Define a period

...

How many working days in year 2020?

Here is the detail of the calculation:

Because 2020 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 251 working days in 2020.

Here is the list of these 11 public holidays:

1. New Year's Day : Wednesday, 1 January, 2020
2. Day after New Year's Day : Thursday, 2 January, 2020
3. Auckland Day : Monday, 27 January, 2020
4. Waitangi Day : Thursday, 6 February, 2020
5. Good Friday : Friday, 10 April, 2020
6. Easter Monday : Monday, 13 April, 2020
7. Anzac Day Observance : Monday, 27 April, 2020
8. Queen's Birthday : Monday, 1 June, 2020
9. Labour Day : Monday, 26 October, 2020
10. Christmas Day : Friday, 25 December, 2020
11. Boxing Day Observance : Monday, 28 December, 2020

And here are the 2 public holidays falling on a weekend:

1. Anzac Day : Saturday, 25 April, 2020
2. Boxing Day : Saturday, 26 December, 2020