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"
>
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