Определить период

...

How many working days in year 1974?

Here is the detail of the calculation:

Because 1974 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 1974.

Here is the list of these 8 public holidays:

1. Pesach : воскресенье, 7 апрель, 1974
2. Yom Ha-Atzmaut : четверг, 25 апрель, 1974
3. Shavuot : понедельник, 27 май, 1974
4. Rosh Hashanah : вторник, 17 сентябрь, 1974
5. Rosh Hashanah : среда, 18 сентябрь, 1974
6. Yom Kippur : четверг, 26 сентябрь, 1974
7. Sukkot : вторник, 1 октябрь, 1974
8. Shemini Atzeret / Simchat Torah : вторник, 8 октябрь, 1974

And here is the public holiday falling on a weekend:

1. Shvi'i shel Pesach : суббота, 13 апрель, 1974