with_tz returns a date-time as it would appear in a different time zone. The actual moment of time measured does not change, just the time zone it is measured in. with_tz defaults to the Universal Coordinated time zone (UTC) when an unrecognized time zone is inputted. See Sys.timezone() for more information on how R recognizes time zones.

with_tz(time, tzone = "")



a POSIXct, POSIXlt, Date, chron date-time object or a data.frame object. When a data.frame all POSIXt elements of a data.frame are processed with with_tz() and new data.frame is returned.


a character string containing the time zone to convert to. R must recognize the name contained in the string as a time zone on your system.


a POSIXct object in the updated time zone

See also



x <- as.POSIXct("2009-08-07 00:00:01", tz = "America/New_York") with_tz(x, "GMT")
#> [1] "2009-08-07 04:00:01 GMT"