The start date and end date for DST was adjusted sometime in the decade of the 
2000s.  Again, this was done as an energy saving scheme.  I can't find the 
evidence of it at the moment but I recall another instance of the law of 
unintended consequences.  Apparently, (at least in the US) early in the new DST 
period, a fair number of people got home from work while it was quite light and 
used the opportunity to drive to a mall or place of entertainment.  As a result 
energy consumption actually went up in the first weeks.  (Again, this may be 
apocryphal.  Still, I found it a bit amusing.)

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