Define a period

...

How many working days in year 1975?

Here is the detail of the calculation:

Because 1975 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1975.

Here is the list of these 9 public holidays:

1. New Year's Day : Wednesday, 1 January, 1975
2. Easter Monday : Monday, 31 March, 1975
3. Labour Day : Thursday, 1 May, 1975
4. Ascension Day : Thursday, 8 May, 1975
5. Whit Monday : Monday, 19 May, 1975
6. National Day : Monday, 23 June, 1975
7. Assumption of Mary : Friday, 15 August, 1975
8. Christmas Day : Thursday, 25 December, 1975
9. St. Stephen's Day : Friday, 26 December, 1975

And here is the public holiday falling on a weekend:

1. All Saints' Day : Saturday, 1 November, 1975