check_timestamp (OpenID::Nonce)

    # File lib/openid/store/nonce.rb, line 37
        def Nonce.check_timestamp(nonce_str, allowed_skew=nil, now=nil)
          allowed_skew = skew if allowed_skew.nil?
          begin
            stamp, foo = split_nonce(nonce_str)
          rescue ArgumentError # bad timestamp
            return false
          end
          now = Time.now.to_i unless now

          # times before this are too old
          past = now - allowed_skew

          # times newer than this are too far in the future
          future = now + allowed_skew

          return (past <= stamp and stamp <= future)
        end