Hi I have a json which I am getting some data. There the time format I am getting is like
1367023443000
I want to convert this to the Normal PST format. Ive tried using Javascript`s Date method. Passed the Unix time to the Date method,
var now = new Date(1367023443000);
I am getting only IST value, But not PST. What should I do here to convert the Unix timestamp to PST?
If you're not actually in the US Pacific Time zone, the only way to do this reliably in JavaScript is with a library that implements the TZDB database. I list several of them here.
For example, using walltime-js library, you can do the following:
var date = new Date(1367023443000);
var pacific = WallTime.UTCToWallTime(date, "America/Los_Angeles");
var s = pacific.toDateString() + ' ' + pacific.toFormattedTime();
// output: "Fri Apr 26 2013 5:44 PM"
You can't just add or subtract a fixed number, because the target time zone may use a different offset depending on exactly what date you're talking about. This is primarily due to Daylight Saving Time, but also because time zones have changed over time.
Related
I got timestamp utc of new york from weather api, want to display current time in New York but it gives output something like this 'UTC Sun Dec 01 2019 05:00:00 GMT+0530 (India Standard Time)'.
See the code for reference
// Code 1
//I get timestamp_utc when console.log(data)
//timestamp_utc: "2019-12-01T05:00:00"
const utc = new Date(data.timestamp_utc)
console.log('UTC', utc)
// UTC Sun Dec 01 2019 05:00:00 GMT+0530 (India Standard Time)
// Code 2
// Another code for getting current time but, failed
var usaTime = new Date().toLocaleString("en-US", {timeZone: timezone}); // Here timezone is from props
console.log('USA time: '+usaTime) // USA time: 12/1/2019, 4:59:58 AM
I also have timezone data getting from weather API. My aim is to get current time based on timezone or utc timestamp. As you can see both my trials are unsuccessful. Expected output is 6:39 PM which is now current time in New York. Is there any good solution?
Let me start with your 'code 2'. This is the same as what you wrote but with the timezone filled in...
const timezone = "America/New_York";
const usaTime = new Date().toLocaleString( "en-US", { timeZone: timezone});
console.log( 'usaTime =', usaTime );
For me this works. I get the current time in NY formatted correctly for USA. I'm not sure why yours did not work but I wonder what you specified for the timezone string.
I also a bit puzzled by your 'Code 1'. The 'new Date()' that you created is being converted to a string and then printed by your console.log statement, but this should result in a ISO 8601 string and you seem to be getting a locale string (the date format).
Though the example string you gave is in ISO 8601 format, it is not explicitly UTC because it does not end with a Z, nor does it end with a time zone offset such as +00:00. Thus when you parse it with the Date constructor, it is interpreted as local time. You can fix this by adding the Z yourself (assuming the timestamp_utc field is consistently a string in that format):
// timestamp_utc: "2019-12-01T05:00:00"
const utc = new Date(data.timestamp_utc + 'Z'); // adding the Z forces parsing as UTC
Now you have a Date object. However, if you just pass it to console.log, the output you see is implementation dependent. You will either see the local time in the same format you'd get by calling toString, or you will see the UTC time in the same format you'd get by calling toISOString.
To get the time in a different time zone, now you can call toLocaleString and pass the timeZone option. This assumes that the time zone is a valid IANA time zone identifier, and that the environment where the code is running fully supports the time zone features of the ECMAScript Internationalization Specification (ECMA-402). This is indeed the case with most modern browsers, but you will not get correct output in older browsers such as Internet Explorer.
const usEasternTime = utc.toLocaleString("en-US", {timeZone: 'America/New_York'});
Lastly from your variable name usaTime, I think perhaps you might be under the assumption that the US has a single time zone, but it does not. You will need to pass the correct time zone identifier. See the list on Wikipedia.
Define the time zones of origin ($ sourceDate) and destination (to convert).
$sourceTimeZone = 'utc';
$targetTimeZone = 'America/Bogota';
Separate the components of the date of origin that is in the format ‘m / d / y h: m: s’.
list($month, $day, $year, $hours, $minutes, $seconds) = sscanf($sourceDate, "%d/%d/%d %d:%d:%f");
Build the DateTime object indicating the date and time zone in which it is located.
