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How many working days in year 2117?
Here is the detail of the calculation:
Because 2117 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 4 public holidays that do not fall during a weekend and we obtain 257 working days in 2117.
 Here is the list of these 4 public holidays: 
 
 1. Новы год : Friday, 1 January, 2117 
2. Каляды праваслаўныя : Thursday, 7 January, 2117 
3. Мiжнародны жаночы дзень : Monday, 8 March, 2117 
4. Радунiца : Monday, 3 May, 2117 
And here are the 6 public holidays falling on a weekend:
1. Новы год : Saturday, 2 January, 2117 
2. Дзень працы : Saturday, 1 May, 2117 
3. Дзень Перамогi : Sunday, 9 May, 2117 
4. Дзень Незалежнасцi : Saturday, 3 July, 2117 
5. Дзень Кастрычніцкай рэвалюцыі : Sunday, 7 November, 2117 
6. Каляды каталiцкiя : Saturday, 25 December, 2117