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Editing: DateTimeResult.php

<?php

namespace Aws\Api;

use Aws\Api\Parser\Exception\ParserException;
use DateTime;
use DateTimeZone;
use Exception;

/**
 * DateTime overrides that make DateTime work more seamlessly as a string,
 * with JSON documents, and with JMESPath.
 */
class DateTimeResult extends \DateTime implements \JsonSerializable
{
    private const ISO8601_NANOSECOND_REGEX = '/^(.*\.\d{6})(\d{1,3})(Z|[+-]\d{2}:\d{2})?$/';

/**
     * Create a new DateTimeResult from a unix timestamp.
     * The Unix epoch (or Unix time or POSIX time or Unix
     * timestamp) is the number of seconds that have elapsed since
     * January 1, 1970 (midnight UTC/GMT).
     *
     * @return DateTimeResult
     * @throws Exception
     */
    public static function fromEpoch($unixTimestamp)
    {
        if (!is_numeric($unixTimestamp)) {
            throw new ParserException('Invalid timestamp value passed to DateTimeResult::fromEpoch');
        }

// PHP 5.5 does not support sub-second precision
        if (\PHP_VERSION_ID < 56000) {
            return new self(gmdate('c', $unixTimestamp));
        }

$decimalSeparator = isset(localeconv()['decimal_point']) ? localeconv()['decimal_point'] : ".";
        $formatString = "U" . $decimalSeparator . "u";
        $dateTime = DateTime::createFromFormat(
            $formatString,
            sprintf('%0.6f', $unixTimestamp),
            new DateTimeZone('UTC')
        );

if (false === $dateTime) {
            throw new ParserException('Invalid timestamp value passed to DateTimeResult::fromEpoch');
        }

return new self(
            $dateTime->format('Y-m-d H:i:s.u'),
            new DateTimeZone('UTC')
        );
    }

/**
     * @return DateTimeResult
     */
    public static function fromISO8601($iso8601Timestamp)
    {
        if (is_numeric($iso8601Timestamp) || !is_string($iso8601Timestamp)) {
            throw new ParserException('Invalid timestamp value passed to DateTimeResult::fromISO8601');
        }

// Prior to 8.0.10, nanosecond precision is not supported
        // Reduces to microsecond precision if nanosecond precision is detected
        if (PHP_VERSION_ID < 80010
            && preg_match(self::ISO8601_NANOSECOND_REGEX, $iso8601Timestamp, $matches)
        ) {
            $iso8601Timestamp = $matches[1] . ($matches[3] ?? '');
        }

return new DateTimeResult($iso8601Timestamp);
    }

/**
     * Create a new DateTimeResult from an unknown timestamp.
     *
     * @return DateTimeResult
     * @throws Exception
     */
    public static function fromTimestamp($timestamp, $expectedFormat = null)
    {
        if (empty($timestamp)) {
            return self::fromEpoch(0);
        }

if (!(is_string($timestamp) || is_numeric($timestamp))) {
            throw new ParserException('Invalid timestamp value passed to DateTimeResult::fromTimestamp');
        }

try {
            if ($expectedFormat == 'iso8601') {
                try {
                    return self::fromISO8601($timestamp);
                } catch (Exception $exception) {
                    return self::fromEpoch($timestamp);
                }
            } else if ($expectedFormat == 'unixTimestamp') {
                try {
                    return self::fromEpoch($timestamp);
                } catch (Exception $exception) {
                    return self::fromISO8601($timestamp);
                }
            } else if (\Aws\is_valid_epoch($timestamp)) {
                return self::fromEpoch($timestamp);
            }
            return self::fromISO8601($timestamp);
        } catch (Exception $exception) {
            throw new ParserException('Invalid timestamp value passed to DateTimeResult::fromTimestamp');
        }
    }

/**
     * Serialize the DateTimeResult as an ISO 8601 date string.
     *
     * @return string
     */
    public function __toString()
    {
        return $this->format('c');
    }

/**
     * Serialize the date as an ISO 8601 date when serializing as JSON.
     *
     * @return string
     */
    #[\ReturnTypeWillChange]
    public function jsonSerialize()
    {
        return (string) $this;
    }
}

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