man rdate (Administration système) - rdate
NAME
rdate - set the system's date from a remote host
SYNOPSIS
[-psau]host [port]
DESCRIPTION
displays and sets the local date and time from the host name or address given as the argument. It uses the RFC868 protocol which is usually implemented as a built-in service of inetd(8) .
Available options:
- -p
- Do not set, just print the remote time
- -s
- Do not print the time.
- -a
- Use the adjtimex() call to gradually skew the local time to the remote time rather than just hopping.
- -u
- Use UDP instead of TCP as the transport.
FILES
- /var/log/wtmp
- A record of date resets and time changes.