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. Learn how to write a resignation letter with a notice period.I regretfully have to inform you that, after much thought, I have decided to resign and please accept this letter as a formal notice of my resignation. Learn how to write a 30day resignation letter. Read key tips for crafting a respectful notice for maintaining professional relationships.