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. פסח : Thursday, 9 April, 2009
2. שביעי של פסח : Wednesday, 15 April, 2009
3. יום העצמאות : Wednesday, 29 April, 2009
4. ראש השנה : Sunday, 20 September, 2009
5. יום כיפור : Monday, 28 September, 2009

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

1. שבועות : Friday, 29 May, 2009
2. ראש השנה : Saturday, 19 September, 2009
3. סוכות : Saturday, 3 October, 2009
4. שמחת תורה/שמיני עצרת : Saturday, 10 October, 2009