Define a period

...

How many working days in year 1988?

Here is the detail of the calculation:

Because 1988 is a leap year, it has 366 days.

Let's remove 53 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1988.

Here is the list of these 10 public holidays:

1. New Year's Day : Friday, 1 January, 1988
2. Australia Day : Tuesday, 26 January, 1988
3. Canberra Day : Monday, 14 March, 1988
4. Good Friday : Friday, 1 April, 1988
5. Easter Monday : Monday, 4 April, 1988
6. Anzac Day : Monday, 25 April, 1988
7. King's Birthday : Monday, 13 June, 1988
8. Labour Day : Monday, 3 October, 1988
9. Christmas Day Observance : Monday, 26 December, 1988
10. Boxing Day Observance : Tuesday, 27 December, 1988

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

1. Easter Saturday : Saturday, 2 April, 1988
2. Easter Sunday : Sunday, 3 April, 1988
3. Christmas Day : Sunday, 25 December, 1988