as.Date

Hello,

I find out which package disturbs as.Date(). It is the package Epi:

as.Date(36525, origin="1900-01-01")

[1] "2000-01-02"

library(Epi)
as.Date(36525, origin="1900-01-01")

[1] "2070-01-01"

detach("package:Epi")
as.Date(36525, origin="1900-01-01")

[1] "2000-01-02"

OK - that makes sense. Epi has its own as.Date.numeric function and
upon loading the package you get a warning:

library(Epi)

Attaching package: 'Epi'
The following object(s) are masked from 'package:base':
    as.Date.numeric, merge.data.frame


A quick look at the manual page confirms that Epi's version does not
have an origin option. 

cu
	Philipp

Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
Maximus-von-Imhof-Forum 3
85354 Freising, Germany
http://webclu.bio.wzw.tum.de/~pagel/