Or, convert your object of class Date to POSIXlt, and then use the yday
element of the resulting list. Example:
today <- Sys.Date()
as.POSIXlt(today)$yday
Erik
Martin Hvidberg wrote:
I want to find the DOY (Day of Year) of some dates. I think to substract the
date 1. January from the data to achive this. Something like:
d <- as.Date("2006-03-13") - as.Date("2006-01-01") +1
d
Time difference of 72 days
So far so good. But d is a 'difftime' object. How do I get an Integer value
from that?
I tried severel things, incuding the following:
dd <- as(d,"numeric")
Error in .classEnv(thisClass) :
unable to find an environment containing class "difftime"
Sugestions appriciated...
:-) [EMAIL PROTECTED]
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