For a model I am working on, I have samples organized by year and week of the year. For this model, the data (year and week) comes from the basic sample data, but I require a value representing the amount of time since the sample was taken (actually, for the purpose of the model, it is sufficient to use the number of weeks from the middle of the sample week to the present).
What I have found so far includes: library(Rmetrics) time1 = timeDate(charvec = Sys.Date(), format = "%Y-%m-%d", zone = "", FinCenter = "") time2 = timeDate("2004-08-30", format = "%Y-%m-%d", zone = "", FinCenter = "") difftimeDate(time1,time2,units = "weeks") Does timeDate use the format strings used by the UNIX date(1) command? If so, then can I safely assume timeDate will accept "%Y-%U-%w", and behave correctly? Thanks, Ted [[alternative HTML version deleted]] ______________________________________________ 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.