Time.php

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<?php
namespace Magento\Framework\Data\Form\Element;

use Magento\Framework\Escaper;

class Time extends AbstractElement
{
    public function __construct(
        Factory $factoryElement,
        CollectionFactory $factoryCollection,
        Escaper $escaper,
        $data = []
    ) {
        parent::__construct($factoryElement, $factoryCollection, $escaper, $data);
        $this->setType('time');
    }

    public function getName()
    {
        $name = parent::getName();
        if (strpos($name, '[]') === false) {
            $name .= '[]';
        }
        return $name;
    }

    public function getElementHtml()
    {
        $this->addClass('select admin__control-select');

        $valueHrs = 0;
        $valueMin = 0;
        $valueSec = 0;

        if ($value = $this->getValue()) {
            $values = explode(',', $value);
            if (is_array($values) && count($values) == 3) {
                $valueHrs = $values[0];
                $valueMin = $values[1];
                $valueSec = $values[2];
            }
        }

        $html = '<input type="hidden" id="' . $this->getHtmlId() . '" ' . $this->_getUiId() . '/>';
        $html .= '<select name="' . $this->getName() . '" style="width:80px" '
            . $this->serialize($this->getHtmlAttributes())
            . $this->_getUiId('hour') . '>' . "\n";
        for ($i = 0; $i < 24; $i++) {
            $hour = str_pad($i, 2, '0', STR_PAD_LEFT);
            $html .= '<option value="' . $hour . '" ' . ($valueHrs ==
                $i ? 'selected="selected"' : '') . '>' . $hour . '</option>';
        }
        $html .= '</select>' . "\n";

        $html .= ':&nbsp;<select name="' . $this->getName() . '" style="width:80px" '
            . $this->serialize($this->getHtmlAttributes())
            . $this->_getUiId('minute') . '>' . "\n";
        for ($i = 0; $i < 60; $i++) {
            $hour = str_pad($i, 2, '0', STR_PAD_LEFT);
            $html .= '<option value="' . $hour . '" ' . ($valueMin ==
                $i ? 'selected="selected"' : '') . '>' . $hour . '</option>';
        }
        $html .= '</select>' . "\n";

        $html .= ':&nbsp;<select name="' . $this->getName() . '" style="width:80px" '
            . $this->serialize($this->getHtmlAttributes())
            . $this->_getUiId('second') . '>' . "\n";
        for ($i = 0; $i < 60; $i++) {
            $hour = str_pad($i, 2, '0', STR_PAD_LEFT);
            $html .= '<option value="' . $hour . '" ' . ($valueSec ==
                $i ? 'selected="selected"' : '') . '>' . $hour . '</option>';
        }
        $html .= '</select>' . "\n";
        $html .= $this->getAfterElementHtml();
        return $html;
    }
}