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How many working days in year 1971?

Here is the detail of the calculation:

Because 1971 is not a leap year, it has 365 days.

Let's remove 53 saturdays and 52 sundays. It remains 260 days.

Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1971.

Here is the list of these 7 public holidays:

1. Yom Ha-Atzmaut : четверг, 29 апрель, 1971
2. Shavuot : воскресенье, 30 май, 1971
3. Rosh Hashanah : понедельник, 20 сентябрь, 1971
4. Rosh Hashanah : вторник, 21 сентябрь, 1971
5. Yom Kippur : среда, 29 сентябрь, 1971
6. Sukkot : понедельник, 4 октябрь, 1971
7. Shemini Atzeret / Simchat Torah : понедельник, 11 октябрь, 1971

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

1. Pesach : суббота, 10 апрель, 1971
2. Shvi'i shel Pesach : пятница, 16 апрель, 1971