Message-ID: <971536df0903140932v7e3b99d4raba2efd7c560c5a6@mail.gmail.com>
Date: 2009-03-14T16:32:07Z
From: Gabor Grothendieck
Subject: Format about Date and time
In-Reply-To: <200903141252.n2ECqSGP022360@despam-10.iastate.edu>
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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