issue with flooring and ceiling dates #645
Description
I noticed some strange results where ceiling date sometimes does not produce a rounded date (see the example where the time becomes 1 am)
> a<-structure(631166450, class = c("POSIXct", "POSIXt"), tzone = "")
> a
[1] "1990-01-01 05:00:50 CET"
> floor_date(a,'days');ceiling_date(a,'days')
[1] "1990-01-01 CET"
[1] "1990-01-02 01:00:00 CET"
>
> a<-structure(631166450, class = c("POSIXct", "POSIXt"), tzone = "CET")
> a
[1] "1990-01-01 05:00:50 CET"
> floor_date(a,'days');ceiling_date(a,'days')
[1] "1990-01-01 CET"
[1] "1990-01-02 CET"
>
> Sys.timezone()
[1] "Europe/Zurich"
> sessionInfo()
R version 3.4.2 (2017-09-28)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: OS X El Capitan 10.11.6
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lubridate_1.7.2 browMod_0.1 Rcpp_0.12.15 move_3.0.3 rgdal_1.2-16 raster_2.6-7 sp_1.2-7 geosphere_1.5-7 mgcv_1.8-23
[10] nlme_3.1-131
loaded via a namespace (and not attached):
[1] compiler_3.4.2 pillar_1.1.0 plyr_1.8.4 tools_3.4.2 digest_0.6.15 memoise_1.1.0 tibble_1.4.2 gtable_0.2.0
[9] lattice_0.20-35 rlang_0.1.6 Matrix_1.2-12 yaml_2.1.16 parallel_3.4.2 gridExtra_2.3 httr_1.3.1 stringr_1.2.0
[17] xml2_1.2.0 stats4_3.4.2 grid_3.4.2 inline_0.3.14 R6_2.2.2 rstan_2.17.3 ggplot2_2.2.1 magrittr_1.5
[25] splines_3.4.2 scales_0.5.0 codetools_0.2-15 StanHeaders_2.17.2 colorspace_1.3-2 stringi_1.1.6 lazyeval_0.2.1 munsell_0.4.3