Define a period

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How many working days in year 1998?

Here is the detail of the calculation:

Because 1998 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 1998.

Here is the list of these 7 public holidays:

1. יום העצמאות : Thursday, 30 April, 1998
2. שבועות : Sunday, 31 May, 1998
3. ראש השנה : Monday, 21 September, 1998
4. ראש השנה : Tuesday, 22 September, 1998
5. יום כיפור : Wednesday, 30 September, 1998
6. סוכות : Monday, 5 October, 1998
7. שמחת תורה/שמיני עצרת : Monday, 12 October, 1998

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

1. פסח : Saturday, 11 April, 1998
2. שביעי של פסח : Friday, 17 April, 1998