will give you a clue and direct you to getty
so then from man getty
we find this...
The issue-file (/etc/issue or the file set with the -f option) may contain certain escape codes to
display the system name, date and time etc. All escape codes consist of a backslash (\) immediately
followed by one of the letters explained below.
b Insert the baudrate of the current line.
d Insert the current date.
s Insert the system name, the name of the operating system.
l Insert the name of the current tty line.
m Insert the architecture identifier of the machine, eg. i486
n Insert the nodename of the machine, also known as the hostname.
o Insert the domainname of the machine.
r Insert the release number of the OS, eg. 1.1.9.
t Insert the current time.
u Insert the number of current users logged in.
U Insert the string "1 user" or "<n> users" where <n> is the number of current users logged in.
v Insert the version of the OS, eg. the build-date etc.
Example: On my system, the following /etc/issue file:
This is \n.\o (\s \m \r) \t
This is thingol.orcan.dk (Linux i386 1.1.9) 18:29:30