Define a period

...

How many working days in year 1983?

Here is the detail of the calculation:

Because 1983 is not a leap year, it has 365 days.

Let's remove 53 saturdays and 52 sundays. It remains 260 days.

Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1983.

Here is the list of these 7 public holidays:

1. Божић : Friday, 7 January, 1983
2. Дан државности Србије : Tuesday, 15 February, 1983
3. Дан после Дана државности Србије : Wednesday, 16 February, 1983
4. Празник после Празника рада : Monday, 2 May, 1983
5. Велики петак : Friday, 6 May, 1983
6. Васкршњи понедељак : Monday, 9 May, 1983
7. Дан примирја : Friday, 11 November, 1983

And here are the 5 public holidays falling on a weekend:

1. Нова Година : Saturday, 1 January, 1983
2. Празник после Нове Године : Sunday, 2 January, 1983
3. Празник рада : Sunday, 1 May, 1983
4. Васкршња субота : Saturday, 7 May, 1983
5. Васкрс : Sunday, 8 May, 1983