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How many working days in year 2051?
Here is the detail of the calculation:
Because 2051 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 14 public holidays that do not fall during a weekend and we obtain 246 working days in 2051.
 Here is the list of these 14 public holidays: 
 
 1. Epifanía del Señor : Friday, 6 January, 2051 
2. Jueves santo : Thursday, 30 March, 2051 
3. Viernes Santo : Friday, 31 March, 2051 
4. Fiesta del Trabajo : Monday, 1 May, 2051 
5. Fiesta de la Comunidad de Madrid : Tuesday, 2 May, 2051 
6. San Isidro Labrador : Monday, 15 May, 2051 
7. Santiago Apóstol : Tuesday, 25 July, 2051 
8. Asuncíon de la Virgen : Tuesday, 15 August, 2051 
9. Fiesta nacional de España : Thursday, 12 October, 2051 
10. Todos los Santos : Wednesday, 1 November, 2051 
11. Día de la Almudena : Thursday, 9 November, 2051 
12. Día de la Constitución Española : Wednesday, 6 December, 2051 
13. Immaculada Concepcíon : Friday, 8 December, 2051 
14. Día de Navidad : Monday, 25 December, 2051 
And here is the public holiday falling on a weekend:
1. Año Nuevo : Sunday, 1 January, 2051