MyEnglish - When writing "I am happy or I was happy" which is correct?

It might be worth starting with the present-tense version:
I am happy to be in Seoul > I am in London now, and I am happy that I am in Seoul.
I am happy to have been in Seoul during the Olympics > I may or may not be in Seoul now, but I am happy that I was there during the Olympics.

Putting these sentences into the past tense:
I was happy to be in Seoul > I was in London at the time I'm speaking about, and I was happy [then] that I was in Seoul.
I was happy to have been in Seoul during the Olympics > I may or may not have been in London at the time I'm speaking about, but I was happy [then] that I had been there

@Thank you
http://forum.wordreference.com/showthread.php?t=2493680