Define a period

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How many working days in year 2004?

Here is the detail of the calculation:

Because 2004 is a leap year, it has 366 days.

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

Now, let's remove 5 public holidays that do not fall during a weekend and we obtain 257 working days in 2004.

Here is the list of these 5 public holidays:

1. Новы год : Thursday, 1 January, 2004
2. Новы год : Friday, 2 January, 2004
3. Каляды праваслаўныя : Wednesday, 7 January, 2004
4. Мiжнародны жаночы дзень : Monday, 8 March, 2004
5. Радунiца : Tuesday, 20 April, 2004

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

1. Дзень працы : Saturday, 1 May, 2004
2. Дзень Перамогi : Sunday, 9 May, 2004
3. Дзень Незалежнасцi : Saturday, 3 July, 2004
4. Дзень Кастрычніцкай рэвалюцыі : Sunday, 7 November, 2004
5. Каляды каталiцкiя : Saturday, 25 December, 2004