Handy Calendar app for iPhone and iPad

Using diagrams and tests, you can easily learn how to calculate the day of the week for any date in the past or future using the amazing "finger calendar." This app contains 5 lessons beginners to the finger calendar technique. (Each lesson is unlocked in sequence.)

Contents:
-Lesson 1 After "n"
-Lesson 2 Position of each month
-Lesson 3 The process
-Lesson 4 Test
-Lesson 5 Zeller’s congruence

Features:
-Dominant hand compatibility
The finger calendar can be used with either hand, but not both. The app provides diagrams for both right and left hands. (Select dominant hand in Settings.)

-3 Tests
3 tests for measuring the users proficiency.

-Simulation function
You can simulate the procedure of the finger calendar for the questions with wrong answers on the tests, and actually view how the algorithm works.

-Intuitive diagrams
Abstracted diagrams allow for intuitive understanding.

-Originality
The finger calendar technique learned in this app is an original creation by the author based on improvements made to a technique found in folklore.

-Teaching material for mathematics
This technique is based on elements of adding natural numbers, greater than and less than relationships, and algorithms, and is suitable to be used as a teaching material in mathematics.