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How many working days in year 2148?
Here is the detail of the calculation:
Because 2148 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 251 working days in 2148.
 Here is the list of these 11 public holidays: 
 
 1. Nyårsdagen : Monday, 1 January, 2148 
2. Långfredagen : Friday, 5 April, 2148 
3. Annandag påsk : Monday, 8 April, 2148 
4. Första maj : Wednesday, 1 May, 2148 
5. Kristi himmelsfärdsdag : Thursday, 16 May, 2148 
6. Nationaldagen : Thursday, 6 June, 2148 
7. Midsommarafton : Friday, 21 June, 2148 
8. Julafton : Tuesday, 24 December, 2148 
9. Juldagen : Wednesday, 25 December, 2148 
10. Annandag jul : Thursday, 26 December, 2148 
11. Nyårsafton : Tuesday, 31 December, 2148 
And here are the 5 public holidays falling on a weekend:
1. Trettondedag jul : Saturday, 6 January, 2148 
2. Påskdagen : Sunday, 7 April, 2148 
3. Pingstdagen : Sunday, 26 May, 2148 
4. Midsommardagen : Saturday, 22 June, 2148 
5. Alla helgons dag : Saturday, 2 November, 2148