I'm in Thailand on an O-A visa which expires 06 January 2020 however the airport Immigration stamp says admitted until 20 January. I'm departing Thailand December 14 for an overseas trip and I want to take advantage of the extra year that is available when I return to Thailand in January 2020. Which date out of the two above do I have to take note of? I have a feeling it is the first one, 06 January?