Are you asking for the command on how to copy files from hdfs to a local dir? Or do you ask for the scheduling to be executed on a specific date? Or do you need to know on how to use the date in a file or directory name?
the first one: use the hdfs command like 'hdfs dfs -get <hfdslocation> <localdst>' further documentation at: https://hadoop.apache.org/docs/r2.4.1/hadoop-project-dist/hadoop-common/FileSystemShell.html
the second one: try using cron, or the scheduler used in your environment
the third one: check the option of the date command and add it the filename in command line quoted with backticks (`)