How can I call a function of a helper class in a view - Laravel 5.8?

I have a helper class DateHelper

I have one fn in there

public static function getAgo($date) {

    if ($date) {

        $ts = time() - strtotime(str_replace("-","/",$date));

        if($ts>31536000) $val = round($ts/31536000,0).' year';
        else if($ts>2419200) $val = round($ts/2419200,0).' month';
        else if($ts>604800) $val = round($ts/604800,0).' week';
        else if($ts>86400) $val = round($ts/86400,0).' day';
        else if($ts>3600) $val = round($ts/3600,0).' hour';
        else if($ts>60) $val = round($ts/60,0).' minute';
        else $val = $ts.' second';

        if($val>1) $val .= 's';

        return $val;


    }

}

I want to use it in my view like this

I kept getting

Class 'DateHelper' not found (View: ...

I tried to include it on top of my index.blade.php like this

<?php use App\DateHelper; ?>

Can someone please help me ?

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