Learn how to write a resignation letter with a notice period. Start with a two weeks notice letter.This will serve as a formal, written documentation of your intent to leave and your transition timeline. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Employee shall send a written notification to the supervisor at least 2 weeks in advance of resignation. 2. I am providing two weeks' notice. My last date of employment is (month, day, year). It has been more than 25 years since we started to work together.