What is the timezone that Facebook publish the scheduled posts?

What is the timezone that Facebook publish the scheduled posts?

References

Reference NO 1

http://www.postplanner.com/facebook-post-targeting-time-zones/

Reference NO 2

https://www.facebook.com/help/389849807718635/

Reference NO 3

http://stackoverflow.com/questions/13652913/what-is-the-timezone-that-facebook-publish-the-scheduled-posts

Reference NO 4

http://blog.hubspot.com/blog/tabid/6307/bid/33110/At-Last-Facebook-Allows-Pages-to-Schedule-Posts-Assign-Admin-Roles.aspx

Reference NO 5

http://harpsocial.com/2012/06/how-to-schedule-a-facebook-post/

Reference NO 6

http://socialmedia101.artizondigital.com/2012/06/how-to-schedule-facebook-posts-in-advance-from-your-page-timeline/

Reference NO 7

http://www.bloggingbistro.com/how-to-pre-schedule-status-updates-from-within-your-facebook-fan-page/

Reference NO 8

http://bloggingwithamy.com/how-to-schedule-facebook-page-updates-directly-in-facebook/