Define a period

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How many working days in year 1989?

Here is the detail of the calculation:

Because 1989 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 252 working days in 1989.

Here is the list of these 8 public holidays:

1. Paasmaandag : Monday, 27 March, 1989
2. Dag van de Arbeid : Monday, 1 May, 1989
3. Hemelvaartsdag : Thursday, 4 May, 1989
4. Pinkstermaandag : Monday, 15 May, 1989
5. Nationale Feestdag : Friday, 21 July, 1989
6. Onze-Lieve-Vrouw Hemelvaart : Tuesday, 15 August, 1989
7. Allerheiligen : Wednesday, 1 November, 1989
8. Kerstmis : Monday, 25 December, 1989

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

1. Nieuwjaarsdag : Sunday, 1 January, 1989
2. Wapenstilstand : Saturday, 11 November, 1989