Try to not blindly copy&paste scripts
The script here
http://forum.mikrotik.com/t/convert-month-to-number-on-date-not-typical/162344/2
{
:local M ([:find "xxanebarprayunulugepctovecANEBARPRAYUNULUGEPCTOVEC" "ov" -1] / 2); :if ($M>12) do={:set M ($M - 12)}
:put $M
}
is obviously one example for november,