Set history command with time stamps.

[George]

If you are using a bash shell then using following command you can set the time in history so that you can found out the correct time period when command was fired.

HISTTIMEFORMAT="%D %T"

[Christina]

If you are setting HISTTIMEFORMAT for the first time then all entries prior to setting the variable will get the time stamp of the time when the variable was set.

Exit your bash and open a new one and take a look:

tail ~/.bashrc_history.