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, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help