Learn how to write a professional job offer letter acceptance mail reply with joining date with an easy format and practical samples. Due to personal reasons, I need to request a change in my joining date.In this article, we show you how to write a joining date confirmation email to HR, explain why it is necessary and offer an email template and example. They consider some risk tolerance. When you accept an offer, you have two choices: Join the company, or give up. Can I start an application but complete it at a later date?