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How many working days in year 1983?

Here is the detail of the calculation:

Because 1983 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 1983.

Here is the list of these 7 public holidays:

1. Pesach : вторник, 29 март, 1983
2. Shvi'i shel Pesach : понедельник, 4 апрель, 1983
3. Yom Ha-Atzmaut : понедельник, 18 апрель, 1983
4. Shavuot : среда, 18 май, 1983
5. Rosh Hashanah : четверг, 8 сентябрь, 1983
6. Sukkot : четверг, 22 сентябрь, 1983
7. Shemini Atzeret / Simchat Torah : четверг, 29 сентябрь, 1983

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

1. Rosh Hashanah : пятница, 9 сентябрь, 1983
2. Yom Kippur : суббота, 17 сентябрь, 1983