Returns the date and time, in coordinated universal time (UTC), that the specified file or directory was last written to.
The caller does not have the required permission.
is empty, contains only white spaces, or contains invalid characters. is . The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters. is in an invalid format.