Develop Reference

Tricky date string to parse in JavaScript

Fri Nov 10 05:45:36 +0000 2017
I've tried both moment and chrono-node. Both are getting stumped by this date format.
Any suggestions to get a valid UTC date?
Thanks

To add to #CertainPerformance's answer, the problem with your code, if you try with MomentJS is that it is not a standard ISO date string. Parsing it directly without specifying format will result in incorrect result and a warning like this:
Deprecation warning: value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are discouraged and will be removed in an upcoming major release.
To mitigate, always pass the format to MomentJS constructor like this:
const inputStr = "Fri Nov 10 05:45:36 +0000 2017"
const mom = moment(inputStr, 'ddd MMM D HH:mm:ss ZZ YYYY');
console.log(mom.toISOString());
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.1/moment.min.js"></script>

I think this should help you out:
var date = new Date("Fri Nov 10 05:45:36 +0000 2017").toISOString();
date = date.split("T")[0];
console.log(date);

Moment works just fine:
const inputStr = "Fri Nov 10 05:45:36 +0000 2017"
const mom = moment(inputStr, 'ddd MMM D HH:mm:ss ZZ YYYY');
console.log(mom.toISOString());
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.1/moment.min.js"></script>

You can see the difference between 2 items of each array which is returned by the code that I have written to process the date strings of the form you have provided.
Finally you can have a look at the full code example given.
In first case, both are same.
In second case, both are different.
console.log(dateArr1); // [ '2017-11-10', '2017-11-10' ];
console.log(dateArr2); // [ '2018-05-15', '2018-05-14' ];
So it's clear our UTC conversion is working fine.
Please have a look at the below code example and try to understand. It is simple.
Note» All the comments inside function are for inputDateStr: "Fri Nov 10 05:45:36 +0000 2017"
// All the comments inside function are for
// inputDateStr: "Fri Nov 10 05:45:36 +0000 2017"
function getMyUTCDate(inputDateStr)
{
var inputDateString = inputDateStr;
var date = new Date(inputDateString);
var dateArr = []; // To store 2 dates, simple one & full UTC one
console.log(date); // 2017-11-10T05:45:36.000Z
// ............... SIMPLE EXAMPLE ..........................
var year = date.getFullYear();
var month = date.getMonth();
var day = date.getDate();
var hours = date.getHours();
var minutes = date.getMinutes()
var seconds = date.getSeconds();
console.log(year); // 2017
console.log(month); // 10
console.log(day); // 10
console.log(hours); // 11
console.log(minutes); // 15
console.log(seconds); // 36
utcDate = new Date(Date.UTC(year, month, day, hours, minutes, seconds));
utcDateString = utcDate.toUTCString();
console.log(utcDate); // 2017-11-10T11:15:36.000Z
console.log(utcDateString); // Fri, 10 Nov 2017 11:15:36 GMT
var dt1 = utcDate.toISOString().split('T')[0]
dateArr.push(dt1)
console.log(dt1); // 2017-11-10
// .................. FULL UTC EXAMPLE ..........................
var utcYear = date.getUTCFullYear();
var utcMonth = date.getUTCMonth();
var utcDay = date.getUTCDate();
var utcHours = date.getUTCHours();
var utcMinutes = date.getUTCMinutes()
var utcSeconds = date.getUTCSeconds();
console.log(utcYear); // 2017
console.log(utcMonth); // 10
console.log(utcDay); // 10
console.log(utcHours); // 5
console.log(utcMinutes);// 45
console.log(utcSeconds);// 36
var utcDate2 = new Date(Date.UTC(utcYear, utcMonth, utcDay, utcHours, utcMinutes, utcSeconds));
var utcDateString2 = utcDate2.toUTCString();
console.log(utcDate2); // 2017-11-10T05:45:36.000Z
console.log(utcDateString2); // Fri, 10 Nov 2017 05:45:36 GMT
// Get UTC Date
var dt2 = utcDate2.toISOString().split('T')[0]
dateArr.push(dt2)
console.log(dt2); // 2017-11-10
return dateArr;
}
// Inputs
var inputDateString1 = "Fri Nov 10 05:45:36 +0000 2017";
var inputDateString2 = "Mon May 14 23:59:36 +0000 2018";
var dateArr1 = getMyUTCDate(inputDateString1);
var dateArr2 = getMyUTCDate(inputDateString2);
// Print dates
console.log(dateArr1); // [ '2017-11-10', '2017-11-10' ]
console.log(dateArr2); // [ '2018-05-15', '2018-05-14' ]
References
developer.mozilla.org - Date processing functions
Thanks.