$datetime = new DateTime("{$year}-{$month}-{$day} {$hours}:{$minutes}:{$seconds}",
new DateTimeZone($sourceTimeZone));
Modify the time zone of the DateTime to the destination time zone.
$datetime -> setTimezone(new DateTimeZone($targetTimeZone));
Get the components of the new date with the modified time zone.
list($month2, $day2, $year2, $hours2, $minutes2, $seconds2) = sscanf($datetime -> format(‘m/d/Y H:i:s’), “%d/%d/%d %d:%d:%f”);
Show the dates.
echo "En {$sourceTimeZone}: {$day}/{$month}/{$year} {$hours}:{$minutes}:{$seconds}<br/>";
echo "En {$targetTimeZone}: {$day2}/{$month2}/{$year2} {$hours2}:{$minutes2}:{$seconds2}<br/>";
PD: For JavaScript this can help you Convert time to different timezone with jQuery
I have a date I want to convert based on their timezone.
For example, I want to set it in EST time (America/New_York)
2019-04-24 12:00:00
and if the user comes across the site from America/Los_Angeles, it will appear:
2019-04-24 09:00:00
I need to be able to return the hour, so in that example: 9.
I tried using https://github.com/iansinnott/jstz to determine their timezone and https://moment.github.io/luxon in hopes of handling the conversion w/o any luck.
I was testing by changing the timezone on my computer w/o any luck.
It sounds like you're asking to convert from a specific time zone to the user's local time zone (whatever it may be). You do not need time zone detection for that, but at present you do need a library. (Answers that suggest using toLocaleString with a time zone parameter are incorrect, as that function converts to a specific time zone, but cannot go the other direction.)
Since you mentioned Luxon, I'll provide a Luxon specific answer:
luxon.DateTime.fromFormat('2019-04-24 12:00:00', // the input string
'yyyy-MM-dd HH:mm:ss', // the format of the input string
{ zone: 'America/New_York'}) // the time zone of the input
.toLocal() // convert to the user's local time
.toFormat('yyyy-MM-dd HH:mm:ss') // return a string in the same format
//=> "2019-04-24 09:00:00"
This capability is also provided by other libraries, such as date-fns-timezone, js-Joda, or Moment-Timezone, but it is not yet something built in to JavaScript.
Converting date based on the time can be done like this. reference convert date to another time zone example snippet is under.
var usaTime = new Date().toLocaleString("en-US", {timeZone: "America/New_York"});
usaTime = new Date(usaTime);
console.log('USA time: '+usaTime.toLocaleString())
var usaTime = new Date().toLocaleString("en-US", {timeZone: "America/Los_Angeles"});
usaTime = new Date(usaTime);
console.log('USA time: '+usaTime.toLocaleString())
You could keep a list of timzeone identifiers and a list of their corresponding +/- number of hours with respect to your local time (which is returned by your time function).
Once you have a user's time zone, and you have extracted the current hour from the local timestamp simply look up the timezone in your list and use it's index to access the second list to find how many hours to add or subtract from the users time.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
var date = new Date(Date.UTC(2012, 11, 12, 3, 0, 0));
// toLocaleString() without arguments depends on the implementation,
// the default locale, and the default time zone
console.log(date.toLocaleString());
// → "12/11/2012, 7:00:00 PM" if run in en-US locale with time zone America/Los_Angeles
Or you can use getYear, getMonth, getDate, getHours, getMinutes, getSeconds to format your own representation of the date. These methods all return values according to the user's local timezone.
I think the question may need more clarification - my first impression was you refer to a date-time that you already have and serve from the server. Doesn't this problem boil down to the Date object being "user-timezone-aware"? or not? But it is (some methods are, to be exact)
Your date/time is 2019-04-24 12:00:00 EDT (i assume P.M.)
This means the Unix timestamp of this in milliseconds is 1556121600000
(i assume daylight is on for April so not pure EST but EDT and an offset of UTC-4:00)
When you call
console.log(new Date(1556121600000).getHours())
doesn't this return 9 as you suggest, for Javascript executed on a browser from America/Los_Angeles with PDT timezone?
