Define a period

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How many working days in year 1991?

Here is the detail of the calculation:

Because 1991 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 1991.

Here is the list of these 10 public holidays:

1. Anul Nou : Tuesday, 1 January, 1991
2. A doua zi după Anul Nou : Wednesday, 2 January, 1991
3. Ziua Unirii Principatelor Române : Thursday, 24 January, 1991
4. Vinerea Mare : Friday, 5 April, 1991
5. A doua zi de Paște : Monday, 8 April, 1991
6. Ziua Muncii : Wednesday, 1 May, 1991
7. A doua zi de Rusalii : Monday, 27 May, 1991
8. Adormirea Maicii Domnului : Thursday, 15 August, 1991
9. Crăciunul : Wednesday, 25 December, 1991
10. A doua zi de Crăciun : Thursday, 26 December, 1991

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

1. Paște ortodox : Sunday, 7 April, 1991
2. Rusalii : Sunday, 26 May, 1991
3. Ziua Copilului : Saturday, 1 June, 1991
4. Sfântul Andrei : Saturday, 30 November, 1991
5. Ziua Națională a României : Sunday, 1 December, 1991