Define a period

...

How many working days in year 1948?

Here is the detail of the calculation:

Because 1948 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 251 working days in 1948.

Here is the list of these 11 public holidays:

1. Нова година : Thursday, 1 January, 1948
2. Национален ден : Wednesday, 3 March, 1948
3. Православни Велики петък : Friday, 30 April, 1948
4. Православни Велики понеделник : Monday, 3 May, 1948
5. Гергьовден : Thursday, 6 May, 1948
6. Ден на културата и славянската писменост : Monday, 24 May, 1948
7. Ден на съединението : Monday, 6 September, 1948
8. Ден на независимостта : Wednesday, 22 September, 1948
9. Бъдни вечер : Friday, 24 December, 1948
10. Коледа (наблюдаван) : Monday, 27 December, 1948
11. Коледа (наблюдаван) : Tuesday, 28 December, 1948

And here are the 4 public holidays falling on a weekend:

1. Православна Велика събота : Saturday, 1 May, 1948
2. Православен Великден : Sunday, 2 May, 1948
3. Коледа : Saturday, 25 December, 1948
4. Втори ден на Коледа : Sunday, 26 December, 1948