DateTime.php

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<?php
namespace Magento\Framework\Stdlib;

class DateTime
{
    const DATETIME_INTERNAL_FORMAT = 'yyyy-MM-dd HH:mm:ss';

    const DATE_INTERNAL_FORMAT = 'yyyy-MM-dd';

    const DATETIME_PHP_FORMAT = 'Y-m-d H:i:s';

    const DATE_PHP_FORMAT = 'Y-m-d';

    const YEAR_MIN_VALUE = -10000;

    const YEAR_MAX_VALUE = 10000;

    public function formatDate($date, $includeTime = true)
    {
        if ($date instanceof \DateTimeInterface) {
            $format = $includeTime ? self::DATETIME_PHP_FORMAT : self::DATE_PHP_FORMAT;
            return $date->format($format);
        } elseif (empty($date)) {
            return null;
        } elseif ($date === true) {
            $date = (new \DateTime())->getTimestamp();
        } elseif (!is_numeric($date)) {
            $date = (new \DateTime($date))->getTimestamp();
        }

        $format = $includeTime ? self::DATETIME_PHP_FORMAT : self::DATE_PHP_FORMAT;
        return (new \DateTime())->setTimestamp($date)->format($format);
    }

    public function isEmptyDate($date)
    {
        return preg_replace('#[ 0:-]#', '', $date) === '';
    }

    public function gmDate($format, $time)
    {
        return gmdate($format, $time);
    }

    public function strToTime($timeStr)
    {
        return strtotime($timeStr);
    }
}