Just out of curiousity.... My issue date is the 4th and my entry date is the 10th.... So do I have until the 4th to extend my tourist visa or the 10th? Also..... Does anyone know if Chiang Mai immigration will be open on Monday?

Your permission to stay expires on the date that is entered on the stamp that you received in your passport on the day that you entered Thailand. If you have a 60 day tourist visa, it's 60 days from that date. It will have the date admitted and the "until" date. The day you visa was issued doesn't mater, it's kust a ticket to enter, the date stamped in your passport is the controlling date.

Immigration is closed the 30th, 31st and 1st, reopens on the 2nd.

Edited December 27, 201312 yr by wayned

You have until the date stameped in your paspsort when you entered the country to extend.

CM-immigration is closed on Monday, they open Thursday the 2nd.