As suggested at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getHours :
The getHours() method returns the hour for the specified date,
according to local time.
We have a bunch of systems events that are stored in a database with a milliseconds timestamp in UTC. In order for me to get the JSON I need, I just need to send a request like this....
http://xxx.xxx.xxx/gimmeJson?starttime=MILLISECONDS&endtime=MILLISECONDS
So when an event happened at 11:00pm CST it has been converted to the UTC millisecond equivalent and stored.
I am having a big issue wrapping my head around milliseconds because I'm thinking about it like timezones.
I saw a SO question similar to this here: How do I convert UTC/ GMT datetime to CST in Javascript? (not local, CST always) and it was close but not quite there.
If timestamps are stored in UTC milliseconds, how can I query them for their Central time equivalent? By that I mean my boss wants a report of all events that happened in the central timezone but I have to query a database that has these timestamps stored as UTC milliseconds.
Ultimately I have to come up with ** some ** number to send on a URL for UTC MILLISECONDS that is the equivalent of say "September 24, 12:00:00 Central". What compounds this issue is that the web service is fairly new and has been shown to be a bit buggy so I need to make sure I have this right.
// construct a moment object with Central time input
var m = moment('2015-01-01 00:00:00').format('x');
// convert using the TZDB identifier for GMT
m.tz('Europe/London');
// format output however you desire
var s = m.format("x");
Can someone confirm I am on the right track?
Many, many thanks in advance.
There's no such thing as milliseconds timestamp in UTC or any other timezone. Millisecond timestamps are always from 1970-01-01T00:00:00.000Z; they are zone agnostic.
In order to get the timestamp for the zone you want, simple create a Date instance and use the Date.prototype.getTime method
var cstTime = new Date('2016-09-24T12:00:00-06:00');
console.log('CST in ISO 8601:', cstTime.toISOString());
console.log('CST timestamp:', cstTime.getTime());
var localTime = new Date();
console.log('Local time in ISO 8601:', localTime.toISOString());
console.log('Local timestamp:', localTime.getTime());
I have a javascript countdown timer that works by taking a specified date and time, and comparing it to the current date and time. The issue is, the current time is relative to the users timezone, so the time remaining is different between users.
How can I have the timer countdown till a time in a specific timezone, in my case GMT -5 hours?
I understand i can use the below code to get the users timezone, but I am lost as how to use this.
myDateObj.getTimezoneOffset( ) / 60
You can use Date.UTC(year,month,day,hours,minutes,seconds,msec)
It operates just like the Date constructor, but returns the timestamp of the arguments at Greenwich time (offset=0) instead of local time.
var localtime=new Date(Date.UTC(year,month,day,hours,minutes,seconds,msec))
returns the local time for the UTC time specified.
Everyone (whose clock is set correctly) will end the countdown together.
A quick search reveals: convert-the-local-time-to-another-time-zone-with-this-javascript
Following the article verbatim gets you this example:
var d = new Date();
var localTime = d.getTime();
var localOffset = d.getTimezoneOffset() * 60000;
var utc = localTime + localOffset;
// obtain and add destination's UTC time offset
// for example, Bombay
// which is UTC + 5.5 hours
var offset = 5.5;
var bombay = utc + (3600000*offset);
var nd = new Date(bombay);
alert("Bombay time is " + nd.toLocaleString() + "<br>");
jsFiddle: http://jsfiddle.net/GEpaH/
Just update with your desired offset and you should be all set.
Just create a Date with an RFC 2822-timestamp with timezone. That time will then be converted to the users current location (based on OS settings). Even with corrections for daylight savings time!
I'm in Norway, which currently is in daylight savings time, so it's GMT+2. Here is what happens when I create a Date object using GMT-0500:
var myDateObj = new Date("Fri Apr 17 2015 12:00:00 GMT-0500 (CDT)");
myDateObj.toString();
Fri Apr 17 2015 19:00:00 GMT+0200 (CEST)
How to get the correct date string for your location? If it's the timezone you're currently in; just do myDateObj.toString() in your browsers dev-tools console. For a different timezone; change the timezone in your operating system first. (Or read the RFC)
new Date().toString();
Fri Apr 17 2015 12:36:57 GMT+0200 (CEST)
You don't really say exactly what your are trying to accomplish. The javascript date object retrieves the local time and the "timezone offset" (relative to GMT (UTC)). These are of course "set" by the user so even if in the same time zone, two users are very unlikely to have the same "time".
