I am trying to convert time zone using only dplyr syntax and the attr function, without loading other packages.
Reprex:
dt1 <- as.POSIXct("2010-01-01 08:00:00", tz = "GMT")
dt <- seq(dt1, length = 10, by = "1 day")
I could convert into the right timezone using attr:
attr(dt, "tzone")
[1] "GMT"
attr(dt, "tzone") <- "Australia/Sydney" # convert to intended tz
What I am interested in though how could I incorporate attr in dplyr::mutate syntax?
As far as a chain-able solution is concerned (I assume that's what you mean by "using dplyr syntax"), you could use .POSIXct as in
library(magrittr)
dt %>% .POSIXct(tz = "Australia/Sydney")
#[1] "2010-01-01 19:00:00 AEDT" "2010-01-02 19:00:00 AEDT"
#[3] "2010-01-03 19:00:00 AEDT" "2010-01-04 19:00:00 AEDT"
#[5] "2010-01-05 19:00:00 AEDT" "2010-01-06 19:00:00 AEDT"
#[7] "2010-01-07 19:00:00 AEDT" "2010-01-08 19:00:00 AEDT"
#[9] "2010-01-09 19:00:00 AEDT" "2010-01-10 19:00:00 AEDT"
Here is a minimal dplyr::mutate example
data.frame(dt = dt) %>%
mutate(dt_Australia = .POSIXct(dt, tz = "Australia/Sydney"))
# dt dt_Australia
#1 2010-01-01 08:00:00 2010-01-01 19:00:00
#2 2010-01-02 08:00:00 2010-01-02 19:00:00
#3 2010-01-03 08:00:00 2010-01-03 19:00:00
#4 2010-01-04 08:00:00 2010-01-04 19:00:00
#5 2010-01-05 08:00:00 2010-01-05 19:00:00
#6 2010-01-06 08:00:00 2010-01-06 19:00:00
#7 2010-01-07 08:00:00 2010-01-07 19:00:00
#8 2010-01-08 08:00:00 2010-01-08 19:00:00
#9 2010-01-09 08:00:00 2010-01-09 19:00:00
#10 2010-01-10 08:00:00 2010-01-10 19:00:00