Define a period

...

How many working days in year 1968?

Here is the detail of the calculation:

Because 1968 is a leap year, it has 366 days.

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

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 253 working days in 1968.

Here is the list of these 9 public holidays:

1. Neijoerschdag : Monday, 1 January, 1968
2. Ouschterméindeg : Monday, 15 April, 1968
3. Dag vun der Aarbecht : Wednesday, 1 May, 1968
4. Christi Himmelfaart : Thursday, 23 May, 1968
5. Péngschtméindeg : Monday, 3 June, 1968
6. Léiffrawëschdag : Thursday, 15 August, 1968
7. Allerhellegen : Friday, 1 November, 1968
8. Chrëschtdag : Wednesday, 25 December, 1968
9. Stiefesdag : Thursday, 26 December, 1968

And here is the public holiday falling on a weekend:

1. Nationalfeierdag : Sunday, 23 June, 1968