Fix date of birthday validation issue

[selusi]

Preconditions

1. PHP 7.0.22
2. Apache2
3. MySql5.6
4. Magento 2.2.0

Steps to reproduce

1. In backend Stores->Configuration->General->General->Locale options set locale as English (United States)
2. In backend Stores->Configuration->Customer->Customer configuration->Name and address options set Show Date of Birth as optional or required
3. In frontend open the page to create a new account and compile all fields and insert a date of birthday in format mm/dd/yyyy

Expected result

1. Pass validation and create new account

Actual result

1. Date of birthday doesn't pass validation because the format is wrong
2. To pass validation You have to insert date in dd/mm/yyyy format

To fix the issue

The issue is a validation rule setted at line 212 of

vendor\magento\module-customer\Block\Widget\Dob.php

To fix the issue I have modified the method getHtmlExtraParams() to use the appropriate rule based on locale settings.
The original method

    public function getHtmlExtraParams()
    {
        $extraParams = [
            "'validate-date-au':true"
        ];

        if ($this->isRequired()) {
            $extraParams[] = 'required:true';
        }

        $extraParams = implode(', ', $extraParams);

        return 'data-validate="{' . $extraParams . '}"';
    }

New modified method

    public function getHtmlExtraParams()
    {
        /* NEW LINES */
        $firstDateLetter = substr(strtolower($this->getDateFormat()), 0, 1);
        if( $firstDateLetter == 'm'){
	    $rule = 'validate-date'; /* Rule for mm/dd/yyyy date format */
	} else{
	    $rule = 'validate-date-au'; /* Rule for dd/mm/yyyy date format */
	}
        /* END NEW LINES */
	$extraParams = [
            "'".$rule."':true" /* MODIFIED LINE */
        ];
      
        if ($this->isRequired()) {
            $extraParams[] = 'required:true';
        }

        $extraParams = implode(', ', $extraParams);

        return 'data-validate="{' . $extraParams . '}"';
    }

[valentinboyanov]

I am working on it at #mm17es

[valentinboyanov]

The current issue was solved by the fixed issue #11067.

[magento-engcom-team]

@selusi, thank you for your report.
We've created internal ticket(s) MAGETWO-83300 to track progress on the issue.

[okorshenko]

Fixed in 2.2-develop

[SundarAkula]

Hi there, Can you please help with DOB validation. I want to restrict the customer based on 18 years.

[Paksifules95]

Hi there, Can you please help with DOB validation. I want to restrict the customer based on 18 years.

Hi SundarAkula, you have a solution to this problem?