Define a period

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How many working days in year 1956?

Here is the detail of the calculation:

Because 1956 is a leap year, it has 366 days.

Let's remove 52 saturdays and 53 sundays. It remains 261 days.

Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1956.

Here is the list of these 7 public holidays:

1. Paasmaandag : Monday, 2 April, 1956
2. Dag van de Arbeid : Tuesday, 1 May, 1956
3. Hemelvaartsdag : Thursday, 10 May, 1956
4. Pinkstermaandag : Monday, 21 May, 1956
5. Onze-Lieve-Vrouw Hemelvaart : Wednesday, 15 August, 1956
6. Allerheiligen : Thursday, 1 November, 1956
7. Kerstmis : Tuesday, 25 December, 1956

And here are the 3 public holidays falling on a weekend:

1. Nieuwjaarsdag : Sunday, 1 January, 1956
2. Nationale Feestdag : Saturday, 21 July, 1956
3. Wapenstilstand : Sunday, 11 November, 1956