[rhcsa@rhcsa ~]$ echo $PS1"This is my first time to use echo command. "
[\u@\h \W]\$ This is my first time to use echo command. 

[rhcsa@rhcsa ~]$ date +%Y/%m/%d %H:%M:%S %a %y %I %p
date: extra operand ‘%H:%M:%S’
Try 'date --help' for more information.