This is what I get: > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="GMT") + 0) [1] 0 attr(,"tzone") [1] "GMT" > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EST5EDT") + 0) [1] 18000 attr(,"tzone") [1] "EST5EDT" > R.version.string # Windows Vista [1] "R version 2.6.0 alpha (2007-09-06 r42791)"
so 1970-01-01 GMT is 0 and 1970-01-01 Eastern corresponds to a GMT of 18000. There is an article about dates and times in R News 4/1. On 9/11/07, yoooooo <[EMAIL PROTECTED]> wrote: > > Hi all, > > I tried to do this: > > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="") + 0) > [1] 18000 > > I thought the starting time is zero? Same result returns if I do: > > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EDT") + 0) > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EST") + 0) > unclass(strptime("1970-01-01", "%Y-%m-%d", tz="GMT") + 0) > > with LC_TIME=en_US; > > Or they always start from 18000? > > Thanks, > - yoooooo > > -- > View this message in context: > http://www.nabble.com/as.POSIXlt%2C-starting-at-0-or-18000--tf4422770.html#a12615136 > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > ______________________________________________ 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.