Define a period

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How many working days in year 2105?

Here is the detail of the calculation:

Because 2105 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 11 public holidays that do not fall during a weekend and we obtain 250 working days in 2105.

Here is the list of these 11 public holidays:

1. New Year's Day : Thursday, 1 January, 2105
2. Australia Day : Monday, 26 January, 2105
3. Canberra Day : Monday, 9 March, 2105
4. Good Friday : Friday, 3 April, 2105
5. Easter Monday : Monday, 6 April, 2105
6. Anzac Day observance : Monday, 27 April, 2105
7. Reconciliation Day : Monday, 1 June, 2105
8. King's Birthday : Monday, 8 June, 2105
9. Labour Day : Monday, 5 October, 2105
10. Christmas Day : Friday, 25 December, 2105
11. Boxing Day Observance : Monday, 28 December, 2105

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

1. Easter Saturday : Saturday, 4 April, 2105
2. Easter Sunday : Sunday, 5 April, 2105
3. Anzac Day : Saturday, 25 April, 2105
4. Boxing Day : Saturday, 26 December, 2105