Can I enter Vietnam before or after the approved date?

The foreigners can enter Vietnam late couple of days after the approved day, but impossible to enter Vietnam before the entry date is applied.
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 3 months from the entry date was applied for.
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