How to calculate next, previous business day in Rails?

Question

How to calculate next and previous business days in Rails?

Answer 1

Here is a faster method that uses a simple calculation instead of iterating over the days.

class Time

  def shift_weekdays(num_weekdays)
    base = self

    # corner case: self falls on a Sat or Sun then treat like its the next Monday
    case self.wday
      when 0
        base = self + 1.day
      when 6
        base = self + 2.day
    end
    day_of_week = base.wday - 1 # Monday is 0

    weekends = (day_of_week + num_weekdays) / 5

    base + (weekends*2).days + num_weekdays.days
  end

end

The method is on class Time but can be used on Date class as well.