Define a period

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How many working days in year 1973?

Here is the detail of the calculation:

Because 1973 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1973.

Here is the list of these 8 public holidays:

1. Nieuwjaarsdag : Monday, 1 January, 1973
2. Paasmaandag : Monday, 23 April, 1973
3. Dag van de Arbeid : Tuesday, 1 May, 1973
4. Hemelvaartsdag : Thursday, 31 May, 1973
5. Pinkstermaandag : Monday, 11 June, 1973
6. Onze-Lieve-Vrouw Hemelvaart : Wednesday, 15 August, 1973
7. Allerheiligen : Thursday, 1 November, 1973
8. Kerstmis : Tuesday, 25 December, 1973

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

1. Nationale Feestdag : Saturday, 21 July, 1973
2. Wapenstilstand : Sunday, 11 November, 1973