Re: [Rd] as.Date: conversion pb from POSIXct (PR#9386)

2006-11-27 Thread ripley 
You have not told us your timezone, but this seems to be as documented if 
you are in CET.  The help page says

  The 'as.Date' methods accept character strings, factors, logical
  'NA' and objects of classes '"POSIXlt"' and '"POSIXct"'.  (The
  last are converted to days by ignoring the time after midnight in
  the representation of the time in UTC.)
 ^^

Probably as.POSIXct(strptime("1994-01-24","%Y-%m-%d") is 1994-01-23 23:00 
in UTC in your timezone.

On Mon, 27 Nov 2006, [EMAIL PROTECTED] wrote:

> Full_Name: Xiao Gang FAN
> Version: 2.4.0
> OS: Windows
> Submission from: (NULL) (159.50.101.9)
>
>
>> library(chron)

Irrelevant.

>> as.Date(as.POSIXct(strptime("1994-01-24","%Y-%m-%d")))
> [1] "1994-01-23"

Not in my timezone.

-- 
Brian D. Ripley,  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel:  +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax:  +44 1865 272595

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Re: [Rd] as.Date: conversion pb from POSIXct (PR#9386)

2006-11-27 Thread Gabor Grothendieck 
as.Date is converting your object with respect to GMT time zone and in
that time zone your POSIXct date is the day before.  See ?as.Date and also
suggest you read R News 4/1 help desk article.


On 11/27/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Full_Name: Xiao Gang FAN
> Version: 2.4.0
> OS: Windows
> Submission from: (NULL) (159.50.101.9)
>
>
> > library(chron)
> > as.Date(as.POSIXct(strptime("1994-01-24","%Y-%m-%d")))
> [1] "1994-01-23"
>
> __
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
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[Rd] as.Date: conversion pb from POSIXct (PR#9386)

2006-11-27 Thread xiao . gang . fan1 
Full_Name: Xiao Gang FAN
Version: 2.4.0
OS: Windows
Submission from: (NULL) (159.50.101.9)


> library(chron)
> as.Date(as.POSIXct(strptime("1994-01-24","%Y-%m-%d")))
[1] "1994-01-23"

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