I know dates can be changed without a fee. Does that include the departure date? I'm getting ready to purchase a *A RTW starting mid June 2025. I should know before the end of this year if I will need to leave 1-2 weeks earlier. It would not affect the subsequent dates as my 1st stop is to visit family. I thought I had read somewhere that dates can be changed "except" the departure date. Maybe I imagined this as I can't find this anywhere. I just want to be sure before I finalize my booking. Thank you in advance!