I have date in MM/DD/YYYY HH:MM AM/PM format
Example 07/27/2022 10:36 AM
I want to convert it into Epoch timestamp which is 1658898360
You can use the date.getTime method to convert it to epoch:
const date = new Date("07/27/2022 10:36 AM");
console.log(date.getTime() / 1000)
Just be sure that you (or the client) is in the same timezone you are expecting (IST in this case).
Or just add GMT+5:30 to ensure this.
const date = new Date("07/27/2022 10:36 AM GMT+5:30");
console.log(date.getTime() / 1000)
The Date object in Javascript is notoriously tricky to work with, and date parsing is sadly lacking. Simply using
const dateString = "07/27/2022 10:36 AM"
const date = new Date(dateString)
might work, but not reliably.
One option is to use the date-fns library:
import { parse, getUnixTime } from 'date-fns'
const date = parse('07/27/2022 10:36 AM', 'MM/dd/yyyy hh:mm a', new Date())
const epoch = getUnixTime(date)
You can use below sample code:
function epoch (date) {
return Date.parse(date)
}
const dateToday = new Date()
const timestamp = epoch(dateToday)
console.log( timestamp )
Is there a way to get a time that is local to a specified timezone in JavaScript? Basically, I'm looking for a way to say, what is the ISO time string of 2pm in New York?
I have a hack to do so, where the date is a parse-able date string, and tz is a timezone identifier, such as America/New_York.
function getDateInTZ(date, tz) {
const formatter = new Intl.DateTimeFormat([], {
year: "numeric",
month: "numeric",
day: "numeric",
hour: "numeric",
minute: "numeric",
second: "numeric",
fractionalSecondDigits: 3,
timeZone: tz,
});
const localDate = new Date(date);
const localDateAtTZ = new Date(formatter.format(localDate));
const tzOffset = localDate.getTime() - localDateAtTZ.getTime();
return new Date(localDate.getTime() + tzOffset);
}
and it has the following behavior
getDateInTz("2021-07-01 20:05", "America/Chicago").toISOString(); // 2021-07-02T01:05:00.000Z
getDateInTz(new Date("2021-12-05 20:05"), "America/Chicago").toISOString(); // 2021-12-06T02:05:00.000Z
getDateInTz("2021-12-06T02:05:00.000Z", "America/New_York").toISOString(); // 2021-12-06T02:05:00.000Z if local time is NY
getDateInTz("2021-12-06T02:05:00.000Z", "America/New_York").toISOString(); // 2021-12-06T07:05:00.000Z if local time is UTC
While the above solution works in Chrome, it doesn't work on Firefox because FF is unable to do Date.parse on the output of formatter.format(). Which leads me to think that it's not a correct solution.
Has anyone run into this requirement before, and have a good solution for it?
As far as I know this is not possible without the help of a library like luxon or day.js
In luxon this would be the way to go
let local = luxon.DateTime.local(); // 2021-10-31T20:26:15.093+01:00
let localInCT = local.setZone("America/Chicago"); //2021-10-31T14:26:15.093-05:00
Have a look at this project using these methods
We're limited by the JavaScript native Date object here.
The internal state of a Date object is the number of milliseconds that have elapsed since 1970-01-01 00:00 UTC, and no timezone is stored in the Date object.
So, we can create Dates somewhat equivalent to ones created in another timezone, but they won't behave exactly the same:
The timezone offset for Date.toString() will show the local client timezone (e.g. GMT+0000) rather than the offset in the desired timezone.
DST rules may not work as expected. We can get the equivalent date for say America/New_York, but DST transitions will obey the local timezone rules and not the New York rules.
Having said that, a variant of the approach you're using will give what I would call equivalent dates in the desired timezone.
How we do this:
First use Date.toLocaleString() to format an ISO timestamp in the desired timezone. We use a hack to do this, passing the 'sv' locale to the function. This will create an ISO timestamp, e.g. yyyy-MM-dd HH:mm:ss.
Pass this timestamp to the Date() constructor.
TLDR: This can't really be done. But for some contexts and use cases we can approximate the desired behaviour. I would recommend using a library like luxon for this purpose.
