Debian scheduled tasks

Debian scheduled task-Debian information of the Linux release-details are as follows. The original task plan In Debian is so simple. Of course, I only need to implement simple functions.

For example, the company wants to synchronize the time of Debian on the Virtual Machine with NTP one hour, because the time of the virtual machine is too slow, which is about one hour and five minutes slower... Google, the original solution is so simple:
In the root state:

# Echo 'ntpdate time.nist.gov '>/etc/cron. hourly/time
# Chmod + x/etc/cron. hourly/time

Done

That's simple, haha.