Re: [R] How long is a day?
On Wed, 2 Jul 2003, Laimonis Kavalieris wrote: Why is 19 March, 1947 a little longer than one day? A change from Daylight Savings Time in your time zone (unstated), according to your OS. Note, 0.04167 is exactly one hour, not `a little longer'. x - as.POSIXct(1947-04-16) julian(x, origin = as.POSIXct(1947-03-20)) Time difference of 27 days julian(x, origin = as.POSIXct(1947-03-19)) Time difference of 28.04167 days julian(x, origin = as.POSIXct(1947-03-18)) Time difference of 29.04167 days You can just subtract dates. In the UK x - as.POSIXct(1947-03-19) Time difference of 27.95833 days -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] How long is a day?
Why is 19 March, 1947 a little longer than one day? x - as.POSIXct(1947-04-16) julian(x, origin = as.POSIXct(1947-03-20)) Time difference of 27 days julian(x, origin = as.POSIXct(1947-03-19)) Time difference of 28.04167 days julian(x, origin = as.POSIXct(1947-03-18)) Time difference of 29.04167 days I am running R-1.7.1 compiled on RedHat 9.0 Laimonis -- Dr Laimonis Kavalieris Department of Mathematics and Statistics University of Otago PO Box 56 Dunedin New Zealand Tel (64)(3)479 7780 Fax (64)(3)479 8427 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] How long is a day?
Sorry about wasing time - Apparently NZ daylisght saving time finished on March 20, 1947 , and on March 3, 1980, and March 20, 2000 . I'm impressed that R knows all of this Laimonis -- Dr Laimonis Kavalieris Department of Mathematics and Statistics University of Otago PO Box 56 Dunedin New Zealand Tel (64)(3)479 7780 Fax (64)(3)479 8427 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
