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How many working days in year 2144?
Here is the detail of the calculation:
Because 2144 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 17 public holidays that do not fall during a weekend and we obtain 245 working days in 2144.
 Here is the list of these 17 public holidays: 
 
 1. Año Nuevo : Wednesday, 1 January, 2144 
2. Día de los Reyes Magos : Monday, 6 January, 2144 
3. Día de San José : Monday, 23 March, 2144 
4. Jueves Santo : Thursday, 16 April, 2144 
5. Viernes Santo : Friday, 17 April, 2144 
6. Primero de Mayo : Friday, 1 May, 2144 
7. La Ascensión del Señor : Monday, 1 June, 2144 
8. Corpus Christi : Monday, 22 June, 2144 
9. El Sagrado Corazón de Jesús : Monday, 29 June, 2144 
10. Grito de Independencia : Monday, 20 July, 2144 
11. Batalla de Boyaca : Friday, 7 August, 2144 
12. La Asunción de la Virgen : Monday, 17 August, 2144 
13. Día de la Raza : Monday, 12 October, 2144 
14. Día de Todos los Santos : Monday, 2 November, 2144 
15. Independencia de Cartagena : Monday, 16 November, 2144 
16. Día de la Inmaculada Concepción : Tuesday, 8 December, 2144 
17. Navidad : Friday, 25 December, 2144 
And here is the public holiday falling on a weekend:
1. Domingo de Pascua : Sunday, 19 April, 2144