gerard749 on "add date, function.php"

Hi,
I put the following code in my child themes function.php file:

add_filter('widget_text', 'do_shortcode');

function displaydate(){
return date('l, F jS, Y');
}
add_shortcode('date', 'displaydate');

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In the General Settings when I set the timezone to New York (correct time) or UTC-4, at 8pm the date changes to the following day.
Any help would be appreciates.
Thank You,
Jerry

WordPress 3.6
Thematic Theme 1.0.4