Time of command execution

How to get time of execution of any command in Unix/Linux

Simply execute the following command on shell prompt and you will get date and time execution of any command.

$ export HISTTIMEFORMAT='%F %T '

To make it permanent edit the

To display timezone:

$ export HISTTIMEFORMAT='%d-%b-%Y %r %Z'

$ history

351 08-Sep-2009 09:53:47 PM PDT ls -lrt

352 08-Sep-2009 09:53:49 PM PDT cd ..

To display AM / PM: You can use %r option

To display in dd-MON-YY time format: You can format it as you want %d-%b-%Y %r