JavaScript convert date to format - javascript

I'm trying to truncate a JavaScript Date object string from:
Wed Aug 01 2012 06:00:00 GMT-0700 (Pacific Daylight Time)
to
Wed Aug 01 2012
(I'm not particular, could be of format MM/DD/YYYY for example, as long as I get rid of the time/timezone)
Essentially I just want to get rid of the time and the timezone because I need to do a === comparison with another date (that doesn't include the time or timezone)
I've tried using this http://www.mattkruse.com/javascript/date/index.html but it was to no avail. Does anyone know how I can format the existing string such as to get rid of the time? I would prefer to stay away from substring functions, but if that's the only option then I guess I'll have to settle.
Edit: I'm open to options that will compare two date objects/strings and return true if the date is the same and the time is different.

The only way to get a specific format of date across different browsers is to create it yourself. The Date methods in ECMAScript are all implementation dependent.
If you have a date object, then:
// For format Wed Aug 01 2012
function formatDate(obj) {
var days = ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'];
var months = ['Jan','Feb','Mar','Apr','May','Jun',
'Jul','Aug','Sep','Oct','Nov','Dec'];
return days[obj.getDay()] + ' ' + months[obj.getMonth()] +
' ' + obj.getDate() + ' ' + obj.getFullYear();
}
Though a more widely used format is Wed 01 Aug 2012

Use the Date object's toDateString() method instead of its toString() method.
SIDE BY SIDE DEMO
Even so, it might be better to compare the two date objects directly:
Compare two dates with JavaScript

Related

unable to get the date format

I'm trying to change the date format in javascript where in a variable i m getting the date value like this "11/09/2019" and want to change in a format like this "11-09-2019".but somehow i'm getting this format "sat nov 09 2019" whereas it should be "tue sep 11 2019".
can anyone help me. any help would be appreciated.
var alt_date1 = "11/09/2019";
var date = new Date(alt_date1);
alert(date);
output: Sat Nov 09 2019 00:00:00 GMT+0530 (India Standard Time)
If I understand your question right, you want a different format i.e., "-" instead of "/" and you're also getting the wrong date? 2 days ahead? Depending on your environment (browser, node, etc) the Date API can behave differently. I think this link might help you: JavaScript's getDate returns wrong date (Not sure though, some answers pertain to the time zones it uses)
As for formatting look here:
https://codehandbook.org/javascript-date-format/
Example from that site:
let current_datetime = new Date()
let formatted_date = current_datetime.getDate() + "-" + (current_datetime.getMonth() + 1) + "-" + current_datetime.getFullYear()
console.log(formatted_date)
// output
"19-10-2018"
It's a little bit tricky to understand the question fully, but if you don't need a Date object, and you want to just format the string as 11-09-2019 it can be achieved with the simple replace function like this:
alt_date1.replace(/\//g, '-')

Javascript date object automatically add one day when creating from date string

In my javascript i want to convert date from date string.
i have string like
date = "Thu Sep 03 2015 19:30:00 GMT+0000"
Now i convert string using Date object.
var d = new Date(date);
But this gives me,
Fri Sep 04 2015 01:00:00 GMT+0530 (IST)
It automatically add one day into day. What is wrong?
It automatically add one day into day. What is wrong?
Nothing. The time you input is 19:30 GMT and the timezone on the device you're using is set to GMT+0530. Add 5 hours 30 minutes to 7:30pm and you get 01:00am the following day.
You should not use the Date constructor to parse strings, as it is inconsistent across browsers and until recently, entirely implementation dependent. Manually parse strings, or use a Date library.

