What is the Chinese time zone in astrology?

This is a relative question: centered on GMT, Greenwich Meridian (right? ) East of the Eastern Hemisphere is +X hours; -x hours west. If China is the center and Greenwich Mean Time is 8 hours slower than China, it is -8.

Therefore, China time = GMT+8; GMT Time = China–8.

Like many constellation softwares, the default setting is -8, so you should fill -8 instead of 8~ in the empty column behind the "-"symbol.