Example below:
function getDateInTimezone(date, timeZone) {
// Using a locale of 'sv' formats as an ISO date, e.g. yyyy-MM-dd HH:mm.
const timeInTimeZone = date.toLocaleString('sv', { timeZone } );
// Pass this to the Date constructor
return new Date(timeInTimeZone);
}
const localTime = new Date();
const timeZoneList = ['Asia/Tokyo', 'Europe/Berlin','America/Los_Angeles'];
console.log(`Local Time: ${localTime.toLocaleTimeString()}`);
for(let timeZone of timeZoneList) {
const dt = getDateInTimezone(localTime, timeZone);
console.log(`Time (${timeZone}): ${dt.toLocaleTimeString()}`);
}
.as-console-wrapper { max-height: 100% !important; top: 0; }
Timezones in luxon are a lot easier to handle, also when we call .toString() on a Luxon DateTime, we get the correct UTC offset.
const { DateTime } = luxon;
const localTime = DateTime.now();
const timeZoneList = ['Asia/Tokyo', 'Europe/Berlin','America/Los_Angeles'];
console.log(`Local Time: ${localTime.toFormat('HH:mm:ssZZ')}`);
for(let zone of timeZoneList) {
const dt = DateTime.fromMillis(Date.now(), { zone });
console.log(`Time (${zone}): ${dt.toFormat(' HH:mm:ssZZ')}`);
}
.as-console-wrapper { max-height: 100% !important; top: 0; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/luxon/2.0.2/luxon.min.js" integrity="sha512-frUCURIeB0OKMPgmDEwT3rC4NH2a4gn06N3Iw6T1z0WfrQZd7gNfJFbHrNsZP38PVXOp6nUiFtBqVvmCj+ARhw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
You can use something like this:
const actualDate = new Date()
actualDate.toLocaleString('en-US', { timeZone: 'America/New_York' })
Does this solve your question?
function getDateInTZ(date, tz) {
return new Date(date).toLocaleString('en-US', { timeZone: tz })
}
console.log(getDateInTZ("2021-07-01 20:05", "Asia/Kolkata"))
console.log(getDateInTZ("2021-07-01 20:05", "America/Chicago"))
console.log(getDateInTZ("2021-12-06T02:05:00.000Z", "America/New_York"))
let date = new Date();
let time = date.toLocaleTimeString([], { hour12: true })
if we are using hour12 true it will return the time in 12h format else it will return the time in 24h format
make sure we are using TZ on .env file it always been a good practice and helps to erase all the extra code.
you can simply use
TZ=America/New_York
I'm trying to do this without adding moment js to my project but it seems more difficult than I'd like.
if I get a date that's formatted as : "2021-07-19T12:15:00-07:00"
Is there an efficient way to have it formatted as:
"12:15 pm"
regardless of where me and my browser are located?
I've gotten as far as some other answers with no luck, for example:
var date = new Date('2021-07-19T12:15:00-07:00')
var userTimezoneOffset = date.getTimezoneOffset() * 60000;
new Date(date.getTime() - userTimezoneOffset);
Thanks!
You could use Date.toLocaleTimeString() to format the time, this will give you the time in the local timezone, if we remove the UTC offset.
There are other options available here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat
let timestampWithUTCOffset = "2021-07-19T12:15:00-07:00";
let timestampWithoutUTCOffset = timestampWithUTCOffset.substr(0,19);
console.log( { timestampWithUTCOffset , timestampWithoutUTCOffset });
let dt = new Date(timestampWithoutUTCOffset);
console.log('Time of day:', dt.toLocaleTimeString('en-US', { timeStyle: 'short' }))
I am trying to convert the below date to a javascript Date() object. When I get it back from the server, it is a Timestamp object,
Screenshot from Firebase Firestore console:
When I try the following on a list of objects returned from firestore:
list.forEach(a => {
var d = a.record.dateCreated;
console.log(d, new Date(d), Date(d))
})
I get this output:
Clearly the Timestamps are all different, and are not all the same date of Sept 09, 2018 (which happens to be today). I'm also not sure why new Date(Timestamp) results in an invalid date. I'm a bit of a JS newbie, am I doing something wrong with the dates or timestamps?
