[R] Julian Dates

[Petr Pikal]

Hallo

On 28 Jan 2004 at 13:13, Massimiliano Tripoli wrote:

> Hi all,
> I have problems with dates format  using "chron" package.
> I don't understand why R by this istruction:
> 
> > dates("01/02/29",out.format="d/m/year")
> [1] 02/Jan/2029

Well, the result probably depends on your system and locale setting.
I would use 4 digit year.

You can use ifelse construction to compute 4 digit years and then you have to 
reconstruct your dates vector probably with paste and as.character.

ifelse(as.numeric(substr("01/02/06",7,8))>5, 
as.numeric(substr("01/02/06",7,8))+1900, 
as.numeric(substr("01/02/06",7,8))+2000)

Cheers
Petr

> 
> > dates("01/02/30",out.format="d/m/year")
> [1] 02/Jan/1930
> 
> 
> reads "29" as 2029
> and "30" as 1930. How could I set the istruction in order to read
> years from "00" to "05" as 2000 to 2005 and "06" to "99" as 1906 to
> 1999 ? Thank you
> 
> Dott. Massimiliano Tripoli
> Dipartimento di Scienze Biomediche e Biotecnologie
> Sezione di Statistica Medica e Biometria
> Universitŕ di Brescia
> tel. +39-030-3717467
> fax +39-030-3701157
> 
> 
> 
> 
> 
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> 
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Petr Pikal
petr.pikal at precheza.cz