Google Calendar

Google calendar will help not to forget, not to miss and not to oversleep something important. With it, you can create a plan of the day, week, month and year. The calendar will remind you of all important events.

Record the dates of upcoming birthdays of friends and relatives, and the calendar can automatically select the dates of birthdays from your contacts in the phone.
To be informed about the dates of holidays in any country
Automatically remind you of events scheduled in other services, like Google+
Save information about the content and location of upcoming events and show them on the map.
You can include reminders and not one, but as many as you need, which will arrive in advance in the form of letters to your email.
In addition, you can invite and accept invitations from your friends, relatives and colleagues to events automatically by email.
You can also create several of your calendars to make it easier to distinguish between business, personal and other meetings and affairs.
Like all Google applications, the calendar interacts with other services. for example, with Google now, through which you can add events by voice or view upcoming events.

Detailed instructions for using this application are HERE.

In the Android system, this application is installed by default. If you have an iPhone, download it here: 

appstore

In the Android system, this application is installed by default. You can install this application on your iPhone by scanning this QR code:

Google Calendar