set_time_file/3

Documentation
- Reference manual
- Packages
  - SWI-Prolog C-library
    - library(filesex): Extended operations on files

Availability::- use_module(library(filesex)).(can be autoloaded)

[det]set_time_file(+File, -OldTimes, +NewTimes)

Query and set POSIX time attributes of a file. Both OldTimes and NewTimes are lists of option-terms. Times are represented in SWI-Prolog's standard floating point numbers. New times may be specified as now to indicate the current time. Defined options are:

access(Time): Describes the time of last access of the file. This value can be read and written.
modified(Time): Describes the time the contents of the file was last modified. This value can be read and written.
changed(Time): Describes the time the file-structure itself was changed by adding (link()) or removing (unlink()) names.

Below are some example queries. The first retrieves the access-time, while the second sets the last-modified time to the current time.

?- set_time_file(foo, [access(Access)], []).
?- set_time_file(foo, [], [modified(now)]).