r - Grouping posixct-data non-linear -

i have got series of video uploads , want show how many videos has been uploaded in last month, half year, year, 2, year, 3, year ...

published_at of type posixct , should transformed factor levels above.

is there nice way so? seems not first person thinking this.

the dates like:

date<- as.posixct(c("2015-12-11 00:00:01", "2016-01-11 00:00:01", "2014-01-11 00:00:01", "2015-12-11 00:00:01", "2016-04-04 08:22:01", "2013-12-11 00:00:01")                      , format= "%y-%m-%d %h:%m:%s") df<- data.frame(date,                  number=ceiling(abs(rnorm(1:6)))) 

i thought using cut-function don't know how specify breaks

my approach this:

published_at <- as.posixct(c("2015-12-11 00:00:01")                         , format= "%y-%m-%d %h:%m:%s")  library(lubridate) half_year <- interval(start = ymd(sys.date() - months(6)), end = ymd(sys.date()), tzone = "ecst") year <- interval(start = ymd(sys.date() - months(12)), end = ymd(sys.date()), tzone = "ecst") two_years <- interval(start = ymd(sys.date() - months(24)), end = ymd(sys.date()), tzone = "ecst")  published_at %within% c(half_year, year, two_years) #[1] false  true true 

you can dates , perhaps via lapply() or else.