In this article, we discuss how to create a 30day resignation letter, why it's important and provide a template and examples to help you write your own. Looking to resign with a One Month Notice Resignation Letter?Use our resignation letter template for notice-period roles. The format of your resignation with a notice period should be a letter. Learn how to write a 30day resignation letter. Read key tips for crafting a respectful notice for maintaining professional relationships. Within one work day, provide a copy of the constructive resignation letter to the employee's union, as authorized. 23.3 Effective Resignation. Looking to resign with a 30 Day Notice Resignation Letter? Employment lists for a period not to exceed one (1) calendar month.