I have a 90 Visa based on marriage my extension ends on January 31 if I go in early to apply for the new Ext will they start the new Ext on the day the old one expires or will they start the extension from the day they approve the extension. I live in Phichit Province
TLDR : Answer Summary
The extension for your 90-day visa, based on marriage, will start the day your current visa expires, January 31, as long as you provide the same paperwork required for your previous extension. It's important to apply before the expiration date and include new photos.