Develop Reference

How can I convert this string "07/10/2017 18:30 PM" to JavaScript Date type

I am trying to read all dates in a table and see if those dates are old dates than current date time and if those are old dates then highlight those dates with some color.
Here is my Javascript code
$(".ticket-gird-td-duedate").each(function(i, e) {
debugger;
var dueDateAsString = $(e).text();
console.log(dueDateAsString);
var dueDate = new Date(dueDateAsString);
var currentdate = new Date();
if (dueDate < currentdate) {
//mark date in red color
console.log("I need to change color for this date as this is past date" + dueDate);
}
});
Problem here is dueDateAsString comes as "07/10/2017 18:30 PM"
And when I am doing
new Date("07/10/2017 18:30 PM")
it fails with invalid date error
Invalid Date
How can I convert my string date to Javascript date and proceed to compare it with current date?

That isn't a valid date, as you either have 24hr format or AM|PM 12hr format.
This works:
new Date('07/10/2017 18:30'); // No 'PM' after the 24hr time
Also note that JS dates are mutable, so todayDate and check will hold the same date value, but check will be a number.

You call this one first
todayDate.setDate(todayDate.getDate() - 5);
It will update todayDate to 5 days ago. Then you just assign it to check or you todayDate further.
var check = todayDate;
Hope this helps.

You can do this by using moment.js library (yet another terrific way to achieve date parsing).
Moment.Js library is freely available. You can use either a minified or full version of this library as you require. In this
library all the operations are performed on a moment object so the
date or time is stored in this library as a moment object only. So
this moment object is the core of this entire library. You can find
this library at Moment.js site's home page.
Add momentjs library reference into your project - https://momentjs.com/downloads/moment.js
updated code with moment.js would be:
var todayDate = new moment().format("MM/DD/YYYY h:mm:ss a");
var yesterday = todayDate.toLocaleString();
var check = moment(todayDate, "MM/DD/YYYY h:mm:ss a").add('days', -5);
alert("Your Old Date is- " + todayDate);
alert(check);
alert("Your Old Date is- " + yesterday);
JavaScript fiddle

Time Calculator Incorrect Date Format

A kind soul gave me the following script a while back to calculate future dates while excluding weekends. It works like a charm, however on certain systems it displays the incorrect date format.
I'd like it to display the date in dd/mm/yyyy, however on some of my colleagues pc's its showing m/d/yyyy.
I've checked their Time and date settings and they're all correct.
It would really help if someone were able to help force this format by adding into the following script as I'm not Javascript coder by any means :(
<script>
var myDelayInDays=8, myDate=new Date();
myDate.setDate(myDate.getDate()+myDelayInDays);
if(myDate.getDay() == 0){//Sunday
myDate.setDate(myDate.getDate() + 2);//Tuesday
}
else if(myDate.getDay() == 6){//Saturday
myDate.setDate(myDate.getDate() + 2);//Monday
}
document.write('' + myDate.toLocaleDateString());
</script>
Thanks

The toLocaleDateString will print the date in default format based on the user browser.
But you can specify the particular format by specifying the locale.
The en-GB locale will print the date in dd/mm/yyyy
<script>
var myDelayInDays=8, myDate=new Date();
myDate.setDate(myDate.getDate()+myDelayInDays);
if(myDate.getDay() == 0){//Sunday
myDate.setDate(myDate.getDate() + 2);//Tuesday
}
else if(myDate.getDay() == 6){//Saturday
myDate.setDate(myDate.getDate() + 2);//Monday
}
document.write('' + myDate.toLocaleDateString('en-GB'));
</script>
Refer this for more details.

Instead of
document.write('' + myDate.toLocaleDateString());
use
var myDate=new Date(myDate);
var dateString=date.getDate()+'/'+(date.getMonth()+1)+'/'+(date.getFullYear());
document.write(dateString);
Since LocalDateString will differ for each machine

Getting next day date for specific string format in Google Apps Script (JavaScript)

Good day everyone!
Working on aprojectmI had to start working with Google Spereadsheet interface and faced a problem I cannot quickly overcome due to not working with JavaScripts ever before.
I have a date in specific format as a string
var date = "2012-08-09";
What I need is to get the next day date as
date = "2012-08-10";
which should include changing not only the day, but month and year too, if necessary.
I've tried using date format
var datum= new Date(date);
datum.setDate(datum.getDate() + 1);
date = datum.toString('yyyy-MM-dd');
but the code appears to fail at writing date to datum variable.
What is the best and quickiest way tosolve this litle problem?
Thanks

