=== Showing History Time ===
When running bash command "history", it regularly excludes the time stamps.
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=== Session Specific TimeStamps ===
You can set this by running the following command:
<sxh bash>
HISTTIMEFORMAT=format
</sxh>
For example, the following will set your current session in the specified format:
<sxh bash>
HISTTIMEFORMAT="%y/%m/%d %T
</sxh>
Running history will now show you time stamps and date stamps:
<sxh bash>
# history | tail -3
 1055  17/09/16 09:46:23 echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile ; source ~/.bash_profile
 1056  17/09/16 09:46:27 HISTTIMEFORMAT="%d/%m/%y"
 1057  17/09/16 09:46:30 history | tail -3
</sxh>
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=== Permanent Time Stamp ===
If you wish to set the time stamp permanently then you can run the following command for the user you are logged in as:
<sxh bash>
echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile ; source ~/.bash_profile
</sxh>