Haven’t seen any fixes to this timestamp issue, so I manually removed the time from the plugin code. Look for the line of code under:
/** Set the date and time format */
I modified that line to read as follows:
$datetime_format = apply_filters( 'displaytweets_datetime_format', "l M j" );
You can see the results of this change at alanpringle.com.
Not a perfect fix, but I didn’t care about the timestamp.