Define a period

...

How many working days in year 1945?

Here is the detail of the calculation:

Because 1945 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 1945.

Here is the list of these 7 public holidays:

1. New Year's Day : Monday, 1 January, 1945
2. Good Friday : Friday, 30 March, 1945
3. Spring Day : Tuesday, 1 May, 1945
4. Independence Restoration Day : Monday, 20 August, 1945
5. Christmas Eve : Monday, 24 December, 1945
6. Christmas Day : Tuesday, 25 December, 1945
7. Second Day of Christmas : Wednesday, 26 December, 1945

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

1. Independence Day : Saturday, 24 February, 1945
2. Easter : Sunday, 1 April, 1945
3. Pentecost : Sunday, 20 May, 1945
4. Victory Day : Saturday, 23 June, 1945
5. Midsummer Day : Sunday, 24 June, 1945