Define a period

...

How many working days in year 1988?

Here is the detail of the calculation:

Because 1988 is a leap year, it has 366 days.

Let's remove 53 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 1988.

Here is the list of these 10 public holidays:

1. New Year's Day : Friday, 1 January, 1988
2. Epiphany : Wednesday, 6 January, 1988
3. Clean Monday : Monday, 22 February, 1988
4. Independence Day : Friday, 25 March, 1988
5. Good Friday : Friday, 8 April, 1988
6. Easter Monday : Monday, 11 April, 1988
7. Pentecost Monday : Monday, 30 May, 1988
8. Assumption : Monday, 15 August, 1988
9. Ochi Day : Friday, 28 October, 1988
10. Glorifying Mother of God : Monday, 26 December, 1988

And here are the 4 public holidays falling on a weekend:

1. Orthodox Easter : Sunday, 10 April, 1988
2. Labour Day : Sunday, 1 May, 1988
3. Pentecost : Sunday, 29 May, 1988
4. Christmas : Sunday, 25 December, 1988