Определить период

...

How many working days in year 1970?

Here is the detail of the calculation:

Because 1970 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1970.

Here is the list of these 9 public holidays:

1. New Year's Day : четверг, 1 январь, 1970
2. 2nd January : пятница, 2 январь, 1970
3. Good Friday : пятница, 27 март, 1970
4. Early May Bank Holiday : понедельник, 4 май, 1970
5. Spring Bank Holiday : понедельник, 25 май, 1970
6. Summer Bank Holiday : понедельник, 3 август, 1970
7. St Andrew's Day : понедельник, 30 ноябрь, 1970
8. Christmas Day : пятница, 25 декабрь, 1970
9. Boxing Day (substitute day) : понедельник, 28 декабрь, 1970