Is there a way to make as.Date() and strptime() process strings with
negative years? It appears that Date objects can contain negative years and
you can convert them to strings, but you can't convert them back to Date
objects.
x - as.Date(c(0001-01-24, 0500-01-24))
as.character(x)
# 0001-01-24
Hello,
Is there a bug with negative dates? Just see:
seq(as.Date(-01-01), length = 22, by = -1 year)
[1] -01-01 000/-01-01 000.-01-01 000--01-01 000,-01-01
[6] 000+-01-01 000*-01-01 000)-01-01 000(-01-01 000'-01-01
[11] 00/0-01-01 00//-01-01 00/.-01-01 00/--01-01 00/,-01-01
[16]
?as.Date
Why would pre years be handled correctly? The help file
explicitly states that they likely will not.
Note:
The default formats follow the rules of the ISO 8601 international
standard which expresses a day as ‘2001-02-03’.
If the date string does not specify the
It looks different on my system (Mac, R 2.15.1)
seq(as.Date(-01-01), length = 22, by = -1 year)
[1] -01-01 -001-01-01 -002-01-01 -003-01-01 -004-01-01
[6] -005-01-01 -006-01-01 -007-01-01 -008-01-01 -009-01-01
[11] -010-01-01 -011-01-01 -012-01-01 -013-01-01 -014-01-01
[16] -015-01-01
On my earlier post I forgot to mention the sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=Portuguese_Portugal.1252
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C
[5]
