I'd include the last day you can work. State your resignation.Provide the date of your last working day: In the same paragraph, provide the date of your last working day. You want to give at least a two weeks' notice. Please accept this letter as my formal resignation. Be sure to include your last date of work and briefly mention why you are resigning. Explicitly mention the final working day. Use our free letter of resignation template to make drafting your letters easy or fill in your details and we'll create the letter for you free of charge! Kamala Harris blasted the treatment of staff on the California Democrat's presidential campaign in a resignation letter this month. Of the United States, I would like to thank the people of California for the honor of serving them in the U.S. Senate over the past four years.