How to see history with time in linux

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First set the variable HISTTIMEFORMAT as given below.
root@cpaneltest [~]# HISTTIMEFORMAT="%d/%m/%y %T "

Now checking the variable value :
root@cpaneltest [~]# echo $HISTTIMEFORMAT
%d/%m/%y %T

root@cpaneltest [~]#
Now run the command history.
root@cpaneltest [~]# history

   21  16/08/11 00:39:47 for i in $(cat ip) ; do echo $i; done
   22  16/08/11 00:39:47 for i in $(cat ip) ; do ping -t1 $i; done