Develop Reference

Do something when time is above the set time

I am just a newbie. I am trying delete a span when the time is above 6:30 pm daily. Code below:
(function(){
var d = new Date();
d.setHours(18,30,0);
if (d<new Date().toLocaleString());{
$("span:contains('Material Receive')").remove()
return false;}})();
However it s not working. It is always removing, i.e 24x7.

getHours Method will fit perfect i think
var d = new Date();
if (1830 < d.getHours()+""+d.getMinutes()){
$("span:contains('Material Receive')").remove()
return false;
}

Try to not compare an object with a string. Use 2 numbers instead. And lose the stray semicolon.
if (d.getTime() < new Date().getTime()){...}

Above answers already explained for you. Anyway:
Getting current date and time in JavaScript
I didn't understand exactly what you want to do, I suppose to delete a span every day at 18:30, right?
In this case, when you create the date object, you have to access hours and minutes to check time so:
( function() {
var d = new Date();
if( ( d.getHours() == 18 ) && ( d.getMinutes() == 30 ) ) {
$("span:contains('Material Receive')").remove();
return false; //Useless in a self-invoking function
}
})();

How to get the Australian Time Zone using Javascript? (Not JQuery)

I am trying to help a friend to get the Australian Time Zone for the University Assignment and finding difficulty.
Could someone point us in the right direction?
Thank you!
<script>
function Timezone() {
var x = new Date();
var currentTimeZoneOffsetInHours = x.getTimezoneOffset() / 60;
document.getElementById("add").innerHTML = currentTimeZoneOffsetInHours;
}
</script>
<p id="add"></p>

You simply use
let AuDate = new Date().toLocaleString("en-US", {timeZone: "Australia/Sydney"});

By looking at your code, looks like you are trying to get the current date and time of an Australian timezone. Lets say you want Australian Eastern Standard Time (AEST) and you want the date displayed how they would in Australia DD-MM-YYYY then do the following:
var timestamp_UTC = new Date();
var readable_timestamp_AEST = timestamp_UTC.toLocaleDateString("en-AU", {timeZone: "Australia/Sydney"}).replace(/\//g, "-") + ' ' + somestamp.toLocaleTimeString("en-AU", {timeZone: "Australia/Sydney"});
"en-AU" is the locales argument which tells the toLocalDateString to display the date as DD-MM-YYYY and the second argument is for options (timeZone is just one such possible option). Info about toLocalDateString function can be found here https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString
Here is some information about the Date() function https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
Hope this clears up a few things around getting times and dates from the Date() function.

I think i understand what you mean. But before that i'd like to make 2 points:
1: The Timezone() function should be called somewhere.
<script>
function Timezone() {
var x = new Date();
var currentTimeZoneOffsetInHours = x.getTimezoneOffset() / 60;
document.getElementById("add").innerHTML = currentTimeZoneOffsetInHours;
}
Timezone();
</script>
2: The convention usually is that methods start with a lower case letter. Maybe updateTimezone() would be more appropriate.
Your question can be interpreted in 2 ways now:
you want your timezone's offset in hours and for this the code above should work. getTimezoneOffset() is the way to go.
you want a human readable name of your timezone, as you can see on my site currentmillis.com (in my case it says GTB Summer). You can look in my source code to see how i achieve this:
var s = date.toString();
var iOfP = s.indexOf('('); // index of parenthesis
if (iOfP < 0) {
s = s.substring(s.lastIndexOf(' ') + 1);
} else {
s = s.substring(iOfP+1, s.length-1);
}
if (s.length > 4 && s.lastIndexOf(" Time") == s.length-5){
s = s.substring(0, s.length-5);
}
timezoneM.innerHTML = s;
This works because when you call toString() on the date the result should contain the full name of your timezone: w3schools.com/jsref/jsref_tostring_date.asp

Get days left till end of the month with moment.js

I want to display or hide a link depending on whether there are less than 2 weeks left in the month, using moment.js, but I'm not sure the correct way to go about it.
Currently I have...
if (moment().endOf('month')<=(13, 'days'))
{
//do link stuff here
}
...but I don't think that's the correct way of doing it. It certainly isn't doing anything anyway. Could anyone give me any pointers? Thanks in advance.

