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How many working days in year 2020?
Here is the detail of the calculation:
Because 2020 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 254 working days in 2020.
 Here is the list of these 8 public holidays: 
 
 1. New Year's Day : Wednesday, 1 January, 2020 
2. Maundy Thursday : Thursday, 9 April, 2020 
3. Good Friday : Friday, 10 April, 2020 
4. Easter Monday : Monday, 13 April, 2020 
5. Labour Day : Friday, 1 May, 2020 
6. Ascension Day : Thursday, 21 May, 2020 
7. Whit Monday : Monday, 1 June, 2020 
8. Christmas Day : Friday, 25 December, 2020 
And here are the 4 public holidays falling on a weekend:
1. Easter Sunday : Sunday, 12 April, 2020 
2. Constitution Day : Sunday, 17 May, 2020 
3. Pentecost : Sunday, 31 May, 2020 
4. St Stephen's Day : Saturday, 26 December, 2020