Format about Date and time
library(chron) Lines <- " ID Target Actual Date Time 1 2030 0 -57.0 12/20/08 17:03:00 2 2030 90 90.0 12/20/08 18:41:00 3 2030 45 43.8 12/21/08 14:36:00 4 2030 0 -23.8 12/21/08 19:30:00 5 2030 90 90.2 12/21/08 21:48:00 6 2030 45 48.6 12/22/08 13:02:00" DF <- read.table(textConnection(Lines), header = TRUE, as.is = TRUE) dt <- chron(DF$Date, DF$Time) DF$pdate <- format(as.Date(dt)) DF$ptime <- format(dt - dates(dt)) This gives:
DF
ID Target Actual Date Time pdate ptime 1 2030 0 -57.0 12/20/08 17:03:00 2008-12-20 17:03:00 2 2030 90 90.0 12/20/08 18:41:00 2008-12-20 18:41:00 3 2030 45 43.8 12/21/08 14:36:00 2008-12-21 14:36:00 4 2030 0 -23.8 12/21/08 19:30:00 2008-12-21 19:30:00 5 2030 90 90.2 12/21/08 21:48:00 2008-12-21 21:48:00 6 2030 45 48.6 12/22/08 13:02:00 2008-12-22 13:02:00 See R News 4/1 for info on dates. Also, why do you want to store formatted dates in the first place?
On Sat, Mar 14, 2009 at 8:52 AM, Aimin Yan <aiminy at iastate.edu> wrote:
I have a data set like this:
head(FormatedData)
? ?ID Target Actual ? ? Date ? ? Time 1 2030 ? ? ?0 ?-57.0 12/20/08 17:03:00 2 2030 ? ? 90 ? 90.0 12/20/08 18:41:00 3 2030 ? ? 45 ? 43.8 12/21/08 14:36:00 4 2030 ? ? ?0 ?-23.8 12/21/08 19:30:00 5 2030 ? ? 90 ? 90.2 12/21/08 21:48:00 6 2030 ? ? 45 ? 48.6 12/22/08 13:02:00 I wan to convert the format of Date and Time, so I did this: pdate <- as.POSIXct(strptime(FormatedData$Date,"%m/%d/%Y")) ptime <- as.POSIXct(strptime(FormatedData$Time,"%H:%M:%S")) but I get the following format:
head(NewFormatedData)
? ?ID Target Actual ? ? Date ? ? Time ? pdate ? ? ? ? ? ? ? ptime 1 2030 ? ? ?0 ?-57.0 12/20/08 17:03:00 8-12-20 2009-03-14 17:03:00 2 2030 ? ? 90 ? 90.0 12/20/08 18:41:00 8-12-20 2009-03-14 18:41:00 3 2030 ? ? 45 ? 43.8 12/21/08 14:36:00 8-12-21 2009-03-14 14:36:00 4 2030 ? ? ?0 ?-23.8 12/21/08 19:30:00 8-12-21 2009-03-14 19:30:00 5 2030 ? ? 90 ? 90.2 12/21/08 21:48:00 8-12-21 2009-03-14 21:48:00 6 2030 ? ? 45 ? 48.6 12/22/08 13:02:00 8-12-22 2009-03-14 13:02:00 in ptime, it includes the current date, I don't want this, actually, I want to have the following formats: ? ?ID Target Actual ? ? Date ? ? Time ? ?pdate ? ? ? ? ? ? ? ptime 1 2030 ? ? ?0 ?-57.0 12/20/08 17:03:00 ?2008-12-20 ? ? ?17:03:00 2 2030 ? ? 90 ? 90.0 12/20/08 18:41:00 2008-12-20 ? ? ?18:41:00 3 2030 ? ? 45 ? 43.8 12/21/08 14:36:00 ?2008-12-21 ? ? 14:36:00 4 2030 ? ? ?0 ?-23.8 12/21/08 19:30:00 ? 2008-12-21 ? ? 19:30:00 5 2030 ? ? 90 ? 90.2 12/21/08 21:48:00 ?2008-12-21 ? ? ?21:48:00 6 2030 ? ? 45 ? 48.6 12/22/08 13:02:00 ?2008-12-22 ? ? 13:02:00 Does anyone know how to do these?
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