The calendar includes the full calendar of feast and saints. It does not require internet connection, so it will display the feast, or the saint of the day, even if you are on Sinai or Mount Athos 🙂
The calendar can be set to follow both the New (Gregorian) and the Old (Julian) calendar style, check the menu.
Fasting rules are also displayed, but you are kindly asked not too rely too much on them, they are accurate, but you should consult your priest for the details.
A link to the Prologue of Ohrid of St Nikolai Velimirovic for each day is also included.