Javascript Converting Ints to Time?

For a project app I'm making, a homework keeper, I need to be able to turn a number like 10 into a month like october, then do this with year, month, day, and time. Then I need to save it all in a date. How do I do this? I have been looking everywhere and cannot find how to do it.

It looks like you're looking for the Date() constructor.
var month = 10;
var day = 17;
var year = 2017;
var hour = 8;//Use the 24 hour clock for times in the PM
var minutes = 36;
var date = new Date(year, month-1, day, hour, minutes);//Outputs October 17th, 2017 at 8:36am in your local timezone
You have to subtract 1 from the month because January starts at 0, not 1.
Alternatively, I like to use moment.js for the flexibility depending on use, so you could instantiate it like this:
var date = moment(year + '-' + month + '-' + day + ' ' + hour + ':' + minutes, 'YYYY-M-D H:m');//Because you are using numbers/integers, none of them will have preceding zeroes

Take a look at the Date constructor - I think it doesn everything you need.
Your biggest gotcha is that months are 0-indexed so you'll actually turn 9 into October. Also beware that if you don't initialise Date with anything, it'll assume you mean now.
var date = new Date();
date; // -> Tue Oct 17 2017 13:34:49 GMT+0100 (GMT Daylight Time)
date.setMonth(10); // -> 1510925689970
date; // -> Fri Nov 17 2017 13:34:49 GMT+0000 (GMT Standard Time)

How To add number of month into the given date in javascript?

I want to add month into the select date by the user.
startdate=document.getElementById("jscal_field_coverstartdate").value;
now I want to add 11 month from the above startdate. How to do that.
date format = 2013-12-01

Without the date format it is difficult to tell, however you can try like this
add11Months = function (date) {
var splitDate = date.split("-");
var newDate = new Date(splitDate[0], splitDate[1] - 1, splitDate[2]);
newDate.setMonth(newDate.getMonth() + 11);
splitDate[2] = newDate.getDate();
splitDate[1] = newDate.getMonth() + 1;
splitDate[0] = newDate.getFullYear();
return startdate = splitDate.join("-");
}
var startdate = add11Months("2013-12-01");
alert(startdate)
JSFiddle

If your startdate is in correct date format you can try using moment.js or Date object in javascript.
In Javascript, it can be achieved as follow:
var date = new Date("2013-12-01");
console.log(date);
//output: Sun Dec 01 2013 05:30:00 GMT+0530 (India Standard Time)
var newdate = date.setDate(date.getDate()+(11*30));
console.log(new Date(newdate));
// output: Mon Oct 27 2014 05:30:00 GMT+0530 (India Standard Time)
In above lines, I have used 30 days per month as default. So you will get exact 11 month but little deviation in date. Is this what you want ? You can play around this likewise. I hope it help :)
For more about Date you can visit to MDN.

You can do it like this:
var noOfMonths = 11
var startdate = document.getElementById("jscal_field_coverstartdate").value;
startdate.setMonth(startdate.getMonth() + noOfMonths)

Try this:
baseDate.setMonth(2);
baseDate.setDate(30);
noMonths = 11;
var sum = new Date(new Date(baseDate.getTime()).setMonth(baseDate.getMonth() + noMonths);
if (sum.getDate() < baseDate.getDate()) { sum.setDate(0); }
var m = newDate.getDate();
var d = newDate.getMonth() + 1;
var yyyy = newDate.getFullYear();
return (yyyy+"-"+m+"-"+d);
Notes:
Adding months (like adding one month to January 31st) can overflow the days field and cause the month to increment (in this case you get a date in March). If you want to add months and then overflow the date then .setMonth(base_date.getMonth()+noMonths) works but that's rarely what people think of when they talk about incrementing months.
It handles cases where 29, 30 or 31 turned into 1, 2, or 3 by eliminating the overflow
Day of Month is NOT zero-indexed so .setDate(0) is last day of prior month.

