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How many working days in year 1977?

Here is the detail of the calculation:

Because 1977 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 8 public holidays that do not fall during a weekend and we obtain 252 working days in 1977.

Here is the list of these 8 public holidays:

1. Pesach : воскресенье, 3 апрель, 1977
2. Yom Ha-Atzmaut : четверг, 21 апрель, 1977
3. Shavuot : понедельник, 23 май, 1977
4. Rosh Hashanah : вторник, 13 сентябрь, 1977
5. Rosh Hashanah : среда, 14 сентябрь, 1977
6. Yom Kippur : четверг, 22 сентябрь, 1977
7. Sukkot : вторник, 27 сентябрь, 1977
8. Shemini Atzeret / Simchat Torah : вторник, 4 октябрь, 1977

And here is the public holiday falling on a weekend:

1. Shvi'i shel Pesach : суббота, 9 апрель, 1977