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How many working days in year 2136?
Here is the detail of the calculation:
Because 2136 is a leap year, it has 366 days.
Let's remove 52 saturdays and 53 sundays. It remains 261 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2136.
 Here is the list of these 7 public holidays: 
 
 1. Easter Monday : Monday, 23 April, 2136 
2. Labor Day : Tuesday, 1 May, 2136 
3. Ascension Day : Thursday, 31 May, 2136 
4. Pentecost Monday : Monday, 11 June, 2136 
5. Assumption of Mary : Wednesday, 15 August, 2136 
6. All Saints' Day : Thursday, 1 November, 2136 
7. Christmas Day : Tuesday, 25 December, 2136 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : Sunday, 1 January, 2136 
2. National Day : Saturday, 21 July, 2136 
3. Armistice Day : Sunday, 11 November, 2136