Ron Michael wrote: > When I use the code as.Date(0) the I get : "1970-01-01". My question is why > it is like that? help file on as.Date seems to give no light on that. Can > anyone clarify me? > Which version of R is this?
R version 2.7.1 (2008-06-23) ... > as.Date(0) Error in as.Date.numeric(0) : 'origin' must be supplied and the help page has the explanation. Internally, Date objects are represented as days since 1970-01-01, and you can still exploit that with > structure(0,class="Date") [1] "1970-01-01" although you really shouldn't need to have and shouldn't have to use that knowledge. [By the way, there used to be a way to see the current help pages on the web, but I can't remember how. Searching for as.Date via the R search sites doesn't help either (interesting set of sponsored links from Google though...), and the Wiki interface to help pages appears to be broken.] > > Regards, > > Send instant messages to your online friends http://uk.messenger.yahoo.com > [[alternative HTML version deleted]] > -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
