Define a period

...

How many working days in year 2015?

Here is the detail of the calculation:

Because 2015 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2015.

Here is the list of these 7 public holidays:

1. יום העצמאות : Thursday, 23 April, 2015
2. שבועות : Sunday, 24 May, 2015
3. ראש השנה : Monday, 14 September, 2015
4. ראש השנה : Tuesday, 15 September, 2015
5. יום כיפור : Wednesday, 23 September, 2015
6. סוכות : Monday, 28 September, 2015
7. שמחת תורה/שמיני עצרת : Monday, 5 October, 2015

And here are the 2 public holidays falling on a weekend:

1. פסח : Saturday, 4 April, 2015
2. שביעי של פסח : Friday, 10 April, 2015