Start date for Non-O visa changed from Tourist Visa

[oztraveller]

When changing  from a tourist visa to a Non-O inside Thailand is the start date of the approved Non O from the date of application for the change or are the 90 days added on to the expiry date of the existing tourist visa?

[ubonjoe]

The 90 day entry starts on the date you do the application for the visa. They cancel out the 60 day entry when they stamp the 90 day entry.