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How many working days in year 2139?

Here is the detail of the calculation:

Because 2139 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2139.

Here is the list of these 10 public holidays:

1. New Year's Day : четверг, 1 январь, 2139
2. St. Patrick's Day : вторник, 17 март, 2139
3. Good Friday : пятница, 17 апрель, 2139
4. Easter Monday : понедельник, 20 апрель, 2139
5. Early May Bank Holiday : понедельник, 4 май, 2139
6. Spring Bank Holiday : понедельник, 25 май, 2139
7. Orangemen's Day : понедельник, 13 июль, 2139
8. Late Summer Bank Holiday : понедельник, 31 август, 2139
9. Christmas Day : пятница, 25 декабрь, 2139
10. Boxing Day (substitute day) : понедельник, 28 декабрь, 2139

And here is the public holiday falling on a weekend:

1. Orangemen's Day : воскресенье, 12 июль, 2139