问题
I'm looking to find the day of year for a POSIXct class object with lubridate. For example, 12-9-2015 is day 343.
It's easy to find the day of the week or month with lubridate:
> lubridate::wday("2015-12-09 04:27:56 EST", labels = T)
Wed
> lubridate::day("2015-12-09 04:27:56 EST")
9
Is there an easy way to do so for the day of the year? I've searched the documentation and other questions but have not (yet) found an answer.
回答1:
The correct function is yday, as in
lubridate::yday(Sys.time())
来源：https://stackoverflow.com/questions/34189367/find-day-of-year-with-the-lubridate-package-in-r