It is perfectly legal to ask an employee to sign a resignation letter at any time. They don't have to sign it.By Brad Nakase, Attorney. I am writing to give my resignation from (company name), effective (date), two weeks from today. This resignation was a difficult decision to make. California laws say that, in general, you are not required to give your employers two weeks notice – or any notice – prior to quitting or leaving a job. Here's information on company resignation policies, tips for accepting an employee's resignation, and examples of a resignation acceptance letter and email.