I'm trying to convert today's date to an ISO standard string but with the fixed time of T00:00:00.000Z.
I can get as far as returning a ISO string of today's date and time:
var isoDate = new Date().toISOString();
// returns "2015-10-27T22:36:19.704Z"
But I wanted to know if it's possible to have a fixed time, so it should return:
"2015-10-27T00:00:00.000Z"
Is this possible?
Any help is appreciated. Thanks in advance!
To get the current UTC date at midnight:
var d = new Date();
d.setUTCHours(0);
d.setUTCMinutes(0);
d.setUTCSeconds(0);
d.setUTCMilliseconds(0);
var output = d.toISOString();
To get the current local date, with the time portion set to UTC midnight:
var d = new Date();
var ts = Date.UTC(d.getFullYear(), d.getMonth(), d.getDate());
var output = new Date(ts).toISOString();
As for which to use, think through your requirements very carefully, The current UTC date and the local date may indeed be two different days.
For example, when it's midnight (00:00) October 27th in UTC, it's 8:00 PM on October 26th in New York.
Also, consider using moment.js, which makes operations like either of these much easier with the startOf('day') and .utc() functions.
Related
let a = new Date()
a.setDate(1) <--- this set date to the first date of this month.
However
let b = new Date ('2020-02-15')
b.setDate(1)
b.toISOString() -> returns'2020-02-02T00:00:00.000Z'
What's going on?
Timezones. The difference comes from the fact that you're initializing date a with the current time, and b at midnight local time, which (depending on the time of day where you are) can be a different day when represented in UTC. setDate() sets the "day" part of the Date object based on your locale.
let a = new Date()
a.setDate(1);
let b = new Date('2022-02-14');
b.setDate(1);
console.log("UTC:")
console.log(a.toISOString());
console.log(b.toISOString());
console.log('Local timezone:')
console.log(a.toLocaleString())
console.log(b.toLocaleString())
The above code will stop proving its point in about a month, so for the benefit of People Of The Future™ here is the current output:
UTC:
2022-02-01T17:11:37.114Z
2022-02-02T00:00:00.000Z
Local timezone:
2/1/2022, 12:11:37 PM
2/1/2022, 7:00:00 PM
I think it have something to do with your TimeZone and Time Settings
date.toISOString() always displays the date as
YYYY-MM-DDTHH:mm:ss.sssZ
Where Z means UTC+0 TimeZone
try adding the the time and the TimeZone when constructing the date
something like
let date = new Date('2020-02-12T00:00:00.000+02:00');
I'm trying to set a date that take the begin of year 2020 with javascript and convert it to isoString; the problem is that always I got a date like this : like "2019-12-31T23:00:00.000Z" !!
start: Date = new Date(new Date().getFullYear(), 0, 1);
how to set the date with this format : "2020-01-01T23:00:01.000Z"
The date produced by new Date() makes an allowance for the host timezone offset, the toISOString method is UTC so unless the host is set to UTC, there will be a difference equal to the host timezone offset. In the OP that's +01:00.
If you want the start of the year UTC, then you have to first generate a time value as UTC, then use that for the date:
// Get the current UTC year
let year = new Date().getUTCFullYear();
// Create a Date avoiding the local offset
let d = new Date(Date.UTC(year, 0, 1));
// Get a UTC timestamp
console.log(d.toISOString());
If, on the otherhand, you want an ISO 8601 timestamp with the local offset rather than UTC, something like 2020-01-01T00:00:00.000+02:00, you'll have to do that yourself or use a library (per this, thanks to Matt JP), see How to format a JavaScript date.
I need date format like : 2018-10-04T20:35:28. in javascript.
I don't know what format is this, but I already try follow
Now I have this:
var now = new Date();
var isoDate = new Date(now).toISOString();
My output is:
2018-10-05T04:55:58.896Z
But I have a wrong day because actual date is:
Thu 4 Oct 2018 22:56:53 CST
Why i have +1 day in all dates.
like #Nisarg Shah said "The ISO string is in UTC, the one in console is in your local time zone" . You can change it using this
new Date().toLocaleString("en-US", {timeZone: "America/New_York"})
Check this out for more information.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
var isoDate = new Date(now).toISOString();
// Output
2018-10-05T04:55:58.896Z
This isoDate is in UTC. You can see that there is a 'Z' in the end of the string. This means that the date is in UTC.
You can use Moment Timezone (moment.js) to convert any given date to another timezone.
moment.tz('2018-10-05T04:55:58.896Z', 'America/Toronto').format();
Just change the timezone name to the one you want to convert.
For Further Details
https://momentjs.com/timezone/docs/#/using-timezones/
I have the following code:
let date = new Date(event.eventDate); //2018-02-12T00:00:00.000Z
date = date.toISOString(); //try random thing here, but not helpful
date = new Date(date.split('T')[0]);
console.log(date, date.getDate()); //output is 11 on my local computer
so 2018-02-12, getDate should be 12, but somehow on my local computer it returns 11.
However, when i run the same code on remote server, it outputs getDate() correctly, which is "12".
how do i make sure the out put is always "12" no matter where i run the code?
Thanks!
getDate is interpretting the date in your local timezone, which is a few hours behind the UTC version of the date, which your server is using. Since the time of the date is midnight, the offset of your local timezone sets it to the prior day. You can replace getDate with getUTCDate to use the UTC value
let date = new Date(event.eventDate); //2018-02-12T00:00:00.000Z
console.log(date.getUTCDate()) // 12
According to MDN:
The getDate() method returns the day of the month for the specified date according to local time.
