It is a known fact that a traveler must possess a valid Chinese visa to cover the whole period of their stay in Tibet. Tourists entering Tibet should be aware that Tibet Tourism Regulations do not allow any change in the departure date from Tibet. When you have submitted a particular date of departure after the tour, on the entry permit application, it cannot be altered. No visa extension will be allowed in Tibet for travelers under any circumstances. We recommend you to decide sensitively about all dates before we can apply for your Tibet Entry Permit. Sometimes, the Tourism Bureau may accidentally stamp a longer permit for you but that does not mean your visa has been extended. Just make sure that your Chinese visa covers the period of your Tibet tour prior to applying for Tibet Entry Permit.