I think he's on Sydney/Melbourne time as he is always posting two or three hours ahead of me (Singapore/KL time) (or three or four hours ahead of Thai time). By the time I get up at around 6 AM, I noticed that he would have already made a few posts two or three hours earlier (two or three depending on Daylight Savings). And he rarely posts past midnight Singapore time (11 PM Thai time) as he would have gone to bed two or three hours earlier.