Define a period

...

How many working days in year 2021?

Here is the detail of the calculation:

Because 2021 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2021.

Here is the list of these 7 public holidays:

1. Нова Година : Friday, 1 January, 2021
2. Божић : Thursday, 7 January, 2021
3. Дан државности Србије : Monday, 15 February, 2021
4. Дан после Дана државности Србије : Tuesday, 16 February, 2021
5. Велики петак : Friday, 30 April, 2021
6. Васкршњи понедељак : Monday, 3 May, 2021
7. Дан примирја : Thursday, 11 November, 2021

And here are the 3 public holidays falling on a weekend:

1. Празник после Нове Године : Saturday, 2 January, 2021
2. Васкршња субота : Saturday, 1 May, 2021
3. Васкрс : Sunday, 2 May, 2021