Labor Law of the standard working hours 21.75 days, five days a week working system, which is the document …

Since the implementation of the new labor law, labor dispute has been, but I found this concept very clearly, so I would like to ask you next:1, the Labor Law of the standard working hours 21.75 days is how to calculate it? 2, five days a week working system is Since when have implemented? As far as I know most of the enterprise system is six days.These systems is a document which specific requirements?
Thank you!

(1) 21.75 days of the year is calculated to remove Shuangxiu (excluding national holidays) after the draw on The average working day, the daily wage is calculated on the basis of this, that is, the monthly salary / = 21.75 days.
(2) working 5 days a week is the implementation of N years ago, and now many Taiwan enterprises to implement a six-day Work, work is considered overtime Saturday, but there are not norms:workers work overtime should be voluntary, but some units if it is not to go to work Saturday but had to Kouqian.This is a violation of labor law.
File If the local labor and social security net can be found