If you are trying to time between different users you need to be referencing some centralized time authority.
I would use an AJAX type call (XMLHttpRequest) to a page own my own server that returns my server's time. That way each user is referencing the same time.
Google XMLHttpRequest to find examples of the JS code you need (and oftentimes the corresponding server-side code for a simple service such as this).
PS: I would also install some simple client software to keep the time on my server accurate by synching with an atomic clock every 10 minutes.
You can't get an accurate date with JavaScript as it is client-side and it is based on the user's operating system clock. You can use jCounter to display countdowns based on server-side timezones.
But hey, if you really want to do it yourself, download jCounter and you'll find a dateandtime.php file as well which retrieves the current date server-side, as timestamp (it will have to be placed on a server btw, not on your desktop :P)
Check how that script uses that file and retrieves the real current date to operate against it and calculate accurate countdowns.
Cheers
To revise the approach Brandon has taken to calculate a UTC-shifted time, we can slim the code down into a two-line extension of the Date object:
/* getOffsetDate - Returns a Date shifted by a certain offset
* #param offset the UTC offset to shift, in hours
* #return new date object shifted by UTC offset
*/
Date.prototype.getOffsetDate = function( offset ) {
utc = this.getTime() + (this.getTimezoneOffset() * 60000);
return new Date(utc + (3600000*offset));
}
You can then calculate the UTC-5 shifted date as follows:
myDate = new Date().getOffsetDate(-5);
It should be noted that extending native prototypes in this manner is generally considered a bad practice since it muddles core objects that other libraries depend upon. To justify it, you'd have to argue this functionality should be a native part of the Date object.
I have a problem converting a timestamp in javascript.
I have this timestamp:
2011-10-26T12:00:00-04:00
I have been trying to format it to be readable. So far, it converts this using the local time of my system instead of the GMT offset in the timestamp. I know the timezone that this was created in is EST. I'm in PST, so the times are being offset by 3 hours.
Instead of this showing as:
Wednesday October 26, 2011 12:00 pm
It shows as:
Wednesday October 26, 2011 9:00 am
I have tried a few different solutions, but the latest one is found here: http://blog.stevenlevithan.com/archives/date-time-format
I am less concerned with the formatting part as I am with figuring out how to handle the GMT offsets. Would appreciate any help and insight anyone can provide.
Date objects are created in the local zone. If the date string was created in a different time zone, then you need to adjust the date object to allow for the difference.
The abbreviations PST and EST are ambiguous on the web, there is no standard for time zone abbreviations and some represent two or zones. You should express your zone only in terms of +/- UTC or GMT (which are the same thing, more or less).
You can get the local time zone offset using Date.prototype.getTimezoneOffset, which returns the offset in minutes that must be added to a local time to get UTC. Calculate the offset for where the time string was created and apply it to the created date object (simply add or subtract the difference in minutes as appropriate).
If your time zone is -3hrs, getTimezoneOffset will return +180 for a date object created in that zone. If the string is from a zone -4hrs, its offset is +240. So you can do:
var localDate = new Date('2011-10-26T12:00:00') // date from string;
var originOffset = 240;
var localOffset = localDate.getTimezoneOffset();
localDate.setMinutes( localDate.getMinutes() + originOffset - localOffset );
Adding the origin offset sets it to UTC, subracting the local offset sets it to local time.
It would be much easier if the time string that was sent by the server was in UTC, that way you just apply the local offset.
Edit
IE will not parse a time string with an offset, and Chrome thinks that the above time string is UTC and adjusts for local offset. So don't let Date parse the string, do it manually.
It doesn't matter what time zone you are- the time stamp will result in a different local time for every different time-zone, but they all will be correct, and anyone checking the UTC time of the date will get the same time-stamp:
new Date('2011-10-26T12:00:00-04:00').toUTCString()
returns
Wed, 26 Oct 2011 16:00:00 GMT
and getTime() anywhere returns the same milliseconds universal timestamp:1319644800000