Hello all!!! I want to measure the duration of events (given a start and an end time). The catch is that I require the output in calender days. This means:
02-Jan-2011 00:01:00 minus 01-Jan-2011 23:59:00 should be 1 day (although the real time difference is only 2 minutes) My data is the following head(episode.ct) [1] "2009-07-13 13:37:20 CEST" "2009-07-14 07:29:20 CEST" "2009-07-14 07:51:20 CEST" "2009-07-14 08:45:20 CEST" [5] "2009-07-14 09:43:20 CEST" "2009-07-14 10:01:20 CEST" head(episode.end.ct) [1] "2009-07-13 13:47:20 CEST" "2009-07-14 07:49:20 CEST" "2009-07-14 08:01:20 CEST" "2009-07-14 08:53:20 CEST" [5] "2009-07-14 09:51:20 CEST" "2009-07-14 10:11:20 CEST" attributes(episode.ct) $class [1] "POSIXct" "POSIXt" $tzone [1] "" attributes(episode.end.ct) $class [1] "POSIXct" "POSIXt" $tzone [1] "" When I try : > difftime(episode.ct-episode.end.ct) I get Error in as.POSIXct.default(time1) : do not know how to convert 'time1' to class "POSIXct" Why is that? Is difftime what I need? Thank you very much JT -- View this message in context: http://r.789695.n4.nabble.com/Trouble-Time-Difference-with-difftime-tp3742847p3742847.html 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.
