Ja, 14:00 är det nog..

" Daily Ban on Sale of Alcohol, Elections, and Religious Holidays
The sale of alcohol in Thailand is banned between 2pm and 5pm and again between midnight and 11am seven days a week. This rule largely affects supermarkets and chain shops, such as 7-11 or Tops. It is common knowledge that the law is not always enforced at smaller, family-run shops."

http://www.thailawforum.com/tourst-guide-laws-Thailand.html