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How many working days in year 1981?
Here is the detail of the calculation:
Because 1981 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 1981.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : четвер, 1 січень, 1981 
2. Good Friday : п'ятниця, 17 квітень, 1981 
3. Family Day : понеділок, 20 квітень, 1981 
4. Freedom Day : понеділок, 27 квітень, 1981 
5. Workers' Day : п'ятниця, 1 травень, 1981 
6. Youth Day : вівторок, 16 червень, 1981 
7. National Women's Day observance : понеділок, 10 серпень, 1981 
8. Heritage Day : четвер, 24 вересень, 1981 
9. Day of Reconciliation : середа, 16 грудень, 1981 
10. Christmas Day : п'ятниця, 25 грудень, 1981 
And here are the 3 public holidays falling on a weekend:
1. Human Rights Day : субота, 21 березень, 1981 
2. National Women's Day : неділя, 9 серпень, 1981 
3. Day of Goodwill : субота, 26 грудень, 1981