The constructor for a JavaScript's Date doesn't know anything about Firestore's Timestamp objects — it doesn't know what to do with them.
If you want to convert a Timestamp to a Date, use the toDate() method on the Timestamp.
You can use toDate() function along with toDateString() to display the date part alone.
const date = dateCreated.toDate().toDateString()
//Example: Friday Nov 27 2017
Suppose you want only the time part then use the toLocaleTimeString()
const time = dateCreated.toDate().toLocaleTimeString('en-US')
//Example: 01:10:18 AM, the locale part 'en-US' is optional
You can use Timestamp.fromDate and .toDate for converting back and forth.
// Date to Timestamp
const t = firebase.firestore.Timestamp.fromDate(new Date());
// Timestamp to Date
const d = t.toDate();
How to convert Unix timestamp to JavaScript Date object.
var myDate = a.record.dateCreated;
new Date(myDate._seconds * 1000); // access the '_seconds' attribute within the timestamp object
Please use toDate() method and then convert it into the format using angular pipe like this -
{{ row.orderDate.toDate() | date: 'dd MMM hh:mm' }}
apart from other answers you can do it like this as well
//date from firebase is represented as
let time = {
seconds: 1613748319,
nanoseconds: 47688698687,
}
const fireBaseTime = new Date(
time.seconds * 1000 + time.nanoseconds / 1000000,
);
const date = fireBaseTime.toDateString();
const atTime = fireBaseTime.toLocaleTimeString();
console.log(date, atTime);
At last, I could get what I need. This returns date as 08/04/2020
new Date(firebase.firestore.Timestamp.now().seconds*1000).toLocaleDateString()
const timeStampDate = record.createdAt;
const dateInMillis = timeStampDate._seconds * 1000
var date = new Date(dateInMillis).toDateString() + ' at ' + new Date(dateInMillis).toLocaleTimeString()
OutPut Example: Sat 11 Jul 2020 at 21:21:10
This might help:
new Date(firebaseDate._seconds * 1000).toUTCString()
A simple way is to convert firestore timestamp to epoch timestamp is by using toMillis() method on firestore timestamp.
For example:
You have a firestore timestamp
created_on : Timestamp { _seconds: 1622885490, _nanoseconds: 374000000 }
let epochTimestamp = created_on.toMillis()
//epochTimestamp = 1621081015081
//Now this timestamp can be used as usual javascript timestamp which is easy to manipulate.
let date = new Date(epochTimestamp) //date = Sat May 15 2021 17:46:55 GMT+0530 (India Standard Time)
The timestamp object you get from firestore has a toDate() method you can use.
list.forEach(a => {
var d = a.record.dateCreated;
console.log(d.toDate())
})
Here's a quote from firebase docs about the toDate() method
Convert a Timestamp to a JavaScript Date object. This conversion
causes a loss of precision since Date objects only support millisecond
precision.
Returns Date JavaScript Date object representing the same point in
time as this Timestamp, with millisecond precision.
https://firebase.google.com/docs/reference/js/firebase.firestore.Timestamp#todate
This works for me.
new Date(firebaseDate.toDate())
This works for me
let val = firebase.timestamp // as received from the database, the timestamp always comes in an object similar to this - {_nanoseconds: 488484, _seconds: 1635367}
(new Date( (val.time._seconds + val.time._nanoseconds * 10 ** -9) * 1000)).toString().substring(17, 21)
Lots of answer here, but as a rookie I found most of them confusing.
So for rookies like me, here is a simple explanation of how to convert a Firestore date/Timestamp to a Javascript Date() and why you need to.
Why convert?
Firestore stores Dates as a Timestamp object. This is not the same as a Javascript Date() object.
This was confusing to me because if you send a Date() object to Firestore, and then retrieve it, it will hand you back a Timestamp object. Like if you hand Firestore a dollar, it will hand you back 4 quarters. It is the same amount of money (or same date), but if you were expecting paper, and got metal, you would be confused.
