Define a period

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How many working days in year 1983?

Here is the detail of the calculation:

Because 1983 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1983.

Here is the list of these 7 public holidays:

1. פסח : Tuesday, 29 March, 1983
2. שביעי של פסח : Monday, 4 April, 1983
3. יום העצמאות : Monday, 18 April, 1983
4. שבועות : Wednesday, 18 May, 1983
5. ראש השנה : Thursday, 8 September, 1983
6. סוכות : Thursday, 22 September, 1983
7. שמחת תורה/שמיני עצרת : Thursday, 29 September, 1983

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

1. ראש השנה : Friday, 9 September, 1983
2. יום כיפור : Saturday, 17 September, 1983