I put the wrong arrival date on my e-visa. Will I be refused entry?

It depends which way the error goes. The e-visa is valid from the entry date on the visa to the exit date. You may enter on the start date or any day after it, until the visa ends. You cannot enter before the start date.

If you wrote the departure date from home, and you land a day later, you are fine, because you arrive after the start. If you land before the date on the visa, you will be refused boarding or entry.

Check your visa PDF against your flight itinerary, including the date you land after crossing time zones. A red-eye flight that lands the next morning counts as the next day.

If the start date is later than your arrival date, apply again with a correct date. You can apply for a new e-visa or use the urgent options if you fly soon. Read the details on evisa.gov.vn.