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How many working days in year 1973?

Here is the detail of the calculation:

Because 1973 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 1973.

Here is the list of these 8 public holidays:

1. Purim : воскресенье, 18 март, 1973
2. Pesach : вторник, 17 апрель, 1973
3. Shvi'i shel Pesach : понедельник, 23 апрель, 1973
4. Yom Ha-Atzmaut : понедельник, 7 май, 1973
5. Shavuot : среда, 6 июнь, 1973
6. Rosh Hashanah : четверг, 27 сентябрь, 1973
7. Sukkot : четверг, 11 октябрь, 1973
8. Shemini Atzeret / Simchat Torah : четверг, 18 октябрь, 1973

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

1. Rosh Hashanah : пятница, 28 сентябрь, 1973
2. Yom Kippur : суббота, 6 октябрь, 1973