定义一个时期

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How many working days in year 1985?

Here is the detail of the calculation:

Because 1985 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 5 public holidays that do not fall during a weekend and we obtain 256 working days in 1985.

Here is the list of these 5 public holidays:

1. New Year's Day : 1985年1月1日星期二
2. Good Friday : 1985年4月5日星期五
3. Labour Day : 1985年5月1日星期三
4. National Day : 1985年8月9日星期五
5. Christmas Day : 1985年12月25日星期三