How to convert
Luckily the Timestamp object has functions built into do give you a Javascript Date object: toDate
Note: Remember, toDate looks like the Javascript toLocaleDateString() or toDateString() but it is not. A JS Date() object and Firestore Timestamp object are not the same so don't make my rookie mistake of trying to use functions from one, on the other.
To convert a Firestore Timestamp into a Javascript date, just call .toDate() on the Timestamp.
//get the document from Firestore
let fireStoreTimestamp = doc.data().nameOfYourDateField;
let javascriptDate = fireStoreTimestamp.toDate();
You can use the dayjs library to convert firebase firestore timestamp seconds to your local time.
newDate = dayjs.unix(date.seconds).$d;
It will take
date: {
seconds: 1639506600,
nanoseconds: 0
}
and convert it to
Date Sat Nov 16 2019 00:00:00 GMT+0530 (India Standard Time)
To help those still looking around for an answer to convert Firestore Date to JS Date to display in the web app. Here goes an example using typescript...
import {
Timestamp,
} from "firebase/firestore";
interface IStuff {
createdAt: Timestamp;
}
const insertStuff = async (text: string) => {
await addDoc(collection(db, "coolstuff"), {
text,
createdAt: serverTimestamp(),
});
};
<p>{item.createdAt?.toDate().toDateString()}</p>
// OR
<p>{item.createdAt?.toDate().toLocaleTimeString()}</p>
Extending Waleed Tariq answer, to get a more readable string:
function formatDate(date) {
const formatDate = new Date(
date.seconds * 1000 + date.nanoseconds / 1000000
);
return formatDate.toLocaleTimeString('en-us', { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' });
}
const timeStamp = {nanoseconds: 184000000, seconds: 1664826910};
console.log(formatDate(timeStamp))
I had the same problem. And i figured out like this:
const createdAt = firebase.firestore.Timestamp.fromDate(new Date());
// then using dayjs library you can display your date as you want.
const formatDate = dayjs.unix(createdAt.seconds).format('YYYY-MM-DD');
Output should look like e.g. 2020-08-04
If you want don't want to lose the milliseconds you can do the following:
var myDate = a.record.dateCreated;
new Date((myDate.seconds + myDate.nanoseconds * 10 ** -9) * 1000);
i work in angular.
i have an interface and a field date: Date.
the angular pipe date no work: order.date | date:'medium'
i change type of field date in interface
date: firebase.firestore.Timestamp
the angular pipe date work, but with function toDate()
order.date.toDate() | date:'medium'
It's very simple really. Use this simple epoch converter function which converts epoch seconds into Javascript date and time.
function getUNIXTime(dt) {
let unix = new Date(dt * 1000);
return unix.toUTCString().slice(5, 16);
}
Pass the timestamp.seconds into this function then slice it according to your needs to get a string of text with date and time.
Normally using any type (i.e. loginDate:any) and toDate() worked without problem in my all projects. But in my last project it didn't. I saw seconds in Timestamp object is _seconds anymore (Firebase 8.6.8). This type of change may have affected it. I don't know but i had no time so i used an alternative solution. A custom pipe. It can be used as an alternative:
import { Pipe, PipeTransform } from '#angular/core';
import { formatDate } from '#angular/common';
#Pipe({
name: 'timestamp'
})
export class TimestampPipe implements PipeTransform {
transform(value: any, format?: string) {
if (!value) { return ''; }
if (!format) { format = 'dd MMM yy'; }
return formatDate(value._seconds * 1000, format, 'tr');
}
}
and
{{ item.endDate | timestamp}}
P.S. Type is not important with this pipe. Worked with loginDate:any or loginDate:Date well.
