Twice so far this has occurred (today and four-five days ago).
All of a sudden, the time is an hour earlier (3.11pm is displayed as 2.11pm on the computer). This causes issues for CrashPlan.
I go to Time & Date settings and it says +12 ahead of UTC (Auckland, NZ), adjust for day light saving automatically enabled.
Syncing with time.windows.com corrects the time back to 3.11pm.