Define a period

...

How many working days in year 2012?

Here is the detail of the calculation:

Because 2012 is a leap year, it has 366 days.

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

Now, let's remove 4 public holidays that do not fall during a weekend and we obtain 257 working days in 2012.

Here is the list of these 4 public holidays:

1. Good Friday : Friday, 6 April, 2012
2. Labour Day : Tuesday, 1 May, 2012
3. National Day : Thursday, 9 August, 2012
4. Christmas Day : Tuesday, 25 December, 2012

And here is the public holiday falling on a weekend:

1. New Year's Day : Sunday, 1 January, 2012