Everyone's memory is better than mine: I can't even remember the command I typed, so I need to hunt it down from the context: current directory, date or previous commands.
I use a zsh precmd() along the lines of
echo "$(date "+%Y-%m-%d.%H:%M:%S") $(pwd) $(fc -ln -1)" >> ~/bash/bash-history-$(date "+%Y-%m-%d").log;