Define a period

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How many working days in year 1973?

Here is the detail of the calculation:

Because 1973 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1973.

Here is the list of these 8 public holidays:

1. פורים : Sunday, 18 March, 1973
2. פסח : Tuesday, 17 April, 1973
3. שביעי של פסח : Monday, 23 April, 1973
4. יום העצמאות : Monday, 7 May, 1973
5. שבועות : Wednesday, 6 June, 1973
6. ראש השנה : Thursday, 27 September, 1973
7. סוכות : Thursday, 11 October, 1973
8. שמחת תורה/שמיני עצרת : Thursday, 18 October, 1973

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

1. ראש השנה : Friday, 28 September, 1973
2. יום כיפור : Saturday, 6 October, 1973