Определить период

...

How many working days in year 1960?

Here is the detail of the calculation:

Because 1960 is a leap year, it has 366 days.

Let's remove 53 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 1960.

Here is the list of these 7 public holidays:

1. New Year's Day : пятница, 1 январь, 1960
2. Good Friday : пятница, 15 апрель, 1960
3. Easter Monday : понедельник, 18 апрель, 1960
4. Liberation Day : четверг, 5 май, 1960
5. Ascension Day : четверг, 26 май, 1960
6. Pentecost Monday : понедельник, 6 июнь, 1960
7. Boxing Day : понедельник, 26 декабрь, 1960

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

1. Easter Sunday : воскресенье, 17 апрель, 1960
2. Queen's Day : суббота, 30 апрель, 1960
3. Pentecost Sunday : воскресенье, 5 июнь, 1960
4. Christmas Day : воскресенье, 25 декабрь, 1960