[English/Japanese/Chinese] Available quick manual for calculating day of week (28/56/84 method)

You do not know how to calculate the day of the week?  Why don’t you master 28/56/84 method?  It enables to calculate the day of week very quickly without memorizing huge amount of information.

English/Japanese/Chinese are all available.  Highly recommended!  Try!

• English
• Japanese (日本語)
• Chinese (中文)