定义一个时期

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How many working days in year 2021?

Here is the detail of the calculation:

Because 2021 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2021.

Here is the list of these 10 public holidays:

1. Neujahrstag : 星期五, 2021, 01, 1
2. Heilige Drei Könige : 星期三, 2021, 01, 6
3. Ostermontag : 星期一, 2021, 04, 5
4. Christi Himmelfahrt : 星期四, 2021, 05, 13
5. Pfingstmontag : 星期一, 2021, 05, 24
6. Fronleichnam : 星期四, 2021, 06, 3
7. St. Rupert : 星期五, 2021, 09, 24
8. Nationalfeiertag : 星期二, 2021, 10, 26
9. Allerheiligen : 星期一, 2021, 11, 1
10. Mariä Empfängnis : 星期三, 2021, 12, 8

And here are the 4 public holidays falling on a weekend:

1. Staatsfeiertag : 星期六, 2021, 05, 1
2. Mariä Himmelfahrt : 星期日, 2021, 08, 15
3. Weihnachten : 星期六, 2021, 12, 25
4. Stefanitag : 星期日, 2021, 12, 26