Определить период

...

How many working days in year 1923?

Here is the detail of the calculation:

Because 1923 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 1923.

Here is the list of these 8 public holidays:

1. Pesach : воскресенье, 1 апрель, 1923
2. Yom Ha-Atzmaut : четверг, 19 апрель, 1923
3. Shavuot : понедельник, 21 май, 1923
4. Rosh Hashanah : вторник, 11 сентябрь, 1923
5. Rosh Hashanah : среда, 12 сентябрь, 1923
6. Yom Kippur : четверг, 20 сентябрь, 1923
7. Sukkot : вторник, 25 сентябрь, 1923
8. Shemini Atzeret / Simchat Torah : вторник, 2 октябрь, 1923

And here is the public holiday falling on a weekend:

1. Shvi'i shel Pesach : суббота, 7 апрель, 1923