to store timestamp into firestore:
import * as firebaseAdmin from "firebase-admin";
const created = firebaseAdmin.firestore.FieldValue.serverTimestamp();
// type
created: FirebaseFirestore.Timestamp | FirebaseFirestore.FieldValue | undefined;
To read back as a js Date object
const createDate = (created as FirebaseFirestore.Timestamp).toDate();
To read back as RFC3339 string
const createDate = (created as FirebaseFirestore.Timestamp).toDate().toISOString();
Web Firestore Timestamp:
function dateToFirestoreTimestamp(dateString = ''){
var timestampDate = new Date(); // this will return current date-time
if(dateString != ''){
// this will return timestamp according to provided date-time
dateString = dateString.replace(' ', 'T');
timestampDate = new Date(dateString);
}
timestampDate = firebase.firestore.Timestamp.fromDate(timestampDate);
return timestampDate;
}
This is by far the most elegant, precise and easiest way to convert a firebase-timestamp to a date (no dependenceis etc. needed)
const date = new Intl.DateTimeFormat(
'de-De', {
year: 'numeric',
month: 'numeric',
day: 'numeric',
hour: 'numeric',
minute: 'numeric'
}
).format(firebaseTimeStamp.toDate())
Here is a cheatsheet with all necesarry parameters
this is the different thing between firestore timestamp and Javascript Date() object. if you want to use javascript Date() object from firestore timestamp, this is what I do:
const foo = new Date(firestoreTimestamp.toDate());
then you can use the javascript Date() object, as usual. here are some references:
https://www.w3schools.com/jsref/jsref_obj_date.asp
For example, we want to retrieve the date from the Date() object with string format:
const foo = new Date(firestoreTimestamp.toDate());
foo.toLocaleDateString();
etc.
I have something like /Date(1370001284000+0200)/ as timestamp. I guess it is a unix date, isn't it? How can I convert this to a date like this: 31.05.2013 13:54:44
I tried THIS converter for 1370001284 and it gives the right date. So it is in seconds.
But I still get the wrong date for:
var substring = unix_timestamp.replace("/Date(", "");
substring = substring.replace("000+0200)/", "");
var date = new Date();
date.setSeconds(substring);
return date;
Note my use of t.format comes from using Moment.js, it is not part of JavaScript's standard Date prototype.
A Unix timestamp is the number of seconds since 1970-01-01 00:00:00 UTC.
The presence of the +0200 means the numeric string is not a Unix timestamp as it contains timezone adjustment information. You need to handle that separately.
If your timestamp string is in milliseconds, then you can use the milliseconds constructor and Moment.js to format the date into a string:
var t = new Date( 1370001284000 );
var formatted = moment(t).format("dd.mm.yyyy hh:MM:ss");
If your timestamp string is in seconds, then use setSeconds:
var t = new Date();
t.setSeconds( 1370001284 );
var formatted = moment(t).format("dd.mm.yyyy hh:MM:ss");
Looks like you might want the ISO format so that you can retain the timezone.
var dateTime = new Date(1370001284000);
dateTime.toISOString(); // Returns "2013-05-31T11:54:44.000Z"
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
Without moment.js:
var time_to_show = 1509968436; // unix timestamp in seconds
var t = new Date(time_to_show * 1000);
var formatted = ('0' + t.getHours()).slice(-2) + ':' + ('0' + t.getMinutes()).slice(-2);
document.write(formatted);
The /Date(ms + timezone)/ is a ASP.NET syntax for JSON dates. You might want to use a library like momentjs for parsing such dates. It would come in handy if you need to manipulate or print the dates any time later.
If using react:
import Moment from 'react-moment';
Moment.globalFormat = 'D MMM YYYY';
then:
<td><Moment unix>{1370001284}</Moment></td>
Import moment js:
var fulldate = new Date(1370001284000);
var converted_date = moment(fulldate).format(");
if you're using React I found 'react-moment' library more easy to handle for Front-End related tasks, just import <Moment> component and add unix prop:
import Moment from 'react-moment'
// get date variable
const {date} = this.props
<Moment unix>{date}</Moment>
I would like to add that Using the library momentjs in javascript you can have the whole data information in an object with:
const today = moment(1557697070824.94).toObject();
You should obtain an object with this properties:
today: {
date: 15,
hours: 2,
milliseconds: 207,
minutes: 31,
months: 4
seconds: 22,
years: 2019
}
It is very useful when you have to calculate dates.
for people as dumb as myself, my date was in linux epoch
but it was a string instead of an integer, and that's why i was getting
RangeError: Date value out of bounds
so if you are getting the epoch from an api, parseInt it first
var dateTime = new Date(parseInt(1370001284000));
dateTime.toISOString();