Okay, hold it! Yes, it will "always" be 9 o'clock when DocJohn has his chat but his 9 o'clock next week WAS 10 o'clock this week.

It is 9:23 in Boston now.

It is 6:23 in Tucson, according to the world clock http://www.timeanddate.com/worldclock/full.html

Tomorrow, if DocJohn were to wait until "now" to turn back his clock, it would be 10:23 when he turned it back to 9:23. So, he's not going to get any "closer" to you. If he were to decide at 9:23 tomorrow to change his clock, he would change it to read 8:23 and he'd have to wait 37 more minutes to start a 9:00 chat. So, next week at 10:00 in DocJohn unchanged timezone it will be 9:00 in "new" Boston time and 6:00 in Tucson :-)