JavaScript Changes My Date Based on Browser Time Zone

I am trying to create a Date object in JavaScript, passing a string like this:
2014-11-30T00:00:00.0000000
However, the value of the Date object is:
Sat Nov 29 2014 17:00:00 GMT-0700 (Mountain Standard Time)
It changed it to 11/29 when I want 11/30. Is there any way I can make the date 2014-11-30, regardless of what time zone the browser is in?
Note: One possible workaround is to use the Date(year, month, day) constructor; however, I am constructing the data in a JSON string, which doesn't appear to support this.
EDIT:
Actually, I just did a test and created a date using Date(2015, 1, 1) and it gives me:
Mon Feb 02 2015 00:00:00 GMT-0700 (Mountain Standard Time)
So I can't even create a date that way and have it be the date I want. I don't understand why this is so difficult.
You can use Date.UTC
The UTC() method differs from the Date constructor in two ways.
Date.UTC() uses universal time instead of the local time.
Date.UTC() returns a time value as a number instead of creating a Date
object.
EDIT - why does SO insist on making links so hard to spot? That, up there, is a link to the docs in case that wasn't obvious.
EDIT 2 - I think I misunderstood. Try this:
var d = new Date('2014-11-30T00:00:00.0000000');
var utc = new Date(
d.getUTCFullYear(),
d.getUTCMonth(),
d.getUTCDate(),
d.getUTCHours(),
d.getUTCMinutes(),
d.getUTCSeconds()
);
alert('d: ' + d + "\n" + 'utc: ' + utc);

JavaScript creating new Date from a string without changing timezone

I'm trying to convert a date string into a date object without changing the timezone. Here is the standard behavior:
new Date ("2014-10-24T00:00:00")
result
Thu Oct 23 2014 19:00:00 GMT-0500 (Central Daylight Time)
I am able to reverse the timezone by getting the offset in minutes, multiplying it by 60,000, and then adding that to the new string date.
new Date(new Date("2014-10-24T00:00:00").getTime() + new Date().getTimezoneOffset()*60000)
This works, but it seems like there must be a better way that doesn't require created three date objects.
Do not parse strings using the Date constructor. It calls Date.parse which, despite being standardised for one version of ISO 8601 strings in ES5, is still almost entirely implementation dependent.
I'm trying to convert a date string into a date object without changing the timezone.
> new Date ("2014-10-24T00:00:00")
That string will be treated differently in different browsers. If you want it to be treated as UTC, then it is simple to parse yourself:
function parseISOAsUTC(s) {
var b = s.split(/\D/);
return new Date(Date.UTC(b[0],--b[1],b[2],b[3],b[4],b[5],(b[6]||0)));
}
console.log(parseISOAsUTC('2014-10-24T00:00:00').toISOString()); // 2014-10-24T00:00:00.000Z
Now you can be certain that the string will be treated as UTC in all browsers in use (including the 20% or so still using IE 8 and lower).
If, on the other hand, you want the string to be treated as a local time, then just remove the Date.UTC part:
function parseISOAsLocal(s) {
var b = s.split(/\D/);
return new Date(b[0],--b[1],b[2],b[3],b[4],b[5],(b[6]||0));
}
console.log(parseISOAsLocal('2014-10-24T00:00:00')); // Fri 24 Oct 2014 00:00:00 <local timezone>
Here is an implementation of zerkms's solution.
new Date("2014-10-24T00:00:00".replace('T', ' '))
result
Fri Oct 24 2014 00:00:00 GMT-0500 (Central Daylight Time)

Unexpected results parsing date strings in JavaScript

I'm working on a JavaScript application. I have two different String dates 31/10/2013 and 1/11/2013 and I create an instance of these two dates with new Date(string).getTime();
But it shows this (the same date ) as the result:
console.log(date_s + " after new date " + date );
31/10/2013 after new date Fri Nov 1 00:00:00 UTC 2013
1/11/2013 after new date Fri Nov 1 00:00:00 UTC 2013
You haven't a valid string in you new Date(string)
Some example to initialize dates
var my_date=new Date(2013,10,31)
and all the documentation on http://www.w3schools.com/js/js_obj_date.asp
31/10/2013 is not a valid date string unless you've got maybe some localization going on. To the default localization settings for en-US, it should be 10/31/2013. What your string means is "month 31 of 2013" which pushes new Date('31/10/2013') to be some time in 2015 because that's where it resolves the date due to that "month 31."
If you want an easy solution, try moment.js - a powerful javascript date parser/formatter/validator/manipulator.
In moment, you can parse date with the syntax like this [doc]:
//this will gives you a correct date object
moment('31/10/2013', 'DD/MM/YYYY').toDate();
Else, you can always welcome to split and rebuild the date object.

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