I'm not sure of the detail behind winsup/cygwin/localtime.cc, but there are problems with how Cygwin handles dates and times on Windows.
See http://www.cygwin.com/ml/cygwin/2003-07/msg01016.html.
If there is any relevance, I think it is imperative that the Win32 version of PostgreSQL links directly to the system clock and avoids this Cygwin bug.
Not the same problem.
cheers
andrew
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