Yes, it is possible to request an earlier effective resignation date with a penalty. To do so, you can submit a written request to your HR department explaining your reasons for wanting to leave a week earlier than originally stated. You should mention that you understand there may be a penalty involved for breaking the one month notice period. It would be advisable to mention the specific date you would like your last day to be, which in this case, is December 18th. By providing this information, you can initiate a discussion with your employer regarding the possibility of an early release from your employment. However, it is important to keep in mind that the final decision ultimately rests with your employer. It would be best to consult with your HR department or supervisor to understand the company's policy on early resignations and any potential penalties that may apply. They will be able to provide you with the necessary guidance and instructions to proceed with your request.