In short: don't leave the counter until the date on the stamp has been checked—the border guard can correct it immediately, using a pen and personal stamp. If you notice it later, the date on the stamp remains valid until it's officially corrected. Correction is sometimes possible at the immigration office, but the best option is to leave before the incorrect date. An overstay of up to 16 days in Vietnam costs VND0,5–2 million.
Border Guard Mistake at the Border Run: What to Do with an Incorrect Date on a Stamp
Introduction
A date stamp error is a common problem at Asian land borders. For a tourist, it might be a minor issue, but for an expat, an incorrect date can ruin their next border run and lead to an overstay fine. Lawyers and travelers on Reddit agree on one thing: the system uses the date entered into the database and stamped on the visa, not the one "supposed to be correct."
Rule #1: Check the stamp at the counter
The most painless way to resolve the issue: Don't leave the border guard until you check the "Must leave by/Until" date. If the guard makes a mistake, they can cross out the date with a pen right in front of you, write the correct one, and stamp it. It only takes a minute.
What to do if you've already left the border (Thailand and Vietnam)
If you notice a mistake at a hotel, you have two options:
Attempting to correct the stamp through immigration. In Thailand, there have been cases of successful stamp corrections at the main immigration office in Bangkok. You will need your passport, a copy of the stamped pages, and proof of entry (boarding pass or arrival card). In Vietnam, similar issues can sometimes be resolved at immigration offices at major airports (Hanoi, Ho Chi Minh City).
Rely on the stamp. Forums often report that local immigration offices (not the ones you entered through) refuse to correct mistakes made by their colleagues at the border.
Expat Solution: How to Avoid Overstays
If immigration doesn't help, there's only one safe way out: take a new border run before the date mistakenly indicated in your passport.
Waiting for the "correct" date (for example, 45 or 60 days) without checking the stamp is not an option: upon exit, you will be charged a fine for each day of overstay (in Thailand - 500 baht/day, in Vietnam - from 500 to 2 million dong), and if you overstay for a long time, you may be denied entry.
Summary
Correcting a mistake retroactively is difficult. Until the officer officially corrects the date in your passport, the date the border guard entered is considered your actual departure date.
