WordPress plugin that adds a Quick Date Picker to the New/Edit Post screen

wordpress-quick-pick.php

<?php
/**
 * Add a popup menu to the post screen that allows you to quickly choose a date within the last two weeks.
 *
 * @wordpress-plugin
 * Plugin Name:       Date Quick Pick
 * Plugin URI:        http://thunderguy.com/bennett/
 * Description:       Quickly choose a post date for posts.
 * Version:           1.0.0
 * Author:            Bennett McElwee
 * Author URI:        http://thunderguy.com/bennett/
 * License:           GPL-2.0+
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

add_action('post_submitbox_misc_actions', function () {
	echo <<<'EOD'
	<script>
	(function($) {
		$(function() {
			var dayNames = ["Sun","Mon","Tue","Wed","Thu","Fri","Sat"];
			var monthNames = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];

			$(".edit-timestamp").after("<div><select class='day-picker'><option>Quick pick...</option></select></div>");
			var sysTime = new Date().getTime();
			for (var i = 0; i < 15; ++i) {
				var date = new Date(sysTime - i * 24 * 60 * 60 * 1000);
				var day   = date.getDate();
				var month = date.getMonth() + 1; if (month < 10) { month = "0" + month; }
				var year  = date.getFullYear();
				var text = dayNames[date.getDay()] + " " + day + " " + monthNames[date.getMonth()] + " " + year;
				if (i == 0) { text = text + " - today"; }
				else if (i == 1) { text = text + " - yesterday"; }
				$(".day-picker").append("<option value='"+year+"-"+month+"-"+day+"'>"+text+"</option>")
			}
			$(".day-picker").change(function() {
				var date = $(this).val().split("-");
				$("#aa").val(date[0]);
				$("#mm").val(date[1]);
				$("#jj").val(date[2]);
				$(this).val("");
				$(".save-timestamp").click();
			});
		});
	})(window.jQuery);
	</script>
EOD;
});