Определить период

...

How many working days in year 1901?

Here is the detail of the calculation:

Because 1901 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1901.

Here is the list of these 8 public holidays:

1. New Year's Day : вторник, 1 январь, 1901
2. Good Friday : пятница, 5 апрель, 1901
3. Easter Monday : понедельник, 8 апрель, 1901
4. Queen's Day : вторник, 30 апрель, 1901
5. Ascension Day : четверг, 16 май, 1901
6. Pentecost Monday : понедельник, 27 май, 1901
7. Christmas Day : среда, 25 декабрь, 1901
8. Boxing Day : четверг, 26 декабрь, 1901

And here are the 3 public holidays falling on a weekend:

1. Easter Sunday : воскресенье, 7 апрель, 1901
2. Liberation Day : воскресенье, 5 май, 1901
3. Pentecost Sunday : воскресенье, 26 май, 1901