Yep, certs have valid from and to dates, not just expiry :)
Re:Gmail.. Of all Mailservers
by drethemadrapper on Monday July 13, 2015 @08:55AM
(#9877787)
Everything is fine with my infrastructure - network (active dir.) & PC time, e.t.c.. It might have in a different geographic area to the Google servers/CDNs though. One would never have expected this kind of weird error/notification with Google services. I am thinking many other users will be encountering such frustration.
If that is your _system_ time, then you need to set your system time properly.