The Julian date is the number of days since a specific date. In R, and many other languages, this is the number of days since January 1, 1970. This is a common method used in calendar applications. In this article, we will learn how to get the Julian date in R.
To get the Julian date, we can either use the
as.integer method or the
today = Sys.Date() as.integer(today) #  18741
as.integer method simply converts our date to an integer which is the number of days since January 1, 1970. Let's see the
julian method now.
today = Sys.Date() jul = julian(today) jul #  18741 # attr(,"origin") #  "1970-01-01" attr(jul, "origin") #  18741
The julian method returns a more complex object and stores the number of days in an attribute called "origin". We need to use another method
attr to extract the value.