[R] problem with Dates

[Gabor Grothendieck]

Try this (and read R News 4/1):

Lines <- "6/4/1992 12:00:00 AM
2/13/1992 12:00:00 AM
6/19/1992 12:00:00 AM
2/11/1992 12:00:00 AM
6/22/1992 12:00:00 AM
10/3/1991 12:00:00 AM
5/12/1992 12:00:00 AM
7/11/1991 12:00:00 AM
2/6/1992 12:00:00 AM
10/4/1991 12:00:00 AM
1/31/1992 12:00:00 AM
6/9/1992 12:00:00 AM
10/9/1991 12:00:00 AM
6/10/1992 12:00:00 AM
7/19/1991 12:00:00 AM
7/18/1991 12:00:00 AM
9/20/1991 12:00:00 AM
8/6/1992 12:00:00 AM
8/12/1992 12:00:00 AM
8/19/1992 12:00:00 AM
7/12/1991 12:00:00 AM
6/5/1992 12:00:00 AM
2/7/1992 12:00:00 AM
7/1/1992 12:00:00 AM
8/7/1992 12:00:00 AM
8/13/1992 12:00:00 AM"

library(chron)
DF <- read.table(textConnection(Lines), as.is = TRUE)

# they are all dates so we don't need the time component
# Here we use chron class since that accepts
# mm/dd/yyyy format by default
dd <- as.chron(DF[[1]])
dd[1] - dd[2]
min(dd)

# or use Date class
DD <- as.Date(dd)
DD[1] - DD[2]
min(DD)

On Thu, Mar 19, 2009 at 2:20 AM, venkata kirankumar
<kiran4u2all at gmail.com> wrote:
> Hi all,
> I am strugling with date formates and caliculating diferent operations like
> different between 2 dates and
> getting minimum in vector of dates
>
> that is i m working with dates in formate         "6/22/1992  12:00:00 AM"
> and the vector is
>
> [1] 6/4/1992 12:00:00 AM     2/13/1992 12:00:00 AM    6/19/1992 12:00:00 AM
>  [4] 2/11/1992 12:00:00 AM  6/22/1992 12:00:00 AM    10/3/1991 12:00:00 AM
>  [7] 5/12/1992 12:00:00 AM  7/11/1991 12:00:00 AM    2/6/1992 12:00:00 AM
> [10] 10/4/1991 12:00:00 AM  1/31/1992 12:00:00 AM   6/9/1992 12:00:00 AM
> [13] 10/9/1991 12:00:00 AM  6/10/1992 12:00:00 AM    7/19/1991 12:00:00 AM
> [16] 7/18/1991 12:00:00 AM  9/20/1991 12:00:00 AM    8/6/1992 12:00:00 AM
> [19] 8/12/1992 12:00:00 AM  8/19/1992 12:00:00 AM    7/12/1991 12:00:00 AM
> [22] 6/5/1992 12:00:00 AM    2/7/1992 12:00:00 AM     7/1/1992 12:00:00 AM
> [25] 8/7/1992 12:00:00 AM    8/13/1992 12:00:00 AM
>
> and here i have to get least date (means first initial date) and i have to
> get difference between that date to all other dates in vector
>
> i tried with  functins like
>
> formate()
> and  round()    but its not woking on this formate of data
>
> can any one help me out to solve this
>
>
> thanks in advance
>
>        [[alternative HTML version deleted]]
>
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