Userscript to set stock due date on new TradeGecko purchase orders to current date

tradegecko-new-purchase-order-date.user.js

// ==UserScript==
// @name TG PO Stock Due Changer
// @description Set stock due date on new TradeGecko purchase orders to current date
// @match https://go.tradegecko.com/*
// @version 0.2
// ==/UserScript==

var targetPage = '/purchase_orders/new';
var currentPage = window.location.pathname;
if (currentPage == targetPage) {
	updateStockDueDate();
}
setInterval(function() {
    if (currentPage != window.location.pathname) {
        currentPage = window.location.pathname;
        if (currentPage == targetPage) {
			updateStockDueDate();
		}
    }
}, 2000);

function updateStockDueDate() {
	var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
	var today = new Date();
	$('dt:contains("Stock Due")').siblings('.date-picker').find('input').val(today.getDate() + ' ' + months[today.getMonth()] + ' ' + today.getFullYear()).trigger("change");
}