Re: [R] help working with date values

Re: [R] help working with date values

Re: [R] help working with date values

steve_fried...@nps.gov wrote: My data contains a variable observation_date and it contains values as: 1985-09-02 1985-09-15 1985-07-31 1985-09-02 I need to process data annually rather than daily, therefore I'm trying to 1) either extract the first 4 digits from this field and use them as

[R] help working with date values

My data contains a variable observation_date and it contains values as: 1985-09-02 1985-09-15 1985-07-31 1985-09-02 I need to process data annually rather than daily, therefore I'm trying to 1) either extract the first 4 digits from this field and use them as a new variable year or 2) keep

Re: [R] help working with date values

Here are a few ways: xx - c(1985-09-02, 1985-09-16, 1985-07-31, 1985-07-31, 1985-09-02, 1985-08-26, 1985-07-31, 1985-08-26, 1985-09-02, 1985-09-16) # 1 library(zoo) as.numeric(floor(as.yearmon(xx))) [1] 1985 1985 1985 1985 1985 1985 1985 1985 1985 1985 #2 as.numeric(substr(xx, 1, 4))