When I updated to iOS 11 on my iPhone SE some dates on SMSs in the Messages app had random future dates assigned to them.  I waited for the first update, iOS 11.0.1, which I installed a couple days ago, but it didn't fix the problem:

 

 

From the content of the messages, they look like they were probably from 2015 or 2016.  It's only 18 SMS "conversations," or about two screens to scroll down to reach the actual most recent SMS.  I have messages from as old as 2012 that seem to be properly indexed.   If I open one of the SMSs with a future date assigned, it shows only the day of week as if they were in the past week.  (Usually SMSs over a week old show day of week and date.)

 

I Googled and found no hits with a problem like mine, and not sure what best third-party site to use to get help.  I tried to get chat support from Apple, but keep getting the following error:

Has anybody here experienced such a problem with SMS dates, and more importantly, found a solution?

 

What's the best way to contact Apple for assistance from Thailand?

Try call them https://support.apple.com/en-in/HT201232

or wait as 11.1 Beta is out already.