Dear list, I'm experiencing problems with converting strings of the format "YYYY-<weekofyear>" (e.g. 2016-01, 2016-52) to proper POSIX dates which (I think) I need in order to retrieve the month-of-the-year number.
Simpler put: I'd like to match week-of-the-year numbers to month-of-the-year numbers. Ideally, the week-of-the-year number would follow the ISO 8601 convention (i.e. format argument "%V") instead of the US (format argument "%U") or UK (format argument "%W") convention. After posting this to Stackoverflow, I have strong reasons to believe that the issue is caused by Windows: http://stackoverflow.com/questions/41616407/match-iso-8601-week-numbers-to-month-of-year-on-windows-with-german-locale/41617215?noredirect=1#comment70436768_41617215 Example: # ISO 8601 convention: (yw <- format(posix, "%Y-%V"))# [1] "2015-52" "2015-53" "2016-53" "2016-01" ywd <- sprintf("%s-1", yw)(as.POSIXct(ywd, format = "%Y-%V-%u"))# [1] "2015-01-12 CET" "2015-01-12 CET" "2016-01-12 CET" "2016-01-12 CET"# -> utterly wrong!!! # US convention: (yw <- format(posix, "%Y-%U"))# [1] "2015-51" "2015-52" "2016-00" "2016-01" ywd <- sprintf("%s-1", yw)(as.POSIXct(ywd, format = "%Y-%U-%u"))# [1] "2015-12-21 CET" "2015-12-28 CET" NA "2016-01-04 CET"# -> NA problem for week 00A fellow R user tested this on both macOS and Ubuntu and he didn't encounter the issue: some_dates <- as.POSIXct(c("2015-12-24", "2015-12-31", "2016-01-01", "2016-01-08")) (year_week <- format(some_dates, "%Y %U"))## [1] "2015 51" "2015 52" "2016 00" "2016 01" (year_week_day <- sprintf("%s 1", year_week))## [1] "2015 51 1" "2015 52 1" "2016 00 1" "2016 01 1" (as.POSIXct(year_week_day, format = "%Y %U %u"))## [1] "2015-12-21 EST" "2015-12-28 EST" "2016-01-04 EST" "2016-01-04 EST" My session info: > sessionInfo() R version 3.3.2 (2016-10-31) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows >= 8 x64 (build 9200) locale:[1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252 LC_MONETARY=German_Germany.1252 [4] LC_NUMERIC=C LC_TIME=English_United States.1252 attached base packages:[1] stats graphics grDevices utils datasets methods base other attached packages: [1] fva_0.1.0 digest_0.6.10 readxl_0.1.1 dplyr_0.5.0 plyr_1.8.4 magrittr_1.5 [7] memoise_1.0.0 testthat_1.0.2 roxygen2_5.0.1 devtools_1.12.0 loaded via a namespace (and not attached): [1] Rcpp_0.12.8 lubridate_1.6.0 assertthat_0.1 packrat_0.4.8-1 crayon_1.3.2 withr_1.0.2 [7] R6_2.2.0 DBI_0.5-1 stringi_1.1.2 rstudioapi_0.6 tools_3.3.2 stringr_1.1.0 [13] tibble_1.2 Any idea on how to workaround this issue on Windows? Thanks and best regards, Janko Thyson [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
