After 3 chats and 3 telephone calls, i finally got the issue resolved. The reason for so many attempts - chats and calls is because each Junior Advisor does not have the adequate knowledge and expertise to advise me correctly.
I requested to chat and speak with Senior Advisors and turns out that the CSO from M1 registered my AppleCare + for me on 18 September 2014. Therefore my expiration date is stated as 17 September 2014. This has been corrected in the system. I told the Senior Advisor the iPhone is not even launched on 18 September 2014.
This debunks all the funny reasons that the previous Junior Advisors gave to me. First one said the original date is correct because some months have 30 days and some months have 31 days. The second one say he will have to check but did not get back to me. The third one said it is tied to USA timezone. The fourth one said it is not tied to USA timezone. It is simply 365 days multiplied by 2 years.
Just glad to have my issue resolved after being able to communicate with a Senior Advisor from chat whom scheduled a call back for me and escalated the matter to a Senior Advisor from telephone support.