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List all the targets whose last successful run occurred before a certain point in time. Combine with tar_invalidate(), you can use tar_older() to automatically rerun targets at regular intervals. See the examples for a demonstration.


  names = NULL,
  inclusive = FALSE,
  store = targets::tar_config_get("store")



A POSIXct object of length 1, time threshold. Targets older than this time stamp are returned. For example, if time = Sys.time() - as.difftime(1, units = "weeks") then tar_older() returns targets older than one week ago.


Names of eligible targets. Targets excluded from names will not be returned even if they are old. You can supply symbols or tidyselect helpers like any_of() and starts_with(). If NULL, all names are eligible.


Logical of length 1, whether to include targets built at exactly the time given.


Character of length 1, path to the targets data store. Defaults to tar_config_get("store"), which in turn defaults to _targets/. When you set this argument, the value of tar_config_get("store") is temporarily changed for the current function call. See tar_config_get() and tar_config_set() for details about how to set the data store path persistently for a project.


A character vector of names of old targets with recorded timestamp metadata.


Only applies to targets with recorded time stamps: just non-branching targets and individual dynamic branches. As of targets version 0.6.0, these time stamps are available for these targets regardless of storage format. Earlier versions of targets do not record time stamps for remote storage such as format = "url" or repository = "aws" in tar_target().

See also


if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
tar_dir({ # tar_dir() runs code from a temp dir for CRAN.
  list(tar_target(x, seq_len(2)))
}, ask = FALSE)
# targets older than 1 week ago
tar_older(Sys.time() - as.difftime(1, units = "weeks"))
# targets older than 1 week from now
tar_older(Sys.time() + as.difftime(1, units = "weeks"))
# Everything is still up to date.
# Invalidate all targets targets older than 1 week from now
# so they run on the next tar_make().
invalidate_these <- tar_older(Sys.time() + as.difftime(1, units = "weeks"))