timestamp of last file status change
None
None
| std::stat | retrieves status information about the specified file | 
| std::fstat | retrieves status information about the file described by the specified file descriptor | 
| std::access_time_of | timestamp of last file access | 
| std::modification_time_of | timestamp of last file modification | 
| std::is_a_directory | returns true if the file is a directory | 
| std_types::stat | returns the status change time of the specified file |