I am trying to convert Twitter datetime to a local iso-string (for prettyDate) now for 2 days. I'm just not getting the local time right..
im using the following function:
function getLocalISOTime(twDate) {
var d = new Date(twDate);
var utcd = Date.UTC(d.getFullYear(), d.getMonth(), d.getDate(), d.getHours(),
d.getMinutes(), d.getSeconds(), d.getMilliseconds());
// obtain local UTC offset and convert to msec
localOffset = d.getTimezoneOffset() * 60000;
var newdate = new Date(utcd + localOffset);
return newdate.toISOString().replace(".000", "");
}
in newdate everything is ok but the toISOString() throws it back to the original time again... Can anybody help me get the local time in iso from the Twitterdate formatted as: Thu, 31 May 2012 08:33:41 +0000
This question is related to
javascript
datetime
timezone-offset
moment.js
is great but sometimes you don't want to pull a large number of dependencies for simple things.
The following works as well:
var tzoffset = (new Date()).getTimezoneOffset() * 60000; //offset in milliseconds
var localISOTime = (new Date(Date.now() - tzoffset)).toISOString().slice(0, -1);
// => '2015-01-26T06:40:36.181'
The slice(0, -1)
gets rid of the trailing Z
which represents Zulu timezone and can be replaced by your own.
moment.js FTW!!!
Just convert your date to a moment and manipulate it however you please:
var d = new Date(twDate);
var m = moment(d).format();
console.log(m);
// example output:
// 2016-01-08T00:00:00-06:00
It will be very helpful to get current date and time.
var date=new Date();
var today=new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().replace(/T/, ' ').replace(/\..+/, '');
Using moment.js
, you can use keepOffset
parameter of toISOString
:
toISOString(keepOffset?: boolean): string;
moment().toISOString(true)
This date function below achieves the desired effect without an additional script library. Basically it's just a simple date component concatenation in the right format, and augmenting of the Date object's prototype.
Date.prototype.dateToISO8601String = function() {
var padDigits = function padDigits(number, digits) {
return Array(Math.max(digits - String(number).length + 1, 0)).join(0) + number;
}
var offsetMinutes = this.getTimezoneOffset();
var offsetHours = offsetMinutes / 60;
var offset= "Z";
if (offsetHours < 0)
offset = "-" + padDigits(offsetHours.replace("-","") + "00",4);
else if (offsetHours > 0)
offset = "+" + padDigits(offsetHours + "00", 4);
return this.getFullYear()
+ "-" + padDigits((this.getUTCMonth()+1),2)
+ "-" + padDigits(this.getUTCDate(),2)
+ "T"
+ padDigits(this.getUTCHours(),2)
+ ":" + padDigits(this.getUTCMinutes(),2)
+ ":" + padDigits(this.getUTCSeconds(),2)
+ "." + padDigits(this.getUTCMilliseconds(),2)
+ offset;
}
Date.dateFromISO8601 = function(isoDateString) {
var parts = isoDateString.match(/\d+/g);
var isoTime = Date.UTC(parts[0], parts[1] - 1, parts[2], parts[3], parts[4], parts[5]);
var isoDate = new Date(isoTime);
return isoDate;
}
function test() {
var dIn = new Date();
var isoDateString = dIn.dateToISO8601String();
var dOut = Date.dateFromISO8601(isoDateString);
var dInStr = dIn.toUTCString();
var dOutStr = dOut.toUTCString();
console.log("Dates are equal: " + (dInStr == dOutStr));
}
Usage:
var d = new Date();
console.log(d.dateToISO8601String());
Hopefully this helps someone else.
EDIT
Corrected UTC issue mentioned in comments, and credit to Alex for the dateFromISO8601
function.
My solution without using moment
is to convert it to a timestamp, add the timezone offset, then convert back to a date object, and then run the toISOString()
var date = new Date(); // Or the date you'd like converted.
var isoDateTime = new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString();
Moment js solution to this is
var d = new Date(new Date().setHours(0,0,0,0));
m.add(m.utcOffset(), 'm')
m.toDate().toISOString()
// output "2019-07-18T00:00:00.000Z"
Source: Stackoverflow.com