R help - Sep 2007 - handle dates in R?

Dear Rusers,
  I have some data in .csv file like "2004-8-1" and
"2004-10-1", and i  need
to convert them into days from the origin (January 1, 1960).
I have tried the function date.mmddyyyy(), but cannot get it. Anybody can
show me how to handle the date data?
  Thanks very much!

My dataset like:
time
2004-8-1
2004-10-1
2001-9-1
2002-9-1


-- 
With Kind Regards,

oooO:::::::::
(..):::::::::
:\.(:::Oooo::
::\_)::(..)::
:::::::)./:::
::::::(_/::::
:::::::::::::
[***********************************************************************]
Zhi Jie,Zhang ,PHD
Tel:86-21-54237149
Dept. of Epidemiology,School of Public Health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
Email:epistat@gmail.com
Website: www.statABC.com
[***********************************************************************]
oooO:::::::::
(..):::::::::
:\.(:::Oooo::
::\_)::(..)::
:::::::)./:::
::::::(_/::::
:::::::::::::

	[[alternative HTML version deleted]]

Take a look at the "chron" package...
> as.chron("2004-8-1",format=c(dates="y-m-d")) -
as.chron("1960-1-1",format=c(dates="y-m-d"))
Time in days:
[1] 16284


On 9/13/07, zhijie zhang <epistat@gmail.com>
wrote:
>
> Dear Rusers,
>   I have some data in .csv file like "2004-8-1" and
"2004-10-1", and
> i  need
> to convert them into days from the origin (January 1, 1960).
> I have tried the function date.mmddyyyy(), but cannot get it. Anybody can
> show me how to handle the date data?
>   Thanks very much!
>
> My dataset like:
> time
> 2004-8-1
> 2004-10-1
> 2001-9-1
> 2002-9-1
>
>
> --
> With Kind Regards,
>
> oooO:::::::::
> (..):::::::::
> :\.(:::Oooo::
> ::\_)::(..)::
> :::::::)./:::
> ::::::(_/::::
> :::::::::::::
> [***********************************************************************]
> Zhi Jie,Zhang ,PHD
> Tel:86-21-54237149
> Dept. of Epidemiology,School of Public Health,Fudan University
> Address:No. 138 Yi Xue Yuan Road,Shanghai,China
> Postcode:200032
> Email:epistat@gmail.com
> Website: www.statABC.com
> [***********************************************************************]
> oooO:::::::::
> (..):::::::::
> :\.(:::Oooo::
> ::\_)::(..)::
> :::::::)./:::
> ::::::(_/::::
> :::::::::::::
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
>
	[[alternative HTML version deleted]]

dts <- c("2004-8-1","2004-10-1","2001-9-1")
strptime(dts,"%Y-%m-%d")
julian(strptime(dts,"%Y-%m-%d")) 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of zhijie zhang
> Sent: Thursday, September 13, 2007 8:19 AM
> To: R-help at stat.math.ethz.ch
> Subject: [R] handle dates in R?
> 
> Dear Rusers,
>   I have some data in .csv file like "2004-8-1" and 
> "2004-10-1", and i  need to convert them into days from the 
> origin (January 1, 1960).
> I have tried the function date.mmddyyyy(), but cannot get it. 
> Anybody can show me how to handle the date data?
>   Thanks very much!
> 
> My dataset like:
> time
> 2004-8-1
> 2004-10-1
> 2001-9-1
> 2002-9-1
> 
> 
> --
> With Kind Regards,
> 
> oooO:::::::::
> (..):::::::::
> :\.(:::Oooo::
> ::\_)::(..)::
> :::::::)./:::
> ::::::(_/::::
> :::::::::::::
> [*************************************************************
> **********]
> Zhi Jie,Zhang ,PHD
> Tel:86-21-54237149
> Dept. of Epidemiology,School of Public Health,Fudan 
> University Address:No. 138 Yi Xue Yuan Road,Shanghai,China
> Postcode:200032
> Email:epistat at gmail.com
> Website: www.statABC.com
> [*************************************************************
> **********]
> oooO:::::::::
> (..):::::::::
> :\.(:::Oooo::
> ::\_)::(..)::
> :::::::)./:::
> ::::::(_/::::
> :::::::::::::
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
> 



This e-mail message is intended only for the named recipient(s) above. It may
contain confidential information. If you are not the intended recipient you are
hereby notified that any dissemination, distribution or copying of this e-mail
and any attachment(s) is strictly prohibited. If you have received this e-mail
in error, please immediately notify the sender by replying to this e-mail and
delete the message and any attachment(s) from your system. Thank you.