Определить период

...

How many working days in year 1917?

Here is the detail of the calculation:

Because 1917 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 1917.

Here is the list of these 8 public holidays:

1. New Year's Day : понедельник, 1 январь, 1917
2. Republic Day : пятница, 26 январь, 1917
3. Maharaja Shivaji Jayanti : понедельник, 19 февраль, 1917
4. Good Friday : пятница, 6 апрель, 1917
5. Independence Day : среда, 15 август, 1917
6. Mahatma Gandhi's Birthday : вторник, 2 октябрь, 1917
7. Christmas Eve : понедельник, 24 декабрь, 1917
8. Christmas : вторник, 25 декабрь, 1917

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

1. Makar Sankranti : воскресенье, 14 январь, 1917
2. Mesadi : суббота, 14 апрель, 1917