bug adding days to POSIXct object in version 1.7.2

[IanKopacka]

Using lubridate version 1.7.2 I have encountered the following behaviour when adding one day to a POSIXct object:

as.POSIXct("2017-07-01", format = "%Y-%m-%d") + days(1)
# [1] "2017-06-02 02:00:00 CEST"

The month is changed from july to june. This only happens when certain other packages are loaded (e.g. rgdal), and it doesn't happen every time you execute it (?):

library(lubridate)
library(rgdal)
as.POSIXct("2017-07-01", format = "%Y-%m-%d") + days(1)
as.POSIXct("2017-07-01", format = "%Y-%m-%d") + days(1)
# [1] "2017-07-02 CEST"
# [1] "2017-06-02 02:00:00 CEST"

It also doesn't happen with all dates, some dates seem to work fine (e.g. "2017-07-02")

as.POSIXct("2017-07-02", format = "%Y-%m-%d") + days(1)
# [1] "2017-07-03 02:00:00 CEST"

and seems to work when specifying a time zone:

as.POSIXct("2017-07-01", format = "%Y-%m-%d", tz = "CET") + days(1)
# [1] "2017-07-02 CEST"

Here is my session info:

R version 3.4.3 (2017-11-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default

locale:
[1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252   
[3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C                   
[5] LC_TIME=German_Germany.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] rgdal_1.2-16    sp_1.2-7        lubridate_1.7.2 rj_2.1.0-13    

loaded via a namespace (and not attached):
[1] compiler_3.4.3  magrittr_1.5    tools_3.4.3     rj.gd_2.1.0-2  
[5] Rcpp_0.12.15    stringi_1.1.6   grid_3.4.3      stringr_1.2.0  
[9] lattice_0.20-35

[vspinu]

This is a version of #642. Could you please move the discussion there. Thanks.

[vspinu]

It should have been fixed in master. Could you please devtools::install_github("tidyverse/lubridate)" and confirm?

[IanKopacka]

It works with the latest github version. Thanks!