From the Manhattan theme author:
I moved to another site, which is why the theme page no longer links.
But here is the answer:
in the archive.php, index.php, search.php and single.php
there is a function <?php the_date(‘l, F jS, Y’) ?> or
the_time(‘l, F jS, Y’)
I forget which. but the ‘l,F jS, Y’ hardwires the date/time format.
I pre-set it to the American way. Hey. Manhattan is in America.
Just change it to <?php the_date() ?> or <?php the_time() ?>
Remove the ‘l,F jS, Y’
That is all.
Then you can amend it in the general settings of the dashboard control panel.