The history of executed commands is stored in your shell. Try adding something like you ~/.bashrc
export HISTTIMEFORMAT="%m/%d - %H:%M:%S: "
It will change the HISTTIMEFORMAT variable, and bash will save the timestamp in its history accordingly. Then your story will look like this.
487 08/16 - 16:12:01: cd Downloads 488 08/16 - 16:12:04: ls -a 489 08/16 - 16:12:37: cat README | less 490 08/16 - 16:12:58: pkg-config --list-all | grep webkit 491 08/16 - 16:13:04: history
Available identifiers
%d - Day %m - Month %y - Year %T - Time %H - Hours %M - Minutes %S - Seconds
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