module Tins::TimeDummy

def self.included(modul)
  class << modul
    alias really_new new
    alias really_now now
    remove_method :now rescue nil
    remove_method :new rescue nil
    def dummy=(value)
      if value.respond_to?(:to_str)
        value = Time.parse(value.to_str)
      elsif value.respond_to?(:to_time)
        value = value.to_time
      end
      @dummy = value
    end
    def dummy(value = nil)
      if value.nil?
        if defined?(@dummy)
          @dummy
        end
      else
        begin
          old_dummy = @dummy
          self.dummy = value
          yield
        ensure
          self.dummy = old_dummy
        end
      end
    end
    def new(*a)
      if dummy
        dummy.dup
      elsif caller.first =~ /`now`/
        really_now
      else
        really_new(*a)
      end
    end
    def now
      new
    end
  end
  super
end