The foreigners passport  holder who already have Vietnam visa approval letter or even visa stamp on their passports. They can enter Vietnam a few days after its show on. But they are not allowed to Vietnam before the date given above.

The visa is valid automatically for 1 month from the entry date you applied. In case you requested one-month visa, you can leave Vietnam whenever you want within one month. Similarly, the foreigner can exit Vietnam any time within 03/06 months from the entry date was applied for 03/06 months Vietnam visa.