Magento 2 Date of Birth validation issue of customer registration field.

Please find the validation.js file in the vendor directory.

vendor/magento/module-customer/view/frontend/web/js/validation.js

Override validation.js file to your theme.

Replace the below code

define([
    'jquery',
    'moment',
    'jquery/validate',
    'mage/translate'
], function ($, moment) {
    'use strict';

    $.validator.addMethod(
        'validate-dob',
        function (value) {
            if (value === '') {
                return true;
            }

            return moment(value).isBefore(moment());
        },
        $.mage.__('The Date of Birth should not be greater than today.')
    );
});

define([

'jquery',

'moment',

'jquery/validate',

'mage/translate'

], function ($, moment) {

'use strict';

$.validator.addMethod(

'validate-dob',

function (value) {

if (value === '') {

return true;

}

return moment(value).isBefore(moment());

$.mage.__('The Date of Birth should not be greater than today.')

);

});

with the below code

define([
    'jquery',
    'moment',
    'mageUtils',
    'jquery/validate',
    'validation',
    'mage/translate'
], function ($, moment, utils) {
    'use strict';

    $.validator.addMethod(
        'validate-dob',
        function (value, element, params) {
            var dateFormat = utils.convertToMomentFormat(params.dateFormat);

            if (value === '') {
                return true;
            }

            return moment(value, dateFormat).isBefore(moment());
        },
        $.mage.__('The Date of Birth should not be greater than today.')
    );
});

define([

'jquery',

'moment',

'mageUtils',

'jquery/validate',

'validation',

'mage/translate'

], function ($, moment, utils) {

'use strict';

$.validator.addMethod(

'validate-dob',

function (value, element, params) {

var dateFormat = utils.convertToMomentFormat(params.dateFormat);

if (value === '') {

return true;

}

return moment(value, dateFormat).isBefore(moment());

$.mage.__('The Date of Birth should not be greater than today.')

);

});

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