Despite being located in the /etc/cron.daily, any cron jobs located in this folder do not follow the crontab syntax.
Otherwise you will get this error :
run-parts : failed to exec /etc/cron.daily/ntp exec format error
Instead, make sure to set the programming language interpreter path used by your scripts using the shebang : #!
If it is a bash shell script, the first line of your job script must start with :