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How many working days in year 1957?

Here is the detail of the calculation:

Because 1957 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 1957.

Here is the list of these 8 public holidays:

1. Purim : воскресенье, 17 март, 1957
2. Pesach : вторник, 16 апрель, 1957
3. Shvi'i shel Pesach : понедельник, 22 апрель, 1957
4. Yom Ha-Atzmaut : понедельник, 6 май, 1957
5. Shavuot : среда, 5 июнь, 1957
6. Rosh Hashanah : четверг, 26 сентябрь, 1957
7. Sukkot : четверг, 10 октябрь, 1957
8. Shemini Atzeret / Simchat Torah : четверг, 17 октябрь, 1957

And here are the 2 public holidays falling on a weekend:

1. Rosh Hashanah : пятница, 27 сентябрь, 1957
2. Yom Kippur : суббота, 5 октябрь, 1957