bubasuma\simplechat\models\Message::formatDate PHP Method

    public static function formatDate($value)
    {
        $today = date_create()->setTime(0, 0, 0);
        $date = date_create($value)->setTime(0, 0, 0);
        if ($today == $date) {
            $label = 'Today';
        } elseif ($today->getTimestamp() - $date->getTimestamp() == 24 * 60 * 60) {
            $label = 'Yesterday';
        } elseif ($today->format('W') == $date->format('W') && $today->format('Y') == $date->format('Y')) {
            $label = \Yii::$app->formatter->asDate($value, 'php:l');
        } elseif ($today->format('Y') == $date->format('Y')) {
            $label = \Yii::$app->formatter->asDate($value, 'php:d F');
        } else {
            $label = \Yii::$app->formatter->asDate($value, 'medium');
        }
        $formatted = \Yii::$app->formatter->asTime($value, 'short');
        return [$label, $formatted];
    }