Notice my last activity, as well as the times on the New Posts page, but then look at my computer clock at the bottom right. It's still November 2, but XenForo is thinking it's already November 3 for Pacific time users. Things from today should still be saying today, not yesterday, and things from yesterday should still be saying yesterday, not Saturday.
Edit: However, current times still appear correct. If I hover over "X minutes ago" on this post, it properly displays "Nov 2, 2014 at 11:25 PM."