You must deal with identifying the time zone. I have found that setting TZ environment variable appropriately for the data before converting character values to POSIXct gives me the best results. This is actually easier for standard-time-only data than for data with daylight savings time transitions. For example I use
Sys.setenv(TZ="Etc/GMT+8") for year-round Standard time in California. The chron library offers an alternative approach that intentionally ignores time zones, but I have not found it so useful for my purposes as POSIXct. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. On February 6, 2014 1:30:22 PM PST, jcrosbie <ja...@crosb.ie> wrote: >This function returns date/times without timezone >strptime(dates,format="%d/%m/%Y %H:%M") > > > > > >-- >View this message in context: >http://r.789695.n4.nabble.com/why-is-as-date-function-not-working-for-me-dd-mm-yyyy-h-mm-tp4684874p4684895.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. ______________________________________________ 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.