Define a period

...

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 9 public holidays that do not fall during a weekend and we obtain 253 working days in 2004.

Here is the list of these 9 public holidays:

1. Restoration Day of the Independent Czech State : Thursday, 1 January, 2004
2. Good Friday : Friday, 9 April, 2004
3. Easter Monday : Monday, 12 April, 2004
4. St Cyril and Methodius' Day : Monday, 5 July, 2004
5. Jan Hus Day : Tuesday, 6 July, 2004
6. St Wenceslas Day : Tuesday, 28 September, 2004
7. Independence Day : Thursday, 28 October, 2004
8. Freedom and Democracy Day : Wednesday, 17 November, 2004
9. Christmas Eve : Friday, 24 December, 2004

And here are the 4 public holidays falling on a weekend:

1. Labour Day : Saturday, 1 May, 2004
2. Liberation Day : Saturday, 8 May, 2004
3. Christmas Day : Saturday, 25 December, 2004
4. St. Stephen's Day : Sunday, 26 December, 2004