Определить период

...

How many working days in year 1931?

Here is the detail of the calculation:

Because 1931 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 1931.

Here is the list of these 9 public holidays:

1. Neujahrstag : четверг, 1 январь, 1931
2. Karfreitag : пятница, 3 апрель, 1931
3. Ostermontag : понедельник, 6 апрель, 1931
4. Staatsfeiertag : пятница, 1 май, 1931
5. Pfingstmontag : понедельник, 25 май, 1931
6. Nationalfeiertag : понедельник, 26 октябрь, 1931
7. Heiliger Abend : четверг, 24 декабрь, 1931
8. Weihnachten : пятница, 25 декабрь, 1931
9. Silvesters : четверг, 31 декабрь, 1931

And here is the public holiday falling on a weekend:

1. Stefanitag : суббота, 26 декабрь, 1931