r - Getting the week from the date -


i have series of dates , trying week of year. seems innacurate.

order_date = c("2017-06-10","2017-06-11","2017-06-12","2017-06-13",                "2017-06-14","2017-06-15","2017-06-16") strftime(as.posixlt(order_date) ,format="%w") week(order_date)

06/10 saturday , there's no way 06/10 , 06/11 of same week.

any ideas on how this?

working date-time not straightforward. illustration of question , comments members. added few days make point more clear.

library(lubridate) order_date = c("2017-06-10","2017-06-11","2017-06-12","2017-06-13",                "2017-06-14","2017-06-15","2017-06-16", "2017-06-17",                "2017-06-18", "2017-06-19") strftime(as.posixlt(order_date) ,format="%w") # week starts on monday #  [1] "23" "23" "24" "24" "24" "24" "24" "24" "24" "25"  strftime(as.posixlt(order_date) ,format="%u") # week starts on sunday #  [1] "23" "24" "24" "24" "24" "24" "24" "24" "25" "25"  week(order_date) # week starts on sunday #  [1] 23 24 24 24 24 24 24 24 25 25

in related question: here, used @uweblock 's isoweek package circumvent problems year-ends after extensive testing. here code:

library(isoweek) library(stringr) str_replace(isoweek(order_date), "201.-w", "")  # week starts on monday (and follows iso 8601) #  [1] "23" "23" "24" "24" "24" "24" "24" "24" "24" "25"

you can more information ?isoweek.

please let me know whether want.


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