Define a period

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How many working days in year 1974?

Here is the detail of the calculation:

Because 1974 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1974.

Here is the list of these 8 public holidays:

1. Uudenvuodenpäivä : Tuesday, 1 January, 1974
2. Pitkäperjantai : Friday, 12 April, 1974
3. 2. pääsiäispäivä : Monday, 15 April, 1974
4. Vappu : Wednesday, 1 May, 1974
5. Helatorstai : Thursday, 23 May, 1974
6. Itsenäisyyspäivä : Friday, 6 December, 1974
7. Joulupäivä : Wednesday, 25 December, 1974
8. Tapaninpäivä : Thursday, 26 December, 1974

And here are the 5 public holidays falling on a weekend:

1. Loppiainen : Sunday, 6 January, 1974
2. Pääsiäispäivä : Sunday, 14 April, 1974
3. Helluntaipäivä : Sunday, 2 June, 1974
4. Juhannuspäivä : Saturday, 22 June, 1974
5. Pyhäinpäivä : Saturday, 2 November, 1974