The manual entry for as.POSIX says this about time zone codes...


Usage

as.POSIXct(x, tz = "")
tz
A timezone specification to be used for the conversion...

but it fails to mention what these "specifications" are.  So far, I  
have tried...

as.POSIX(x, tz="UTC")  ... works, gives UTC times
as.POSIX(x, tz="UTC")  ... works, gives EST times

as.POSIX(x, tz="CST")  ... does NOT work, gives UTC times

How do I get Central Standard Time or the US?  Anybody know what the  
code is?

Thanks.
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