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JavaScript to show <div> after a certain date

I believe this is a relatively simple question (a JavaScript noob here), but I can't seem to find a thread for this particular date function. I am doing website migration for an academic society from a PHP-based site to a drupal CMS. Some of the PHP has obviously broken and I'm trying to replace simple scripts with Javascript. One issue that is giving me a lot of trouble is how to get a text to appear only AFTER a certain date. In PHP my functioning code is:
<?php if (date('YmdH') > 2018011710 ) { ?>
<p class="error">Please note that the deadline for submitting proposals has passed.</p>
<?php } ?>
So I need something in JavaScript to do the same. Here is what I came up with (I apologize in advance for my sloppy code as I'm a beginner with JavaScript):
First CSS to hide the DIV:
<style type="text/css">
.DateDiv { display: none;}
</style>
Then the div itself:
<div class="DateDiv">
<h3>Please note that the deadline for submitting proposals has passed.</h3>
</div>
Finally, my JavaScript, which is not working:
<script>
$(document).ready(function() {
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth();
var yyyy = today.getFullYear();
if(dd<10) {
dd = '0'+dd
}
if(mm<10) {
mm = '0'+mm
}
today = mm + '/' + dd + '/' + yyyy;
// show only if current date is after January 16, 20018
if (today > 0, 16, 2018) {
$(".DateDiv").show();
}
});
</script>
If anyone could help me sort this out I would be very grateful. If I'm going about this in a manner that is more complicated than it needs to be I'd also appreciate any advice.
Thanks in advance.
PS: I am not asking to compare two dates, but to display a text after a certain date.

you just might want to do something like this:
if (new Date() >= new Date(2018, 0, 16))
months always start at 0 while days start at 1. don't ask why.
this is how the constructor is defined:
new Date(year, monthIndex [, day [, hour [, minutes [, seconds [, milliseconds]]]]]);
just go here for in-depth details about Date()

//show only if current date is after January 16, 20018
var date_to_check_with = new Date("20180116").getTime();
//.getTime() will give time in milliseconds (epoch time)
var current_date = new Date().getTime();
console.log(date_to_check_with < current_date);

Pre-populate Form Field With The Internal Millisecond Clock From Javascript

I have a form on my website that I need to pre-populate with the current unix millisecond timestamp.
I do have another form field (in the same form) which successfully pre-populates the Date (Month, Day, Year) with the following code:
<div>DATE<br><input name="date" id="date"></div>
<script>
(function() {
var days = ['','','','','','',''];
var months =
['Jan','Feb','Mar','Apr','May','June','July','Aug','Sept','Oct','Nov','Dec'];
Date.prototype.getMonthName = function() {
return months[ this.getMonth() ]; };
Date.prototype.getDayName = function() {
return days[ this.getDay() ]; }; })();
var now = new Date();
var day = now.getDayName();
var month = now.getMonthName();
document.getElementById('date').value = day + ' ' + month + ' ' +
now.getDate() + ', ' + now.getFullYear();
</script>
However... I'm not having the same luck when attempting to pre-populate a second form field with the Unix Millisecond timestamp using this code:
<div>TIMESTAMP URL<br><input name="timeStampURL" id="timeStampURL"></div>
<script>
var d = new Date();
document.getElementById('timeStampURL').innerHTML = d.getTime();
</script>
I don't understand why the two codes behave differently that way, but any advice as to how to get that script to pre-populate the field would be appreciated.

Input elements don't have any content, so setting their innerHTML property does nothing. Your first function is setting the value attribute, so should your second:
function showTimeValue() {
document.getElementById('timeValue').value = Date.now();
}
window.onload = showTimeValue;
<input id="timeValue">
<button onclick="showTimeValue()">Update time value</button>
Each time you run the code, you'll get an updated value.

