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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 246 public holidays that do not fall during a weekend and we obtain 246 working days in 2148.
 Here is the list of these 246 public holidays: 
 
 1. Año Nuevo : Monday, 1 January, 2148 
2. Día de los Reyes Magos : Monday, 8 January, 2148 
3. Día de San José : Monday, 25 March, 2148 
4. Jueves Santo : Thursday, 4 April, 2148 
5. Viernes Santo : Friday, 5 April, 2148 
6. Primero de Mayo : Wednesday, 1 May, 2148 
7. La Ascensión del Señor : Monday, 20 May, 2148 
8. Corpus Christi : Monday, 10 June, 2148 
9. El Sagrado Corazón de Jesús : Monday, 17 June, 2148 
10. San Pedro y San Pablo : Monday, 1 July, 2148 
11. Batalla de Boyaca : Wednesday, 7 August, 2148 
12. La Asunción de la Virgen : Monday, 19 August, 2148 
13. Día de la Raza : Monday, 14 October, 2148 
14. Día de Todos los Santos : Monday, 4 November, 2148 
15. Independencia de Cartagena : Monday, 11 November, 2148 
16. Navidad : Wednesday, 25 December, 2148 
And here are the 3 public holidays falling on a weekend:
1. Domingo de Pascua : Sunday, 7 April, 2148 
2. Grito de Independencia : Saturday, 20 July, 2148 
3. Día de la Inmaculada Concepción : Sunday, 8 December, 2148