save date and time for each command in history

export HISTTIMEFORMAT='%F %T '
Date-time format: YYYY-MM-DD HH:MM:SS
Sample Output
4459  2009-09-26 19:04:42 ss -p | grep STA
4460  2009-09-26 19:05:30 lsof -P -i -n | cut -f 1 -d " "| uniq | tail -n +1
4461  2009-09-26 19:05:33 lsb_release -a
4462  2009-09-26 19:06:02 mkdir backup
4463  2009-09-26 19:08:54 seq -s " " -w 3 20
4464  2009-09-26 19:09:04 cat   .bashrc  | less 
4465  2009-09-26 19:10:54 history

7
2009-09-26 17:13:23

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