Develop Reference

Javascript date not properly converting to local time

I have a string called stringDate that is equal to 2023-01-20T04:48:42.327000 which is a string. This is in UTC time. I live in the Pacific timezone so the following code should return 2023-01-19T20:48:42.327Z but it's returning 2023-01-20T12:48:42.327Z. Why is this happening?
let date: any = new Date(stringDate);
console.log(date);

To force new Date() to parse a date time object as UTC you can append a zero time zone offset to it.
let date: any = new Date(stringDate + '+00:00');

The issue is most likely due to the fact that JavaScript's Date object assumes that the input string is in local time, not UTC. This means that the Date object is automatically converting the input string to the local time zone.
So using .toISOString() method, which will return a string in ISO format, including the UTC offset (represented by 'Z' at the end):
let date: any = new Date(stringDate);
console.log(date.toISOString());
This will correctly parse the input string as UTC time and output the expected result 2023-01-19T20:48:42.327Z.

Converting a DateTime Object to a specific timezone

I have a dateTime string "2019-02-14 17:18:22".
I would like to convert this above-mentioned dateTime string to a specific timezone dateTime .
Here the timezone will be extracted from another dateTime string - "2019-02-14T17:28:24+08:00".
I did look up at the utcOffset function but I don't know how to use the offset value (330 in mycase).
Expected result: The first String is fairly simple 5:18 PM .
But once getting converted to the specific timezone, it will be 2:48 PM.

Heres how I use timezone offsets.
I get DateTimeIn, which is offset to (UTC+00:00) from the server.
Then to convert to the browser's timezone (UTC-05:00), i use: getTimezoneOffset() to update the object to the local timezone.
var dateObj = new Date(DateTimeIn);
dateObj.setMinutes(dateObj.getMinutes() + dateObj.getTimezoneOffset());
Without this, my server downloaded datetimes are offset and unusable.

How to get date from js in correct format? Month and days get reversed

I am calling an ajax for getting some values for editing data.
As a part of my object, I am sending the date field.
My problem is that when I receive the date value in the controller, date format is wrong - my dates and months are reversed. And because of that I can't compare them where I need to.
But my months and days are reversed. For an example , instead of 3rd October, it returnes 10th of March.
How to fix this?
I am sending the date field from js in a object like this:
ExamsDataU = {
classId: classIdValue,
date: dateValue
};
And in my controller I tried:
DateTime dateToCheck = Convert.ToDateTime(dto.Date);

The first thing you should know is date parsing with Convert.ToDateTime() depends to the current culture used in server (you may check it using CultureInfo.CurrentCulture property). You can try one of these methods to parse JS date format properly inside controller action method:
1) Using DateTime.ParseExact()/DateTime.TryParseExact() with custom format
On this way it is necessary to specify date format before parsing date:
// specify custom format
string dateFormat = "dd-MM-yyyy";
DateTime dateToCheck = DateTime.ParseExact(dto.Date, dateFormat, CultureInfo.InvariantCulture);
2) Using DateTime.ParseExact()/DateTime.TryParseExact() with ISO 8601 format
Use date: dateValue.toISOString(); to convert JS date into ISO 8601 format and then convert it:
// specify ISO format
string dateFormat = "yyyy-MM-ddTHH:mm:ss.fffZ";
DateTime dateToCheck = DateTime.ParseExact(dto.Date, dateFormat, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind);
This way is better than the former because no need to write additional date representation code in client-side, also you can adjust date representation to local time if necessary.
Notes:
a) For specified culture, you can try CultureInfo.GetCultureInfo():
var culture = CultureInfo.GetCultureInfo(CultureInfo.CurrentCulture.Name);
DateTime dateToCheck = DateTime.ParseExact(dto.Date, dateFormat, culture);
b) You can use if condition to check if the date string is valid when using DateTime.TryParseExact():
DateTime dateToCheck;
if (DateTime.TryParseExact(dto.Date, dateFormat, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateToCheck))
{
// do something
}

Try this
var date = new Date('2014-01-06');
var newDate = date.toString('dd-MM-yy');
or
var dateAr = '2014-01-06'.split('-');
var newDate = dateAr[1] + '-' + dateAr[2] + '-' + dateAr[0].slice(-2);
console.log(newDate);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

How to convert date time string in formatted date time in extjs

I have a string of Date and Time ("2017-11-29 11:08:43" YYYY-MM-DD hh:mm:ss) like this. I want to convert it into "29-11 11:08"(DD-MM hh:mm) format.
I tried it using below code. But not get any success. have you any solution?
convert: function (idleFrom) {
var date = Ext.Date.parse(idleFrom, "Y-m-d");
return date;
}

first change your string into date format using
var dt = new Date(idleFrom)
than change into you required format using
Ext.Date.format(dt, 'm/d/Y');
follw this link for more format
Hope it will work :)

If you have a string, and want it reformatted, you have to parse the string into a JS date object first, and then format the JS date object into the string representation you need:
var date = Ext.Date.parse("2017-11-29 11:08:43", "Y-m-d H:i:s")
var str = Ext.Date.format(date, "m/d/Y")
Please note that Ext.Date.parse is really picky regarding the format identifier. If the matching between the format identifier and the input string's format is not 100%, your date will be null.
E.g. Ext.Date.parse("2017-11-29 11:08:43", "Y-m-d H:i") will be null because the seconds are in the date string, but missing from the format identifier.

.NET WebService JSON date in ISO-8601 format

I am calling a .net asmx webservice that returns a number of fields. One of the fields in a date. The date is in the format of: "effective_date":"\/Date(978411600000)\/"
According to this SO question: How do I format a Microsoft JSON date? it would be better if the date returned was in ISO 8601 format, this way JavaScript would be able to interpret it as a date.
Currently I use the following javascript: new Date(d.effective_date) and I get the message Invalid Date. According to the linked SO question I should be able to do this if I can get the web service to pass the date in ISO format rather than in \/Date(978411600000)\/ format.
My question is, how do I get the webservice to return the date in ISO 8601 format?
Note:
I'm aware that I can use this (per the answer from the linked question): var date = new Date(parseInt(d.effective_date.substr(6)));, however it is mentioned in a comment that Incoming date values should be formatted in ISO-8601, so I'm wondering how to get the incoming date from the web service to be in this ISO format.

You may use:
var date = new Date(d.effective_date);
date.toISOString(); // ISO-8601 formatted string
JSFiddle: http://jsfiddle.net/nanndoj/gjtkvrsy/