post-date.js

gistfile1.js

(function($) {
var
	dates = $('.entry-header .entry-meta'),
	page = $('#page'),
	post = $('#content > article.post')
;

$(window).on('resize', keepDateAligned);

keepDateAligned();

function keepDateAligned() {
	dates.css('left', -(post.offset().left - page.offset().left) - 5 + 'px');
}

})(jQuery);