Regarding the new R 1.9.0 Date class, it would be nice to have
as.Date.numeric .
1. as.numeric(x) works for Date objects and it would be convenient
to also have the inverse.
2. It leads to some nice additive properties for integer x and y:
as.Date(x+y) = as.Date(x) + as.Date(y)
= as.Date(x) + y = as.Date(y) + x
3. It gives a pleasing way to quickly get the origin:
as.Date(0)
4. The corresponding ability is already available in chron,
e.g. chron(0), and I have found that I did make use of it
in my work with chron.
5. Its particularly convenient in testing since you can quickly
generate a sequence of dates like this:
as.Date(1:100)
Its quite simple to implement:
as.Date.numeric <- function(x) structure( floor(x), class = "Date" )
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