Define a period

...

How many working days in year 2105?

Here is the detail of the calculation:

Because 2105 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2105.

Here is the list of these 9 public holidays:

1. Nieuwjaarsdag : Thursday, 1 January, 2105
2. Paasmaandag : Monday, 6 April, 2105
3. Dag van de Arbeid : Friday, 1 May, 2105
4. Irisfeest : Friday, 8 May, 2105
5. Hemelvaartsdag : Thursday, 14 May, 2105
6. Pinkstermaandag : Monday, 25 May, 2105
7. Nationale Feestdag : Tuesday, 21 July, 2105
8. Wapenstilstand : Wednesday, 11 November, 2105
9. Kerstmis : Friday, 25 December, 2105

And here are the 2 public holidays falling on a weekend:

1. Onze-Lieve-Vrouw Hemelvaart : Saturday, 15 August, 2105
2. Allerheiligen : Sunday, 1 November, 2105