The problem when you tag a question 'Javascript' and when you are actually using Google Apps Script is that you get nice answers from people that do not know some special functions available in GAS.
GAS is based on Javascript but Javascript is not GAS... if you see what I mean ;-)
That said, there is actually a "special" function to format date string and I'll show it in the following code.
But there is also another point that could put you into trouble : if you don't mention hours in your date object there is a risk to shift one day if you live in a country that uses daylight savings. This issue has been discussed quite often on this forum and elsewhere so I won't give all the details but it's a good idea to take this into account when you play with date objects. In the code below I extract a tz (time zone) string from the date object we have just created to know if it's in summer or in winter time, then I use this tz string as a parameter in the Utilities.formatDate() method . This guarantees an exact result in every situations.
Here is (finally) the test code :
(use the logger to see results. script editor>view>logs)
function test(){
date = "2012-08-9";
var parts = date.split('-')
var datum = new Date(parts[0],parts[1]-1,parts[2],0,0,0,0);// set hours, min, sec & milliSec to 0
var tz = new Date(datum).toString().substr(25,8);// get the tz string
Logger.log(datum+' in TimeZone '+tz)
datum.setDate(datum.getDate() + 1);// add 1 day
var dateString = Utilities.formatDate(datum,tz,'yyyy-MMM-dd');// show result like you want, see doc for details
Logger.log(dateString);// the day after !
}
Logger results :
Thu Aug 09 2012 00:00:00 GMT+0200 (CEST) in TimeZone GMT+0200
2012-Aug-10

It sounds like a parsing problem you may have better luck, splitting out the date and putting the parameters in individually, any errors you get would be useful:-
var parts = date.split("-");
var datum = new Date(
parseInt(parts[0], 10),
parseInt(parts[1], 10) - 1,
parseInt(parts[2], 10));
There is no built in formatting function for the JavaScript Date object, I'm not sure if the google apps api is any different though. To perform the last line of your code you may either need to write your own functions to extract the data from the JavaScript date object and format it, hint you will also need to write a zerofill function if you want to ensure two digits in your date and month parts of the output.
var formatted = datum.getFullYear() + "-" +
zerofill(datum.getMonth() + 1, 2) + "-" +
zerofill(datum.getDate(), 2);

Passing a format string to toString works in .NET, and it may work in Java, however this doesn't work in Javascript.
Try the following,
var date = "2012-08-09";
var datum = new Date(date);
datum.setDate(datum.getDate() + 1);
date = datum.getFullYear() + "-" + (datum.getMonth() + 1) + "-" + datum.getDate();

Try the following in http://jsfiddle.net/ It works.....
<html>
<head>
<script>
function foo(){
var date = "2012-08-09";
var datum = new Date(date);
datum.setDate(datum.getDate() + 1);
date = datum.getFullYear() + "-" + (datum.getMonth() + 1) + "-" + datum.getDate();
document.getElementById("demo").innerHTML = date;
}
</script>
</head>
<body onload="foo()">
<p id=demo></p>
</body>
</html>​

Javascript next and previous day function

I am developing a daily calendar and need to traverse to the next and previous day. How would I write this in javascript? Will the following calculate correctly when going to the next / previous month? Like C#'s DateTime.Today.AddDays(1) will?
new Date(year, month, day + 1)
My concern is that if I execute this on March 31st, it will calculate March 32nd...which wouldn't work obviously.
If someone could provide a function to do both that would be great!
Thanks in advance!

var dateString = '30 Apr 2010'; // date string
var actualDate = new Date(dateString); // convert to actual date
var newDate = new Date(actualDate.getFullYear(), actualDate.getMonth(), actualDate.getDate()+1); // create new increased date

You don't need to worry. It won't.
date = new Date(2012, 2, 31 + 1);
console.log(date);

Formatting the Date in JavaScript

Using newDate() function in Java script, I am able to get today's date. I am getting the date in the format 3/3/2009 (d/m/yyyy). But i actually need the date in the format 2009-03-03 (yyyy-mm-dd). Can anyone pls let me know how to format the date as i require?

You usually have to write your own function to handle the formatting of the date as javascript doesn't include nice methods to format dates in user defined ways. You can find some nice pieces of code on the net as this has been done to death, try this:
http://blog.stevenlevithan.com/archives/date-time-format
Edit: The above code seems to be really nice, and installs a cool 'format' method via the date object's prototype. I would use that one.

If you want to roll-your-own, which is not too difficult, you can use the built-in javascript Date Object methods.
For example, to get the current date in the format you want, you could do:
var myDate = new Date();
var dateStr = myDate.getFullYear +
'-' + (myDate.getMonth()+1) + '-' + myDate.getDate();
You may need to zero-pad the getDate() method if you require the two-digit format on the day.
I create a few useful js functions for date conversions and use those in my applications.

There's a very nice library to manage date in JS.
Try this.

You'll pretty much have to format it yourself, yeah.
var curDate = new Date();
var year = curDate.getFullYear();
var month = curDate.getMonth() + 1;
var date = curDate.getDate();
if (month < 10) month = "0" + month;
if (date < 10) date = "0" + date;
var dateString = year + "-" + month + "-" + date;
It's a bit long, but it'll work (:

add jquery ui plugin in your page.
function DateFormate(dateFormate, dateTime) {
return $.datepicker.formatDate(dateFormate, dateTime);
};

Just another option, which I wrote:
DP_DateExtensions Library
Not sure if it'll help, but I've found it useful in several projects.
Supports date/time formatting, date math (add/subtract date parts), date compare, date parsing, etc. It's liberally open sourced.
No reason to consider it if you're already using a framework (they're all capable), but if you just need to quickly add date manipulation to a project give it a chance.