Just saw this in game:
"From 12:00 a.m. to 3:00 a.m. on Aug. 28 (PDT) / Aug. 28 8:00 to 11:00 (GMT)"
and on the loadstone:
"[Date & Time]
Aug. 28, 2013 from 08:00 to 11:00 (GMT)
* The completion time may be subject to change."
This is the second maintenance the times have been wrong so that's why I'm writing this now.
The time (right now) is 06:17 GMT, but the maintenance is starting in 45 minutes (same as last time, the 12am PDT time is right).
GMT never changes, the clocks don't go forwards/backwards. That time is showing BST/CET/IST or the annoyingly 4 letter WEST.