Define a period

...

How many working days in year 1941?

Here is the detail of the calculation:

Because 1941 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1941.

Here is the list of these 10 public holidays:

1. Uusaasta : Wednesday, 1 January, 1941
2. Iseseisvuspäev : Monday, 24 February, 1941
3. Suur Reede : Friday, 11 April, 1941
4. Kevadpüha : Thursday, 1 May, 1941
5. Võidupüha : Monday, 23 June, 1941
6. Jaanipäev : Tuesday, 24 June, 1941
7. Taasiseseisvumispäev : Wednesday, 20 August, 1941
8. Jõululaupäev : Wednesday, 24 December, 1941
9. Esimene jõulupüha : Thursday, 25 December, 1941
10. Teine jõulupüha : Friday, 26 December, 1941

And here are the 2 public holidays falling on a weekend:

1. Ülestõusmispühad : Sunday, 13 April, 1941
2. Nelipühad : Sunday, 1 June, 1941