Format about Date and time
On Mar 14, 2009, at 8:52 AM, Aimin Yan 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$Date,"%m/%d/%Y"))
You do not have a %Y format for years. See if this minimal example helps:: timedf <- data.frame(Date1 = "12/20/08", Time1= "17:03:00") strptime( with(timedf, paste(Date1,Time1) ), format="%m/%d/%y %H:%M:%S") # [1] "2008-12-20 17:03:00"
ptime <- as.POSIXct(strptime(FormatedData$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?
David Winsemius, MD Heritage Laboratories West Hartford, CT