Define a period

...

How many working days in year 1993?

Here is the detail of the calculation:

Because 1993 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 6 public holidays that do not fall during a weekend and we obtain 255 working days in 1993.

Here is the list of these 6 public holidays:

1. Nieuwjaar : Friday, 1 January, 1993
2. Goede Vrijdag : Friday, 9 April, 1993
3. Tweede Paasdag : Monday, 12 April, 1993
4. Koninginnedag : Friday, 30 April, 1993
5. Hemelvaartsdag : Thursday, 20 May, 1993
6. Tweede Pinksterdag : Monday, 31 May, 1993

And here are the 4 public holidays falling on a weekend:

1. Eerste Paasdag : Sunday, 11 April, 1993
2. Eerste Pinksterdag : Sunday, 30 May, 1993
3. Eerste Kerstdag : Saturday, 25 December, 1993
4. Tweede Kerstdag : Sunday, 26 December, 1993