problem with Dates

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It seems that you have load the "survival" package
date.mdy is a function from this one.
In this function the "origin" of the time is the first day of 1970
in the base package the origin is the first day of 1960
it's very curious...
Well, it would be very curious if they defined the same class, but the 
base package defines "Date" and the survival package defines "date". 
There's no reason why they should use the same origin, but it will cause 
problems if you mix them up.

 	-thomas
Benjamin Esterni
France

From: "Vegard Andersen" <vegard.andersen at ism.uit.no>
Subject: [R] Date conversion problem using "as.Date"
To: "r-help at lists.r-project.org" <r-help at stat.math.ethz.ch>
Message-ID: <opsntv38wtk0a1dr at petter-smart>
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charset=iso-8859-15

Hello!

My problem is that the Julian date "behind" my dates seems to be wrong. I
will examplify my problem.

t1 <- "1998-11-20"
t2 <- as.Date(t1)
# Here t2 is correctly "1998-11-20", but
date.mdy(t2)
$month
[1] 11
$day
[1] 19
$year
[1] 1988

And indeed, if I write: fix(t2) then I get : structure(10550, class =
"Date"). So the Julian date is 10550, which is "1988-11-19", not the
correct "1998-11-20"

If I instead of "as.Date" use "as.date", then things work ok. But I have
not found out how to instruct "as.date" to handle dates from the 21st
century.

I hope that someone can help me, thanks in advance!

-- 
Best regards,
Vegard Andersen
Institute of Community Medicine
University of Tromso
Tromso, Norway
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