How many working days in year 1944?
Here is the detail of the calculation:
Because 1944 is a leap year, it has 366 days.
Let's remove 53 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1944.
 Here is the list of these 9 public holidays: 
 
 1. Maundy Thursday : четверг, 6 апрель, 1944 
2. Good Friday : пятница, 7 апрель, 1944 
3. Easter Monday : понедельник, 10 апрель, 1944 
4. Labour Day : понедельник, 1 май, 1944 
5. Constitution Day : среда, 17 май, 1944 
6. Ascension Day : четверг, 18 май, 1944 
7. Whit Monday : понедельник, 29 май, 1944 
8. Christmas Day : понедельник, 25 декабрь, 1944 
9. St Stephen's Day : вторник, 26 декабрь, 1944 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : суббота, 1 январь, 1944 
2. Easter Sunday : воскресенье, 9 апрель, 1944 
3. Pentecost : воскресенье, 28 май, 1944