Invalid date format for error message from trac-admin milestone complete operation

[Ryan J Ollos]

The first error message gives an invalid date format.

$ trac-admin tracdev milestone completed milestone110 10/10/2013
TracError: "10/10/2013" is an invalid date, or the date format is not known. Try "MM/DD/YY hh:mm:ss" instead

(t5658)user@ubuntu:~/Workspace/t5658$ trac-admin tracdev milestone completed milestone110 10/10/2013 12:12:12
Error: Invalid arguments

milestone completed <name> <completed>

    Set milestone complete date

    The <completed> date must be specified in the "YYYY-MM-DD" format.
    Alternatively, "now" can be used to set the completion date to the current
    time. To remove the completion date from a milestone, specify an empty
    string ("").

I'm immediately reminded of [12087].