Deprecation warning in Moment.js - Not in a recognized ISO format

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Here is where they discuss the Warning Message.

String + Format

Warning: Browser support for parsing strings is inconsistent. Because there is no specification on which formats should be supported, what works in some browsers will not work in other browsers. For consistent results parsing anything other than ISO 8601 strings, you should use String + Format.

moment("12-25-1995", "MM-DD-YYYY");

String + Formats (multiple formats)

If you have more than one format, check out their String + Formats (with an 's').

If you don't know the exact format of an input string, but know it could be one of many, you can use an array of formats.

moment("12-25-1995", ["MM-DD-YYYY", "YYYY-MM-DD"]);

Please checkout the documentation for anything more specific.

Timezone

Checkout Parsing in Zone, the equivalent documentation for timezones.

The moment.tz constructor takes all the same arguments as the moment constructor, but uses the last argument as a time zone identifier.

var b = moment.tz("May 12th 2014 8PM", "MMM Do YYYY hA", "America/Toronto");

EDIT

//...
var dateFormat = "YYYY-M-D H:m"; //<-------- This part will get rid of the warning.
var aus1_s, aus2_s, aus3_s, aus4_s, aus5_s, aus6_s, aus6_e;
if ($("#custom1 :selected").val() == "AU" ) {
    var region = 'Australia/Sydney';

    aus1_s = moment.tz('2016-9-26 19:30', dateFormat, region);              
    aus2_s = moment.tz('2016-10-2 19:30', dateFormat, region);              
    aus3_s = moment.tz('2016-10-9 19:30', dateFormat, region);                  
    aus4_s = moment.tz('2016-10-16 19:30', dateFormat, region);                 
    aus5_s = moment.tz('2016-10-23 19:30', dateFormat, region);
    aus6_s = moment.tz('2016-10-30 19:30', dateFormat, region);
    aus6_e = moment.tz('2016-11-5 19:30', dateFormat, region);
} else if ($("#custom1 :selected").val() == "NZ" ) {
    var region = 'Pacific/Auckland';

    aus1_s =  moment.tz('2016-9-28 20:30', dateFormat, region);
    aus2_s =  moment.tz('2016-10-4 20:30', dateFormat, region);
    aus3_s =  moment.tz('2016-10-11 20:30', dateFormat, region);
    aus4_s =  moment.tz('2016-10-18 20:30', dateFormat, region);
    aus5_s =  moment.tz('2016-10-25 20:30', dateFormat, region);
    aus6_s =  moment.tz('2016-11-2 20:30', dateFormat, region);
    aus6_e =  moment.tz('2016-11-9 20:30', dateFormat, region);
}
//...

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Doing this works for me:

moment(new Date("27/04/2016")).format

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use moment in your function like this

 moment(new Date(date)).format('MM/DD/YYYY')

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I ran into this error because I was trying to pass in a date from localStorage. Passing the date into a new Date object, and then calling .toISOString() did the trick for me:

const dateFromStorage = localStorage.getItem('someDate');
const date = new Date(dateFromStorage);
const momentDate = moment(date.toISOString());

This suppressed any warnings in the console.

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You can use

moment(date,"currentFormat").format("requiredFormat");

This should be used when date is not ISO Format as it'll tell moment what our current format is.

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This answer is to give a better understanding of this warning

Deprecation warning is caused when you use moment to create time object, var today = moment();.

If this warning is okay with you then I have a simpler method.

Don't use date object from js use moment instead. For example use moment() to get the current date.

Or convert the js date object to moment date. You can simply do that specifying the format of your js date object.

ie, moment("js date", "js date format");

eg:

moment("2014 04 25", "YYYY MM DD");

(BUT YOU CAN ONLY USE THIS METHOD UNTIL IT'S DEPRECIATED, this may be depreciated from moment in the future)

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Parsing string with moment.js.

const date = '1231231231231' //Example String date
const parsed = moment(+date);

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Add the following line in your code to Suppress the warnings:

const moment = require('moment');

moment.suppressDeprecationWarnings = true;

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A simple answer:

let date = Date.now();
let timeNow = moment(new Date(date)).format('YYYY-MM-DD');

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In my case, this error happens when

moment('2021-07-1')

The correct way is

moment('2021-07-01')

When the month/date is less than 10, you need to add 0 in front.

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I was using moment to convert my date value to the format I want. The date value from the database is like

2021-06-07T22:00:00.000Z

What I did is as below:

dateNeeded = moment(dateNeeded , moment.ISO_8601).format('YYYY-MM-DD');

The reference is here: https://momentjs.com/docs/#/parsing/string-format/

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This may be a bit overdue. My issue was I did not have a format at all being passed from the database ( mine was NULL ).

The docs say: This deprecation warning is thrown when no known format is found for a date passed into the string constructor. To work around this issue, specify a format for the string being passed to moment().

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I have similar issue faced and solve with following solution: my date format is: 'Fri Dec 11 2020 05:00:00 GMT+0500 (Pakistan Standard Time)'

let currentDate = moment(new Date('Fri Dec 11 2020 05:00:00 GMT+0500 (Pakistan Standard Time)').format('DD-MM-YYYY'); // 'Fri Dec 11 2020 05:00:00 GMT+0500 (Pakistan Standard Time)'

let output=(moment(currentDate).isSameOrAfter('07-12-2020'));

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const dateFormat = 'MM-DD-YYYY';

const currentDateStringType = moment(new Date()).format(dateFormat);
    
const currentDate = moment(new Date() ,dateFormat);  // use this 

moment.suppressDeprecationWarnings = true;

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 var nowTime = moment();

 var nowTimeFormate = moment(nowTime).format("HH:mm");

 console.log('from now time',nowTimeFormate)

this syntax help me to avoid warning

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