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How many working days in year 1980?

Here is the detail of the calculation:

Because 1980 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 253 working days in 1980.

Here is the list of these 9 public holidays:

1. New Year's Day : вторник, 1 январь, 1980
2. St. Patrick's Day : понедельник, 17 март, 1980
3. Easter Monday : понедельник, 7 апрель, 1980
4. Early May Bank Holiday : понедельник, 5 май, 1980
5. June Bank Holiday : понедельник, 2 июнь, 1980
6. Summer Bank Holiday : понедельник, 4 август, 1980
7. October Bank Holiday : понедельник, 27 октябрь, 1980
8. Christmas Day : четверг, 25 декабрь, 1980
9. St. Stephen's Day : пятница, 26 декабрь, 1980