[R] "XLConnect" packages; Excel dates read incorrectly

[Eric Berger]

Jim,
I don't see how that link could be related to John's issue. Symptoms
related to your link involve discrepancies of four years whereas John is
seeing discrepancies of one day.

John,
I do not see any attached files.

Regards

On Sat, Sep 23, 2017 at 1:30 PM, Jim Lemon <drjimlemon at gmail.com> wrote:

> Hi John,
> It could be due to this:
>
> https://support.microsoft.com/en-au/help/214330/differences-
> between-the-1900-and-the-1904-date-system-in-excel
>
> Jim
>
>
> On Sat, Sep 23, 2017 at 1:04 PM, John <miaojpm at gmail.com> wrote:
> > Hi,
> >
> >    I tried to read xlsx files by "XLConnect" packages, but the dates are
> > one day earlier than it is supposed to be. I moved from California to
> > Taiwan (Eastern Asia), and it worked well in California, but not in
> Taiwan.
> > Even if I adjust my Mac time to California time zone, it gives the wrong
> > dates. I don't know which part of the setting (in RStudio or in my Mac?)
> I
> > should adjust. The codes and the data are attached.
> >
> >    My data are on weekdays, Monday to Friday every week, but they are
> read
> > as Sunday to Thursday.
> >
> > Data:
> > 2004-01-01 (Th)
> > 2004-01-02 (F)
> > 2004-01-05 (M)
> > 2004-01-06 (T)
> > 2004-01-07 (W)
> > 2004-01-08 (Th)
> > 2004-01-09 (F)
> >
> > The data are read as:
> > "2003-12-31" (W)
> > "2004-01-01" (Th)
> > "2004-01-04" (Su)
> > "2004-01-05" (M)
> > "2004-01-06" (Tu)
> > "2004-01-07" (W)
> >  "2004-01-08" (Th)
> >
> >
> >
> > The codes are (also attached):
> >
> >
> > rm(list=ls())
> > library(XLConnect)
> > library(xlsx)
> >
> > fl<-paste("allData_out3.xlsx")
> > a1<-readWorksheetFromFile(fl, sheet="first", colTypes="numeric")
> > b1<-readWorksheetFromFile(fl, sheet="second", colTypes="numeric")
> > a_col<-readWorksheetFromFile(fl, sheet="first")
> > date11<-as.Date(a_col$date, format="%Y-%m-%d")
> >
> >
> > The output:
> >> date11
> >  [1] "2003-12-31" "2004-01-01" "2004-01-04" "2004-01-05" "2004-01-06"
> > "2004-01-07"
> >  [7] "2004-01-08" "2004-01-11" "2004-01-12" "2004-01-13" "2004-01-14"
> > "2004-01-15"
> > [13] "2004-01-18" "2004-01-19" "2004-01-20" "2004-01-21" "2004-01-22"
> > "2004-01-25"
> > [19] "2004-01-26" "2004-01-27" "2004-01-28" "2004-01-29" "2004-02-01"
> >>
> >
> >
> > Thanks!!
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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