extract day number of year from dates

Question

I have a list of dates like these:

library(lubridate)
my.dates <- c("03-01-2006", "28-01-2006", "12-01-2008", "02-02-2006", "03-03-2008")
my.dates <- dmy(my.dates)

I need to extract, the day number of the year from each date as below, where 1st January is day 1:

day.number <- c(3, 28, 12, 33, 62)

I've had a good hunt around google and SO but cannot find an easy way of doing this. Help appreciated, thanks.

Answer 1

you can use yday function from lubridate since you're already using it:

> yday(my.dates)
# [1]  3 28 12 33 63

Answer 2

Try POSIXlt and its attributes(my.dates)

my.dates = as.POSIXlt(my.dates,format="%d-%m-%Y")
my.dates$mday
[1]  3 28 12  2  3
my.dates$yday
[1]  2 27 11 32 62