Define a period

...

How many working days in year 2070?

Here is the detail of the calculation:

Because 2070 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 2070.

Here is the list of these 5 public holidays:

1. Pesach : Thursday, 27 March, 2070
2. Shvi'i shel Pesach : Wednesday, 2 April, 2070
3. Yom Ha-Atzmaut : Wednesday, 16 April, 2070
4. Rosh Hashanah : Sunday, 7 September, 2070
5. Yom Kippur : Monday, 15 September, 2070

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

1. Shavuot : Friday, 16 May, 2070
2. Rosh Hashanah : Saturday, 6 September, 2070
3. Sukkot : Saturday, 20 September, 2070
4. Shemini Atzeret / Simchat Torah : Saturday, 27 September, 2070