<?php
namespace JsonSchema;
class Rfc3339
{
const REGEX = '/^(\d{4}-\d{2}-\d{2}[T ]{1}\d{2}:\d{2}:\d{2})(\.\d+)?(Z|([+-]\d{2}):?(\d{2}))$/';
/**
* Try creating a DateTime instance
*
* @param string $string
*
* @return \DateTime|null
*/
public static function createFromString($string)
{
if (!preg_match(self::REGEX, strtoupper($string), $matches)) {
return null;
}
$dateAndTime = $matches[1];
$microseconds = $matches[2] ?: '.000000';
$timeZone = 'Z' !== $matches[3] ? $matches[4] . ':' . $matches[5] : '+00:00';
$dateFormat = strpos($dateAndTime, 'T') === false ? 'Y-m-d H:i:s.uP' : 'Y-m-d\TH:i:s.uP';
$dateTime = \DateTime::createFromFormat($dateFormat, $dateAndTime . $microseconds . $timeZone, new \DateTimeZone('UTC'));
return $dateTime ?: null;
}
}