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/*
* This file is part of the ICanBoogie package.
*
* (c) Olivier Laviale <olivier.laviale@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace ICanBoogie\HTTP\Headers;
use ICanBoogie\DateTime;
/**
* A date time object that renders into a string formatted for HTTP header fields.
*
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3.1
*/
class Date extends DateTime
{
static public function from($source, $timezone=null)
{
if ($source === null)
{
return static::none();
}
return parent::from($source, $timezone);
}
/**
* Constructor.
*
* @param string|int|\DateTime $time If time is provided as a numeric value it is used as
* "@{$time}" and the time zone is set to UTC.
* @param \DateTimeZone|string $timezone A {@link \DateTimeZone} object representing the desired
* time zone. If the time zone is empty `utc` is used instead.
*/
public function __construct($time='now', $timezone=null)
{
if ($time instanceof \DateTime)
{
$time = $time->getTimestamp();
}
if (is_numeric($time))
{
$time = '@' . $time;
$timezone = null;
}
parent::__construct($time, $timezone ?: 'utc');
}
/**
* Formats the instance according to the RFC 1123.
*/
public function __toString()
{
return $this->is_empty ? '' : $this->utc->as_rfc1123;
}
}