Scenario: How to display date and time in bash history command on CentOS/RHEL.

By default default history command output didn’t show date and time.

[bachem@centos7ht ~]$ history
 1 sudo su
 2 su -
 3 sudo su
 4 su -
 5 ulimit -a

Below how to setup display date and time in history bash command.
– Steps to setup on a single user,example on bachem user
$ echo 'HISTTIMEFORMAT="%F %T "' >> /home/bachem/.bash_profile
it will add HISTTIMEFORMAT="%F %T " in the bottom file /home/bachem/.bash_profile.

then run below command to apply
$ source /home/bachem/.bash_profile

Now when run history will show date and time on each bash command.

[bachem@centos7ht ~]$ echo 'HISTTIMEFORMAT="%F %T "' >> /home/bachem/.bash_profile
[bachem@centos7ht ~]$ source /home/bachem/.bash_profile
[bachem@centos7ht ~]$ history
 1 2017-10-09 15:45:38 sudo su
 2 2017-10-09 15:45:38 su -
 3 2017-10-09 15:45:38 sudo su
 4 2017-10-09 15:45:38 su -
 5 2017-10-09 15:45:38 ulimit -a

– Steps to setup for system wide all users.
1) Login as root
2) Run below command
# echo 'HISTTIMEFORMAT="%F %T "' >> /etc/profile
it will add HISTTIMEFORMAT="%F %T " in the bottom file /etc/profile.

then run below command to apply
# source /etc/profile

Now when run history will show date and time on each bash command.

[root@centos7ht ~]# echo 'HISTTIMEFORMAT="%F %T "' >> /etc/profile
[root@centos7ht ~]# source /etc/profile
[root@centos7ht ~]# history
 1 2017-10-09 16:53:33 yum install bind-utils
 2 2017-10-09 16:53:33 yum update
 3 2017-10-09 16:53:33 ip a
 4 2017-10-09 16:53:33 nslookup detik.com
 5 2017-10-09 16:53:33 nmtui

Reference:
https://www.2daygeek.com/display-date-time-linux-bash-history-command/