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How many working days in year 2143?

Here is the detail of the calculation:

Because 2143 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 2143.

Here is the list of these 8 public holidays:

1. Pesach : воскресенье, 31 март, 2143
2. Yom Ha-Atzmaut : четверг, 18 апрель, 2143
3. Shavuot : понедельник, 20 май, 2143
4. Rosh Hashanah : вторник, 10 сентябрь, 2143
5. Rosh Hashanah : среда, 11 сентябрь, 2143
6. Yom Kippur : четверг, 19 сентябрь, 2143
7. Sukkot : вторник, 24 сентябрь, 2143
8. Shemini Atzeret / Simchat Torah : вторник, 1 октябрь, 2143

And here is the public holiday falling on a weekend:

1. Shvi'i shel Pesach : суббота, 6 апрель, 2143