Hi, I am working in an MNC company and currently serving my notice period. I am in a situation where my last working day is on 6th October, but my joining date in the new organization is 29th September (tomorrow). The new organization's HR is asking me to join on 29th September as there won't be an extension for the joining date. She mentioned that I should simultaneously work on the exit formalities from the previous company. After joining the new organization in this case, what should I do?