Define a period

...

How many working days in year 1964?

Here is the detail of the calculation:

Because 1964 is a leap year, it has 366 days.

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

Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 252 working days in 1964.

Here is the list of these 10 public holidays:

1. New Year's Day : Wednesday, 1 January, 1964
2. Australia Day Observance : Monday, 27 January, 1964
3. Canberra Day : Monday, 9 March, 1964
4. Good Friday : Friday, 27 March, 1964
5. Easter Monday : Monday, 30 March, 1964
6. Anzac Day observance : Monday, 27 April, 1964
7. King's Birthday : Monday, 8 June, 1964
8. Labour Day : Monday, 5 October, 1964
9. Christmas Day : Friday, 25 December, 1964
10. Boxing Day Observance : Monday, 28 December, 1964

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

1. Australia Day : Sunday, 26 January, 1964
2. Easter Saturday : Saturday, 28 March, 1964
3. Easter Sunday : Sunday, 29 March, 1964
4. Anzac Day : Saturday, 25 April, 1964
5. Boxing Day : Saturday, 26 December, 1964