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How many working days in year 2052?
Here is the detail of the calculation:
Because 2052 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 2052.
 Here is the list of these 11 public holidays: 
 
 1. Año Nuevo : Monday, 1 January, 2052 
2. Jueves santo : Thursday, 18 April, 2052 
3. Viernes Santo : Friday, 19 April, 2052 
4. Lunes de Pascua : Monday, 22 April, 2052 
5. Fiesta del Trabajo : Wednesday, 1 May, 2052 
6. Santiago Apóstol : Thursday, 25 July, 2052 
7. Asuncíon de la Virgen : Thursday, 15 August, 2052 
8. Todos los Santos : Friday, 1 November, 2052 
9. Festividad de San Francisco Javier : Tuesday, 3 December, 2052 
10. Día de la Constitución Española : Friday, 6 December, 2052 
11. Día de Navidad : Wednesday, 25 December, 2052 
And here are the 3 public holidays falling on a weekend:
1. Epifanía del Señor : Saturday, 6 January, 2052 
2. Fiesta nacional de España : Saturday, 12 October, 2052 
3. Immaculada Concepcíon : Sunday, 8 December, 2052