Google Photos is overcompensating for the Daylight Saving Time switch on yesterday’s pictures. Photos taken at 6:00pm are labeled as 7:00pm. Everything from this summer/early fall (which might as well have been summer) is off, in the app anyway (the website shows the right time in PDT), which at least makes more sense than if it had only been one day. The weird thing: it’s not even showing the time in today’s timezone by mistake. It’s adjusting it the other way.
My best guess: There used to be a DST bug in Google Photos, but they adjusted for it. Now the bug’s been fixed, but the adjustment is still there.
Obligatory XKCD link: