In the main section of your letter, mention your intended last working day. Be open and honest, I spoke face to face with my supervisor first.Then handed in a official letter. Ready to leave your current job? Here's how to write the perfect two week notice letter (without burning any bridges with your employer). Providing a two-week notice in writing is imperative, as official communications should be documented to serve as potential evidence if required. It's pretty standard to give your employer at least two weeks notice when you quit. There's no question that you CAN walk out tomorrow without giving notice at all, let alone 120days notice. Date: Specify the letter's date to document when the notice was given. How much notice (time) do you give when leaving a job for a new position?