Define a period

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How many working days in year 2004?

Here is the detail of the calculation:

Because 2004 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 6 public holidays that do not fall during a weekend and we obtain 256 working days in 2004.

Here is the list of these 6 public holidays:

1. Nieuwjaar : Thursday, 1 January, 2004
2. Goede Vrijdag : Friday, 9 April, 2004
3. Tweede Paasdag : Monday, 12 April, 2004
4. Koninginnedag : Friday, 30 April, 2004
5. Hemelvaartsdag : Thursday, 20 May, 2004
6. Tweede Pinksterdag : Monday, 31 May, 2004

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

1. Eerste Paasdag : Sunday, 11 April, 2004
2. Eerste Pinksterdag : Sunday, 30 May, 2004
3. Eerste Kerstdag : Saturday, 25 December, 2004
4. Tweede Kerstdag : Sunday, 26 December, 2004