timezone irregularity when Windows TZ is set to Indiana

[Joseph Tate]

If I have a Windows PC with the timezone set to 
"(GMT-05:00)Indiana(East)", date +%Z returns the timezone as "USEST". 
Is this designed or broken behavior?

If I set TZ to USEST date returns a GMT time.  I've noticed that there 
is no zoneinfo package, but if I copy /usr/share/zoneinfo from a RHL 
system, and set the TZ env variable to 'America/Indianapolis' I get back 
EST as the timezone.

Where does the "USEST" come from?  Is that a Windows-ism or something in 
Cygwin?

I'm using cygwin 1.5.7-1 on Windows XP SP 1 with all updates supplied.

Joseph

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