Newbie - Which Time Zone?

http://chinesepod.com/lessons/which-time-zone

A: 明天几点上课？
B: 早上八点。
A: 是北京时间吗？
B: 不是，是纽约时间。

A: Tomorrow, what time do we have class?
B: In the morning 8 o'clock.
A: Is that Beijing time?
B: It's not. It's New York time.