Thank you but unlike my initial report, the real problem looks to be UNrelated with import process itself cause all date of threads started after import(even written today) are also fixed to July 11, 2010.
Strange things are:
1. Though all threads appear to be started on July 11, 2010, they are arranged correctly according to date value on thread view.
2. Date shown on tap of RecentNews of XenPorta correctly shows the date.
3. Date appears on Tapatalk correctly.
So I suspect any (cosmetic) disconnection between the variable showing date on forum and real date under that.
I think I'm approaching the answer. Please help! ;-)
This problem DOES NOT appear when I choose default English language. This problem ONLY appears when I turn on my CUSTOM Korean language set. I created Korean language using English as parent. I just changed some phrase, not touching any deep cut.