Define a period

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How many working days in year 1972?

Here is the detail of the calculation:

Because 1972 is a leap year, it has 366 days.

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

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1972.

Here is the list of these 9 public holidays:

1. Ouschterméindeg : Monday, 3 April, 1972
2. Dag vun der Aarbecht : Monday, 1 May, 1972
3. Christi Himmelfaart : Thursday, 11 May, 1972
4. Péngschtméindeg : Monday, 22 May, 1972
5. Nationalfeierdag : Friday, 23 June, 1972
6. Léiffrawëschdag : Tuesday, 15 August, 1972
7. Allerhellegen : Wednesday, 1 November, 1972
8. Chrëschtdag : Monday, 25 December, 1972
9. Stiefesdag : Tuesday, 26 December, 1972

And here is the public holiday falling on a weekend:

1. Neijoerschdag : Saturday, 1 January, 1972