Javascript DATE add AM PM

I am doing a check of two different date times to see if one is greater than the other:
Here is my (now) current date time: Thu Aug 01 2013 10:27:40 GMT-0500 (CDT)
And here is my date time that I am seeing if it is greater or less than: Thu Aug 01 2013 12:15:00 GMT-0500 (CDT) - (that should be 12:15 am by the way)
Here is my code:
var current_date_time = new Date();
var date_time_checking_against = new Date(date_segment[0], date_segment[1]-1, date_segment[2], time_segment[0], time_segment[1]);
Which comes out to Thu Aug 01 2013 12:15:00 GMT-0500 (CDT). And then I am doing a simple if check:
if(current_date_time >= date_time_checking_against){ }
This is not working as 10:27:40 is not after 12:15:00. But it should be, seeing as how both times are AM. I need to know if this is the right way, or if there is a way to change it to 24 hour format or add am pm in there somehow. Any help is greatly appreciated, let me know if you need more clarity.
Thanks!
EDIT:
Here is the date time array:
var date_time_str = date+' '+time;
date_time_str = date_time_str.split(' ');
["2013-08-01", "12:15", "am"] // result from split above
var date_segment = date_time_str[0].split('-');
var time_segment = date_time_str[1].split(':');
var date_time_checking_against = new Date(date_segment[0], date_segment[1]-1, date_segment[2], time_segment[0], time_segment[1]);

Given the following data sources, this is how you'd properly create the Date object for it...
date_time_str = ["2013-08-01", "12:15", "am"];
var date_segment = date_time_str[0].split('-');
var time_segment = date_time_str[1].split(':');
var date_time_checking_against = new Date(
date_segment[0], // year
date_segment[1]-1, // month of year
date_segment[2], // day of month
(time_segment[0]%12) + (date_time_str[2] == 'pm' ? 12 : 0), // hour of day
time_segment[1]); // minute of hour
console.log(new Date() >= date_time_checking_against); // true, we've already passed this time

Getting current time from the date object

function formatDate (input) {
var datePart = input.match(/\d+/g),
year = datePart[0].substring(2), // get only two digits
month = datePart[1], day = datePart[2];
document.write(new Date(day+'/'+month+'/'+year));
}
formatDate ('2010/01/18');
When i print this i get Thu Jun 01 1911 00:00:00 GMT+0530 (India Standard Time) but the system is actually 3:42 P.M

Use the current date to retrieve the time and include that in the new date. For example:
var now = new Date,
timenow = [now.getHours(),now.getMinutes(),now.getSeconds()].join(':'),
dat = new Date('2011/11/30 '+timenow);

you must give the time:
//Fri Nov 11 2011 00:00:00 GMT+0800 (中国标准时间)
alert(new Date("11/11/11"));
//Fri Nov 11 2011 23:23:00 GMT+0800 (中国标准时间)
alert(new Date("11/11/11 23:23"));

What do you want? Just the time? Or do you want to define a format? Cu's the code expects this format for date: dd/mm/yyyy, changed this to yyyy/mm/dd
Try this:
function formatDate (input) {
var datePart = input.match(/\d+/g),
year = datePart[0],
month = datePart[1], day = datePart[2],
now = new Date;
document.write(new Date(year+'/'+month+'/'+day+" " + now.getHours() +':'+now.getMinutes() +':'+now.getSeconds()));
}
formatDate ('2010/01/18')
Output:
Mon Jan 18 2010 11:26:21 GMT+0100

Passing a string to the Date constructor is unnecessarily complicated. Just pass the values in as follows:
new Date(parseInt(year, 10), parseInt(month, 10), parseInt(day, 10))
You're creating a Date() object with no time specified, so it's coming out as midnight. if you want to add the current date and time, create a new Date with no arguments and borrow the time from it:
var now = new Date();
var myDate = new Date(parseInt(year, 10), parseInt(month, 10), parseInt(day, 10),
now.getHours(), now.getMinutes(), now.getSeconds())
No need to strip the last two characters off the year. "2010" is a perfectly good year.