Please be informed that a visa will be valid from the entry date to the exit date as printed on the visa approval letter. You can stay in Vietnam at any time between the entry date and the exit date. In other words, you can’t enter Vietnam before the entry date and you have to leave by the exit date.
As a result, we regret to inform you that you cannot enter Vietnam earlier than your granted arrival date in visa approval letter. You need to enter on exact day of arrival granted in your visa approval letter.
Please click here for Vietnam visa inquiry {itpsharepoint}