California's AtWill Employment Law Does Not Require 2 Weeks' Notice. California is an at-will employment state.No legal requirement in any state to provide 2 weeks' notice but it is a preferred business practice, a courtesy to the employer to help with any transition. By Brad Nakase, Attorney. There is no overriding legal rule requiring you give a two-week notice before quitting. It's customary to do so. In some cases, providing an employer a one week notice before resigning is ample warning, while in other positions two week's notice is standard.