[Rd] chron now fails with 4 digit year (PR#443)

[jens.oehlschlaegel-akiyoshi@mdfactory.de]

Full_Name: Jens Oehlschlägel-Akiyoshi
Version: RW0990
OS: Windows NT 4.0 SP5
Submission from: (NULL) (194.175.113.13)


With the version of the chron library included in RW0901
I could create CORRECT chron objects with mm/dd/yyyy

> as.numeric(dates("12/31/1999", format='m/d/y'))
[1] 10956
> as.numeric(dates("01/01/2000", format='m/d/y'))
[1] 10957

wheras backformatting in the print method failed

> dates("12/31/1999", format='m/d/y')
[1] 12/31/99
> dates("01/01/2000", format='m/d/y')
[1] 01/01/100

but now in RW0990

> dates("01/01/2000")
Error in fun(yy, ...) : must be 2-digit (numeric) year specification



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