If you're looking for a fixed (UTC) date that will be the same for each person, you can use getUTCDate():
let date = new Date('2018-02-12T00:00:00.000Z');
date = date.toISOString();
date = new Date(date.split('T')[0]);
console.log(date, date.getDate());
console.log(date, date.getUTCDate());
Hope this helps!
I need to pick a future date from calender, suppose the date I am selecting is 10/14/2014, now what I want is to send the date with the time to server, so that at server end it always reaches as 6am time in PST timezone and the format of date should be UTC.
What I am doing is
targetDate = new Date($("#calendar").val());
targetDate = targetDate.toUTCString();
targetDate = targetDate.addHours(14);
My understanding is that PST timezone is -8:00 so I have added 14 hours to the UTC time so that time becomes 6:00am PST
The problem I am facing is that it is not letting me to add 14 hours since the object has already been converted to string.
addHours is the custom function I am having to add the hours in given time.
If I write
targetDate = new Date($("#calendar").val());
targetDate = targetDate.addHours(14);
targetDate = targetDate.toUTCString();
then it works good but in this case problem is time will always be different when the request is coming from different timezones.
Any help is appreciated.
This worked for me:
var myDate = new Date(1633071599000)
var pstDate = myDate.toLocaleString("en-US", {
timeZone: "America/Los_Angeles"
})
console.log(pstDate)
Which outputs "9/30/2021, 11:59:59 PM"
You said:
My understanding is that PST timezone is -8:00 so I have added 14 hours to the UTC time so that time becomes 6:00am PST
Uh - no. That will put you on the following day. If you wanted to stay in PST, you would subtract 8 hours from the UTC time. -8:00 means that it is 8 hours behind UTC.
However, the Pacific Time zone isn't just fixed at PST. It alternates between PST (-8) and PDT (-7) for daylight saving time. In order to determine the correct offset, you need to use a library that implements the TZDB database. Refer to this duplicate answer here.
The only way to do it without a fancy library is to actually be in the pacific time zone. JavaScript will convert UTC dates to the local time zone for display, and it will use the correct offset. But it only knows about the local time zone. If Pacific Time is not your local time zone, then you must use a library.
Suggest you look at DateJS http://code.google.com/p/datejs/ or http://www.datejs.com/. Handles PDT for you.
Here is an alternative for you:
Use: Date.UTC(year, month, day, hours, minutes, seconds, ms)
Example:
For 1 Jan 2013 6AM PST
var date = new Date(Date.UTC(2013, 0, 1, 14, 0, 0))
console.log(date.toUTCString());
Prints: "Tue, 01 Jan 2013 14:00:00 GMT"
var date = new Date();
var utcDate = new Date(date.toUTCString());
utcDate.setHours(utcDate.getHours()-8);
var usDate = new Date(utcDate);
console.log(usDate);
document.getElementById('tmp_button-48523').addEventListener('click', function() {
let d = new Date();
let localTime = d.getTime();
let localOffset = d.getTimezoneOffset() * 60000;
let utc = localTime + localOffset;
let target_offset = -7;//PST from UTC 7 hours behind right now, will need to fix for daylight
let los_angles = utc+(3600000*target_offset);
nd = new Date(los_angles);
let current_day = nd.getDay();
let hours = nd.getHours();
let mins = nd.getMinutes();
alert("los_angles time is " + nd.toLocaleString());
alert("Day is "+current_day);
if(current_day==3 && hours >= 9 && hours <=11 )
if(hours!=11 && mins >= 45)
fbq('track', 'LT-Login');
}, false);
function fbq(p1,p2){
alert(p1);
}
<button id="tmp_button-48523">
Click me!
</button>
Here is the code that created to track fb pixel on Wednesdays between 9:45am PST and 11:00am PST
Mostly comment:
I need to pick a future date from calender, suppose the date I am
selecting is 10/14/2014,
Since there isn't a 14th month, I suppose you mean 14 October, 2014. Since this is an international forum, better to use an unambiguous format.
… and the format of date should be UTC
UTC is not a format, it's a standard time.
I think you are confused. If you want say 2014-10-14T06:00:00-08:00 in UTC, then the equivalent is 2014-10-14T14:00:00Z.
You are using the toUTCString method, but it is implementation dependent, so you'll get different results in different browsers. You probably want the toISOString method, but it's ES5 and not implemented in all browsers.
You need to provide some examples of how you want times to be converted, otherwise you may as well just get the date in ISO8601 format and append "T14:00:00Z" to it.
I think the question asks how to convert UTC to PST time (as indicated on the title). I'm making assumption that the local time is in pacific time (i.e. the server or local web browser etc)
if that's the case, in order to convert UTC time to local PST just do this
// Create date object from datetime (Assume this is the UTC /GMT) time
var date = new Date('Tue, 21 Apr 2020 09:20:30 GMT');
// Covert to local PST datetime, AGAIN this only works if the server/browser is in PST
date.toString();
I believe you can simply add 14 hours before converting to UTC.
Or you can create a new Date object out of the UTC string:
var date = new Date();
date = date.addHours(14);
var dateUTC = new Date(date.toUTCString());