It works just like that - enter the initial date, enter the number of working days - the calculator will show the next working day.
Note 1:You can input negative days and calculator will count backwards.
Дни можно вводить отрицательные, и тогда калькулятор считает назад, соответственно
Note 3: Since the transfer of days holiday are regulated by special decree of the government, which usually comes in late October,calculator takes into account onlythe transfers for the 2008 - 2011 period.
Updates: Here is another calculator: Number of working days between two dates
Updates: 2011 is now supported