There are 25 hours today only in those places that use Daylight Savings Time. This excludes many parts of the world (including Saskatchewan, Canada). The international system is UTC (almost identical to GMT), which of course doesn't move an hour. It can be expected that Adsense uses this. For those in DST districts, you should now get back the hour that you lost in the Spring (when you had a day with 23 hours). I don't know that Adsense does this, but it would be very surprising if it didn't.
Being in the UK, midnight in google-land is 8am, so I'm normally on the comupter at that time if it's not a work day. I didn't think to be hanging around to see when the date actually changed, but I seem to recall that it had changed by mid morning, which would be consistent with them putting the clocks back at 2am google-time. I think we did get an extra hour of revenue.