Определить период

...

How many working days in year 1965?

Here is the detail of the calculation:

Because 1965 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1965.

Here is the list of these 7 public holidays:

1. New Year's Day : пятница, 1 январь, 1965
2. Independence Day : среда, 24 февраль, 1965
3. Good Friday : пятница, 16 апрель, 1965
4. Victory Day : среда, 23 июнь, 1965
5. Midsummer Day : четверг, 24 июнь, 1965
6. Independence Restoration Day : пятница, 20 август, 1965
7. Christmas Eve : пятница, 24 декабрь, 1965

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

1. Easter : воскресенье, 18 апрель, 1965
2. Spring Day : суббота, 1 май, 1965
3. Pentecost : воскресенье, 6 июнь, 1965
4. Christmas Day : суббота, 25 декабрь, 1965
5. Second Day of Christmas : воскресенье, 26 декабрь, 1965