Warp.js date starting from previous date

This script using warp.js works great starting from the current date. I can't seem to figure out how to get it to work starting from a previous date like Jan 2nd, 1986?
warp.js
https://github.com/mattbradley/warpjs/blob/master/README.md
Thanks!
<body>
<script src="warp.js"></script>
<div id="container"></div>
<span id="info"></span><br>
<span id="time"></span>
<span id="time2"></span>
<script>
setInterval(function() {
//specify a start date here like Jan 2 1986
Date.warp.speed(3);
var now = new Date;
//new date put out the warped start date above?
var dateD = [now.getMonth() + 1, now.getDate(), now.getFullYear()];
var dateE = [now.getHours(), now.getMinutes(), now.getSeconds()];
var MDY = dateD.join("/");
var HMS = dateE.join(":");
time.innerHTML = (MDY);
time2.innerHTML = (HMS);
}, 1000);
</script>
</body>
</html>

I figured this out. You have to use the clock() function so set your custom date, and it will then warp from that custom date.
Date.warp.clock(customDate);

Javascript: Adding days to any date

I've read through a number of topics now and have not found one quite on point.
Here's what I'm trying to do:
1) Parse a bill date that is provided in the format mm/dd/yy and is frequently not today
2) Add a variable number of days to the date. The terms are saved in the dueTime array below. I limited it to 30 days here.
3) Based on the bill date + the payment terms, calculate the date that the bill is due and return that in the mm/dd/yy format.
Here's what I've tried. The information I pass into new Date is what I expect, but the output from new date is never what I expect.
Thanks for your help.
<html>
<head>
<script>
function calculateDueTime(){
var billDate = document.getElementById('billDateId').value;
var key = document.getElementById('termsId').value;
var dueTime = new Array();
dueTime[1] = 30;
var billDate = billDate.split('/');
var newDate = new Date( parseInt( billDate[2] ) + '/' + parseInt( billDate[0] ) + '/' + ( parseInt( billDate[1] ) + parseInt( dueTime[key] ) ) );
document.getElementById('dueDateId').value = newDate.toString();
}
</script>
</head>
<body>
<input name="billDate" id="billDateId" value="5/1/11" />
Or any value in mm/dd/yy or m/d/yy format
<select name="terms" id="termsId" onchange="calculateDueTime()">
<option value="1">Net 30</option>
</select>
<input name="dueDate" id="dueDateId" />
</body>
</html>

Just add the number of days to the date:
var dt= new Date();
dt.setDate(dt.getDate() + 31);
console.log(dt);

I would suggest taking a look at Datejs (http://www.datejs.com/). I use this library quite a bit to deal with dates, which I find to be a real pain in JS.

Help with jquery datepicker calendar date disabling

I'm hoping to get some help with my problem i have been having with jquery datepicker.
Please visit this site for information regarding the problem with code samples:
http://codingforums.com/showthread.php?p=929427
Basically, i am trying to get the 1st day and day 31st working and have yet to find a way to do this. They say it may be an error within the jquery calendar.
Here is the code.
//var disabledDays = ['3-31-2010', '3-30-2010', '3-29-2010', '3-28-2010', '3-2-2010', '3-1-2010', '4-1-2010' ];
var checkDays = null;
function noWeekendsOrHolidays(date)
{
// optional: ensure that date is date-only, with no time part:
date = new Date( date.getFullYear(), date.getMonth(), date.getDate() );
// no point in checking if today is past the given data:
if ( (new Date()).getTime() > date.getTime() ) return [false,'inthepast'];
if ( checkDays == null )
{
checkDays = [];
// convert disabledDays to a more reasonable JS form:
for ( var d = 0; d < disabledDays.length; ++d )
{
var p = disabledDays[d].split("-");
checkDays[d] = new Date( parseInt(p[2]), parseInt(p[0])-1, parseInt(p[1]) );
}
}
var datetime = date.getTime();
for ( var i = 0; i < checkDays.length; i++)
{
if ( checkDays[i].getTime() == datetime ) return [false,'holiday'];
}
return [true,'']; // default CSS style when date is selectable
}
jQuery(document).ready(function() {
<%
response.write "var theSelectedDay = $.datepicker.parseDate(""y-m-d"", '" & theDate & "');" & vbcr
%>
jQuery('#datepicker2').datepicker({
dateFormat: 'yy-mm-dd',
constrainInput: true,
firstDay: 1,
defaultDate: theSelectedDay,
beforeShowDay: noWeekendsOrHolidays,
onSelect: function(date) {
endDate = date;
startDate = theSelectedDay;
}
});
});
The theSelectedDay is formatted like ['2010-3-1']
I have set the clock back on my computer in order to test this out. It's set on March 1st.
I have a big calendar on the main page and when the user clicks on a day it pops up this datepicker. Like i said, it all works fine for days 2-30 but not for day 1 and 31.
If they choose day 2 (and it was march 2nd) then Monday would not be selectable of course since its a past day.
Hope that helps.

You mean valueOf(), not getTime().