12 hour select field

gistfile1.php

<?php

function select_12_hour()
{
	$return = '';

	for ($i = 0; $i < 24; $i++)
	{
		$period = ($i < 12) ? 'a.m.' : 'p.m.';

		$k = $i;

		if ($i === 0)
		{
			$k = '12';
		}

		if ($i > 12)
		{
			$k = $i - 12;
		}

		$j = str_pad($i, 2, '0', STR_PAD_LEFT);

		$return .= "<option value=\"{$j}:00:00\">{$k}:00 {$period}</option>" .
			"<option value=\"{$j}:15:00\">{$k}:15 {$period}</option>" .
			"<option value=\"{$j}:30:00\">{$k}:30 {$period}</option>" .
			"<option value=\"{$j}:45:00\">{$k}:45 {$period}</option>";
	}

	return $return;
}