time_aprox_eql.rb

class Time
  def aprox_eql? (time2, interval)
    raise ArgumentError, 'Invalid Time object' unless time2.kind_of? Time
    raise ArgumentError, 'Invalid interval' unless [:year, :month, :mon, :day, :hour, :min, :sec, :usec].include? interval
    case interval
    when :year
      self.year == time2.year
    when :month, :mon
      self.year == time2.year and self.month == time2.month
    when :day
      self.year == time2.year and self.month == time2.month and self.day == time2.day
    when :hour
      self.year == time2.year and self.month == time2.month and self.day == time2.day and self.hour == time2.hour
    when :min
      self.year == time2.year and self.month == time2.month and self.day == time2.day and self.hour == time2.hour and self.min == time2.min
    when :sec
      self.year == time2.year and self.month == time2.month and self.day == time2.day and self.hour == time2.hour and self.min == time2.min and self.sec == time2.sec
    when :usec
      self == time2
    end
  end
end