Define a period

...

How many working days in year 1915?

Here is the detail of the calculation:

Because 1915 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1915.

Here is the list of these 7 public holidays:

1. New Year's Day : Friday, 1 January, 1915
2. Independence Day : Wednesday, 24 February, 1915
3. Good Friday : Friday, 2 April, 1915
4. Victory Day : Wednesday, 23 June, 1915
5. Midsummer Day : Thursday, 24 June, 1915
6. Independence Restoration Day : Friday, 20 August, 1915
7. Christmas Eve : Friday, 24 December, 1915

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

1. Easter : Sunday, 4 April, 1915
2. Spring Day : Saturday, 1 May, 1915
3. Pentecost : Sunday, 23 May, 1915
4. Christmas Day : Saturday, 25 December, 1915
5. Second Day of Christmas : Sunday, 26 December, 1915