[R] handle dates in R?

[Peter Dalgaard]

Armstrong, Whit wrote:
> dts <- c("2004-8-1","2004-10-1","2001-9-1")
> strptime(dts,"%Y-%m-%d")
> julian(strptime(dts,"%Y-%m-%d")) 
>
>
>   
Why do people insist on missing the obvious?

> x <- c("2004-8-1","2004-10-1","2001-9-1")
> as.Date(x) - as.Date("1960-1-1")
Time differences in days
[1] 16284 16345 15219

>> -----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,
>>
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>> [*************************************************************
>> **********]
>> 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
>> [*************************************************************
>> **********]
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>>     
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907