Extracting day of month from Date objects

I've always found the chron library to be useful for
tasks like this:

x <- round(runif(10)*100000, digits=0)
y <- as.Date(x, origin="1970-01-01")
library(chron)
days(y)

? [1] 7 ?25 26 25 10 24 1 ?31 12 8
31 Levels: 1 < 2 < 3 < 4 < 5 < 6 < 7 < 8 < 9 < 10 < 11 < 12 < 13 < ... < 31

Notice that it returns the days as factors.

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? - Phil Spector
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Statistical Computing Facility
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Department of Statistics
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?UC Berkeley

On May 24, 2011, at 10:19 AM, Kang Min wrote:

I have another question -

I'd like to extract dates from a vector of yyyy-mm-dd, so I just want
the dd.

x <- round(runif(10)*100000, digits=0)
y <- as.Date(x, origin="1970-01-01")

I tried this based on the code that Jim provided, but it just printed
the whole date. I think I just need to tweak it a little, but haven't
been able to figure it out.

I've always found the chron library to be useful for
tasks like this:

x <- round(runif(10)*100000, digits=0)
y <- as.Date(x, origin="1970-01-01")
library(chron)
days(y)

[1] 7  25 26 25 10 24 1  31 12 8 31 Levels: 1 < 2 < 3 < 4 < 5 < 6 <  
7 < 8 < 9 < 10 < 11 < 12 < 13 < ... < 31

Notice that it returns the days as factors.