other calendar apps, holidays calendar, information about weather and your friends' birthdays, advanced reminders, advanced agenda and event search, 22 themes calendar app to choose from, possibility of adding over 600 emoticons to your events, lots of settings and customizations for reminders, tasks and events, possibility of sharing your events and tasks, support of conference call numbers, intuitive navigation and much more.

The very appropriately named Calendars is another iOS-only app — sorry, Android users — but is absolutely worth a mention for its elegant user interface and the way it manages to cram several days of information into a layout that isn't at all confusing.
It is given that this Calendar app provides the usual calendar app does, like the different calendar views, event and reminder creations, and so on. But the special thing about aCalendar is the improved overview of events, which is reminiscent of the old reliable organizer.

The features of this calendar app include: this is an offline calendar which will work just as well without the Internet connection in your phone, no integration with other calendars, easy creation of recurring events and reminders, customizable and resizable widgets, no ads or unnecessary permissions, simple and aesthetic looks, displaying week numbers and more.