I tend to avoid the issue by asking Oracle for a character string
representation of the date. I use sql like this:
to_char( thedatefield, 'yyyymmdd' ) as thedate
Then in R:
d <- as.Date( as.character( thedate, '%Y%m%d') )
Hope this helps,
Avram
------Original Message------
From: Ivan Alves
Sender: r-help-boun...@r-project.org
To: r-help@r-project.org
Sent: Dec 22, 2008 8:40 AM
Subject: [R] Treatment of Date ODBC objects in R (RODBC)
Dear all,
Retrieving an Oracle "Date" data type by means of RODBC (version
1.2-4) I get different classes in R depending on which operating
system I am in:
On MacOSX I get "Date" class
On Windows I get " "POSIXt" "POSIXct" class
The problem is material, as converting the "POSIXt" "POSIXct" object
with as.Date() returns one day less ("2008-12-17 00:00:00 CET" is
returned as "2008-12-16").
I have 2 related questions:
1. Is there a way to control the conversion used by RODBC for types
"Date"? or is this controlled by the ODBC Driver (in my case the
Oracle driver in Windows and Actual on Mac OS X)?
2. What is the trick to get as.Date() to return the _intended_ date
(the date that the OS X environment "correctly" reads)?
Many thanks in advance for any guidance.
Best regards,
Ivan
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