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How many working days in year 1945?

Here is the detail of the calculation:

Because 1945 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 5 public holidays that do not fall during a weekend and we obtain 256 working days in 1945.

Here is the list of these 5 public holidays:

1. Pesach : четверг, 29 март, 1945
2. Shvi'i shel Pesach : среда, 4 апрель, 1945
3. Yom Ha-Atzmaut : среда, 18 апрель, 1945
4. Rosh Hashanah : воскресенье, 9 сентябрь, 1945
5. Yom Kippur : понедельник, 17 сентябрь, 1945

And here are the 4 public holidays falling on a weekend:

1. Shavuot : пятница, 18 май, 1945
2. Rosh Hashanah : суббота, 8 сентябрь, 1945
3. Sukkot : суббота, 22 сентябрь, 1945
4. Shemini Atzeret / Simchat Torah : суббота, 29 сентябрь, 1945