There is a confirmed cross-platform glitch where the Guild timer does not match the system timers of the users. New posts are appearing "1 hour ago." Prior to this, one one system I had an issue where new posts were "In 1 minute." There is a desync somewhere.

EDIT: As it turns out, Microsoft is experiencing a problem where it broadcasts incorrect times to connected PCs and other devices. https://thenextweb.com/microsoft/2017/04/03/windows-time-service-wrong/