Hello,
In all header files you have to change line 33.
echo date_i18n('l, F j, Y', time()); ?>
to
echo get_the_date(); ?>
UPDATED:
echo date_i18n(get_option('date_format'));?>
Or modify your format as you wish. Read more here: http://codex.wordpress.org/Formatting_Date_and_Time
Thanks!
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