COM dates (was origin and "origin<-" in chron)

I was just looking for an easy way to convert between COM datetime and chron
datetime (both ways.)

I found examples on the list, but they involved origin.



Does anyone have functions for converting COM datetime <-> chron
datetimethat work "safely"?



David L. Reiner

-----Original Message-----

From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com]

Sent: Tuesday, November 15, 2005 5:34 PM

To: David Reiner <davidr at rhotrading.com>

Cc: r-help at stat.math.ethz.ch

Subject: [SPAM] - Re: [R] origin and "origin<-" functions on chron -

Bayesian Filter detected spam

chron has a namespace so try this:

   chron:::origin

   getAnywhere("origin<-")

Having said that I would recommend that you don't use origins in chron.

The situation may have changed but when I wrote the Help Desk article

in R News 4/1 I encountered problems with using origins in some

situations and as discussed in the article its so easy to avoid using them

that there is really no good reason I can see not to avoid them.

On 11/15/05, davidr at rhotrading.com <davidr at rhotrading.com> wrote:

I'm trying to use/modify some code I found (at Omegahat, but I've seem

similar usage elsewhere.)

It contains the lines:

  if(any(origin(chronDate)!=orig))

     origin(chronDate) <- orig

Let's say:

require("chron")

[1] TRUE

chronDate <- chron("11/15/2005", format="m/d/y",

origin.=c(12,31,1899))

orig <- c(month=12, day=31, year=1899)

origin(chronDate)

Error: couldn't find function "origin"

origin(chronDate) <- orig

Error: couldn't find function "origin<-"

I'm sure I'm missing something simple here, but what? I've looked in the

archives and docs quite a lot....

Thanks for the help!

R-2.2.0 on Windows XP (SP2)

R.Version()

$platform

[1] "i386-pc-mingw32"

$arch

[1] "i386"

$os

[1] "mingw32"

$system

[1] "i386, mingw32"

$status

[1] ""

$major

[1] "2"

$minor

[1] "2.0"

$year

[1] "2005"

$month

[1] "10"

$day

[1] "06"

$"svn rev"

[1] "35749"

$language

[1] "R"

David L. Reiner

Rho Trading

440 S. LaSalle St.

Chicago IL 60605

312-362-4963

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