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How many working days in year 1966?

Here is the detail of the calculation:

Because 1966 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 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 1966.

Here is the list of these 7 public holidays:

1. Pesach : вторник, 5 апрель, 1966
2. Shvi'i shel Pesach : понедельник, 11 апрель, 1966
3. Yom Ha-Atzmaut : понедельник, 25 апрель, 1966
4. Shavuot : среда, 25 май, 1966
5. Rosh Hashanah : четверг, 15 сентябрь, 1966
6. Sukkot : четверг, 29 сентябрь, 1966
7. Shemini Atzeret / Simchat Torah : четверг, 6 октябрь, 1966

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

1. Rosh Hashanah : пятница, 16 сентябрь, 1966
2. Yom Kippur : суббота, 24 сентябрь, 1966