Confusion of Time Zones

Word Press has a different idea of time zones than I normally see.  On the Windows clock in the time zones tab it says "(GMT-08:00) Pacific Time (US & Canada)" but in Word Press my time zone is ULC -7.  I don't know why but I thought we were in +8 which is china lol.  It took me a bit to figure that out and I had to change all the dates and times of my previous posts to reflect the actual time that I posted them.  When I went to make a new post it said today was September 17th and I know it's the 16th so I was a bit confused lol.  Also it was off by many hours too heh.  Oh well, it's all fixed.  Now my task is to finish getting as many of my old blogs archived here.