Define a period

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How many working days in year 2009?

Here is the detail of the calculation:

Because 2009 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 5 public holidays that do not fall during a weekend and we obtain 256 working days in 2009.

Here is the list of these 5 public holidays:

1. New Year's Day : Thursday, 1 January, 2009
2. Good Friday : Friday, 10 April, 2009
3. Labour Day : Friday, 1 May, 2009
4. National Day : Monday, 10 August, 2009
5. Christmas Day : Friday, 25 December, 2009

And here is the public holiday falling on a weekend:

1. National Day : Sunday, 9 August, 2009