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How can I change the default timezone in R? I'm working with time series. All my time series are defined in UTC time zone, but if I print a date it is always done in CET/CEST time zone.
587
Use attr() (base R) or lubridate::with_tz() (tidyverse) to view the same moment of time in a different time zone.
Where and When is R Observed? Romeo Time Zone is often used in aviation and the military as another name for UTC -5. Romeo Time Zone is also commonly used at sea between longitudes 82.5° West and 67.5° West. The letter R may be used as a suffix to denote a time being in the Romeo Time Zone, such as 08:00R or 0800R.
tz returns a date's time zone attribute. When used as a settor, it changes the time zone attribute. R does not come with a predefined list zone names, but relies on the user's OS to interpret time zone names. As a result, some names will be recognized on some computers but not others.
In R, and most other programming languages, UTC is the common, underlying representation of (date)time, and things like timezones are defined in terms of UTC (EST is UTC-5, hence the “-5” above). It's roughly the same as GMT (Greenwich Mean Time), but not quite identical (GMT can have Daylight Saving Time!)
Another way to do it, without changing the whole computer time is using the setenv command like this : Sys.setenv(TZ='GMT')
167
See this good article on changing time zone in R:
http://blog.revolutionanalytics.com/2009/06/converting-time-zones.html
Shortly (in case the link will be unavailable in the future):
# your time string pb.txt <- "2009-06-03 19:30" # convert it to R object for London time zone pb.date <- as.POSIXct(pb.txt, tz="Europe/London") # convert it to PDT time zone format(pb.date, tz="America/Los_Angeles",usetz=TRUE) [1] "2009-06-03 11:30:00 PDT" # can be also done for many date at once d <- c("2009-03-07 12:00", "2009-03-08 12:00", "2009-03-28 12:00", "2009-03-29 12:00", "2009-10-24 12:00", "2009-10-25 12:00", "2009-10-31 12:00", "2009-11-01 12:00") t1 <- as.POSIXct(d,"America/Los_Angeles") cbind(US=format(t1),UK=format(t1,tz="Europe/London")) US UK [1,] "2009-03-07 12:00:00" "2009-03-07 20:00:00" [2,] "2009-03-08 12:00:00" "2009-03-08 19:00:00" [3,] "2009-03-28 12:00:00" "2009-03-28 19:00:00" [4,] "2009-03-29 12:00:00" "2009-03-29 20:00:00" [5,] "2009-10-24 12:00:00" "2009-10-24 20:00:00" [6,] "2009-10-25 12:00:00" "2009-10-25 19:00:00" [7,] "2009-10-31 12:00:00" "2009-10-31 19:00:00" [8,] "2009-11-01 12:00:00" "2009-11-01 20:00:00" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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