Extend the Ruby Time object with a method that will find the next weekday.

time.rb

class Time
  class << self
    def next(day, from = nil)
      day = [:sunday,:monday,:tuesday,:wednesday,:thursday,:friday,:saturday].find_index(day) if day.class == Symbol
      one_day = 60 * 60 * 24
      original_date = from || now
      result = original_date
      result += one_day until result > original_date && result.wday == day 
      result
    end
  end
end

puts Time.now
puts Time.next(4) # thursday
puts Time.next(:tuesday) # tuesday