You could do something like this:
var a = moment().endOf('month');
var b = moment();
if(a.diff(b, 'days') <= 13)
{
//do something
}

If you're looking for a plain javascript version, I've wrote this function:
function getMonthDaysLeft(){
date = new Date();
return new Date(date.getFullYear(), date.getMonth() + 1, 0).getDate() - date.getDate();
}

Maybe something like this can help.
const d = moment();
const currentDay = d.get("date");
const daysInMonth = d.daysInMonth();
const remainingDays = daysInMonth - currentDay;
console.log(remainingDays <= 13)

NaN javascript error when calculating between dates with timestamp

I would like to begin by saying i looked at multiple threads in this forum before posting. Wasnt able to find my solution :(
Issue: getting a NaN error when trying to find the difference between two dates with a timestamp from two textboxes.
The date format i'm using is DDMMYYYY HH:MM - 27/01/2015 00:00
code below.
thank you in advance for this super helpful forum :)
function stringToDate(s) {
var dateParts = s.split(' ')[0].split('-');
var timeParts = s.split(' ')[1].split(':');
var d = new Date(dateParts[0], --dateParts[1], dateParts[2]);
d.setHours(timeParts[0], timeParts[1], timeParts[2]);
return d;
}
function test() {
var a = textbox_1.value;
var b = textbox_2.value;
alert(stringToDate(a) - stringToDate(b));
}

Your date has / as separator but you are splitting the string on -. Change
var dateParts = s.split(' ')[0].split('-');
to
var dateParts = s.split(' ')[0].split('/');
Also, your time part has only hours and minutes, so there is no timeParts[2] present, just remove it from the setHours() call. Like this:
d.setHours(timeParts[0], timeParts[1])
Fiddle: http://jsfiddle.net/2evj59d1/
EDIT
Your code returns the difference in milliseconds. To convert it into date format just change
alert(stringToDate(a) - stringToDate(b));
to
alert(new Date(stringToDate(a) - stringToDate(b)));

The code is trying to parse a time in the format HH:MM:SS. Skip the third part:
d.setHours(timeParts[0], timeParts[1]);

You can convert the date into milliseconds, get the difference and get the date back.
Fiddle
JSCode:
var a = new Date();
a.setDate(15);
a = a.getTime();
var b = new Date();
b.setDate(32);
b = b.getTime();
var c = b - a;
var date = new Date(c);
alert(date.getDate() - 1);

for those who may have stumbled upon my post, i found my answer at the link below by user benjour.
How do I get the difference between two Dates in JavaScript?

creating date from a timestring in javascript

I am new to javascript and am trying to compare two date values ,I am getting two time value strings in the format
06:30:47 AM
01:10:47 PM
I need to compare these to find out if the first one is less than the other.I couldn't figure out how to do this in javascript.Can someone help?
o.h

I do not think that the standard implementation can parse this. I would do something like this:
function toDate(dateString) {
var timeComponents = dateString.replace(/\s.*$/, '').split(':');
if (dateString.indexOf("PM") > -1) {
timeComponents[0] += 12;
}
var date = new Date();
date.setHours(timeComponents[0]);
date.setMinutes(timeComponents[1]);
date.setSeconds(timeComponents[2]);
return date;
}
if (toDate('06:30:47 AM') > toDate('01:10:47 PM')) {
// ...
}

JavaScript's specified date/time parsing, what you can rely upon cross-browser, is surprisingly limited. For a long time, there was no single string date format that was mandated in the spec, and as of the recent 5th edition spec, the only mandated format is ISO-8601 (and some subsets). You can't yet rely on browsers having implemented that part of the 5th edition spec.
So you have a couple of choices:
Parse the string yourself and use the Date constructor that takes the individual parts of the date as numbers, e.g. new Date(year, month, day, hour, minute, second, ...). (You need only specify as many of those as you want, so for instance new Date(2010, 9, 14) is September 14th, 2010.)
Use a library like Moment that's already done the work for you. Moment lets you specify the format to parse.

Use the Date object. Check this: http://www.w3schools.com/jsref/jsref_obj_date.asp
Try putting the two values in Date variables and do this:
if(var1.valueOf() > var2.valueOf())
{
//Do Something
}

If your times are always in the format 00:00:00 AM then
var a="06:30:47 AM";
var b="01:10:47 PM";
var at=parseInt(a.substring(0,8).replace(/(^0+|:)/g,""));
var bt=parseInt(b.substring(0,8).replace(/(^0+|:)/g,""));
if (a.charAt(9)=="P") {at=at+120000};
if (b.charAt(9)=="P") {bt=bt+120000};
if (at<bt) {
// a is smaller
}
else
{
// a is not smaller
};
..should be cross-browser and time/format safe.

I tried something like this
var ts1="06:30:47 AM";
var ts2="01:10:47 PM";
var ds=new Date().toDateString();
var d1=new Date(ds+" "+ts1);
var d2=new Date(ds+" "+ts2);
if (!(d2>d1)){
alert("d1 should be less than d2");
}
Is there something wrong with this?

// specific formatter for the time format ##:##:## #M
var formatToMiliseconds = function(t){
t = t.split(/[:\s]/);
t = ((t[0] * 3600000) + (t[1] * 60000) * (t[2] * 1000)); // To ms
t = t + (/PM/i.test(t[3]) ? 43200000 : 0); // adjust for AM/PM
return t;
}
var time01 = formatToMiliseconds('06:30:47 AM');
var time02 = formatToMiliseconds('01:10:47 PM');
alert(time01 > time02); // false
allert(time01 < time02); // true
As a bonus, your time is now more compatible with the Date object and other time calculations.