On Jan 1, 2013, at 9:48 AM, "[email protected]" <[email protected]> 
wrote:

> It seems the updates started happening after 2am Eastern, on 2012-11-04,
...
>  I'm curious what changed on 2012-11-04.

End of day-light savings time in North America.  The mass check script has some 
logic that tries to identify DST, but I've never seen it make a difference in 
when my local copy ran, and it never bothered me enough to investigate. 

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