I need to make sure if its after 21 hours in UTC or 4 pm est to set the initial day in the date picker as the next day although i need help with the logic of getting a date time object of the last time when it was last 21 hours in UTC.
For example if its 22 hours in utc the last time it was 21 hours was a hour ago so i just use the same utc date and subtract a hour
although a couple hours after it will be a new utc date how do i represent that? Does any one have any ideas?
Im using datetime and using custom color picker libraries is not the solution i'm interested in. I just need help on the logic of how to set Initial date/ Current date in my custom calendar picker with the criteria that after 21 hours utc it should move to the next day.
You just need to test the UTC hour, which is returned by getUTCHours, so:
function getDate(date = new Date()) {
// Copy date so don't affect original
let d = new Date(date);
// If 2100 UTC or later, set to tomorrow UTC
if (d.getUTCHours() > 20) {
d.setUTCDate(d.getUTCDate() + 1);
}
// Set the time to 2100
d.setUTCHours(21,0,0,0);
return d;
}
// Current value
console.log(getDate());
// Value for 2021-03-01T22:00:00Z
console.log(getDate(new Date(Date.UTC(2021,2,1,22)))); // T21:00:00.000Z
From server I am getting a date time like this format "Thu, 02-Jan-2020 08:32:18 GMT" and I want to compare it current GMT date time . How I will do that in javascript.
const serverDate = new Date('Thu, 02-Jan-2020 08:32:18 GMT');
const clientDate = new Date();
const clientOffset = clientDate.getTimezoneOffset() * 60 * 1000; // get milliseconds from minutes
if (serverDate.getTime() > clientDate.getTime() + clientOffset) {
console.log('serverDate is later than clientDate');
} else {
console.log('serverDate is earlier than clientDate');
}
Here we are using built-in Date objects. getTime() method from this example is used to get the number of milliseconds passed since January 1st, 1970. This way we ended up just comparing 2 numbers.
If you set different timezone on a client device than GMT+0 on the server, getTimezoneOffset() comes to help. It returns the number of minutes we need to add to the getTime() result so that the client timestamp will also be in GMT+0 timezone.
I would suggest using moment.js. Using it is as simple as for example x.isSameAs(y), x.isBefore(y) x.isAfter(y)
I'm trying to convert a date from local to midnight UTC so that I can then save into a SQL database and be able to query by matching dates. For example, if today is Sep 20, 2015 at any time in any time zone that I may be in, then I should end up with a timestamp of Sep 20, 2015, 0:00am UTC, but instead I end up with Sep 20, 2015, 2:00am UTC regardless of which time zone I set my clock to. This should be simple, but for some reason when I convert to UTC I end up off by two hours, so I delete 7200 seconds to get midnight. This seems to be working, but because I don't know why I'm off by two hours I'm afraid I may run into problems later. My code is below, only 4 lines. Any help would be appreciated.
var date = new Date();
date.setUTCFullYear(date.getFullYear(), date.getMonth(), date.getDate());
date.setUTCHours(0,0,0,0);
dateUTC = date.getTime()/1000-7200;
It's not clear what exactly isn't working, but you should use Date.UTC() and it will work:
var date = new Date();
alert(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate())/1000)
To get rid of time zone difference you could try:
date.setMinutes(date.getMinutes() - date.getTimezoneOffset())
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());
Hi I am trying to create a unix timestamp to represent the latest time of the current day (23:59:59) like so:
current_date = new Date();
end = new Date(current_date.getFullYear(), current_date.getMonth(), current_date.getDate(),23,59,59);
end = end.getTime() / 1000;
When I alert out the unix timestamp and convert it back into a datetime though it is an hour behind and represents 22:59:59 rather than 23:59:59.
I have to pass 24 to the date function for the hour parameter instead of 23 if I want 11pm is this right?
I am located in England so my time should be in GMT
new Date() will create the date in your timezone, whereas timestamps are in UTC. You appear to be in BST (GMT+1) hence the off-by-one error.
Instead, create a date and then use setUTCHours(23), setUTCMinutes(59) and setUTCSeconds(59) to get the correct timestamp.