State your resignation. I regret to inform you that, after much thought, I have decided to resign.Please accept this letter as a formal notice of my resignation. To eliminate any confusion, you can actually include the date of your last day. For example: "June 13th will be my last day." Please accept this letter as my formal resignation. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. How to write a great letter of resignation that will let you leave gracefully. You are contractually obligated to 2 months. So I would put that date in my resignation letter.