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<?php
/**
* This file is part of the Carbon package.
*
* (c) Brian Nesbitt <brian@nesbot.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Carbon;
use Carbon\Exceptions\InvalidCastException;
use Carbon\Exceptions\InvalidTimeZoneException;
use DateTimeInterface;
use DateTimeZone;
use Throwable;
class CarbonTimeZone extends DateTimeZone
{
public function __construct($timezone = null)
{
parent::__construct(static::getDateTimeZoneNameFromMixed($timezone));
}
protected static function parseNumericTimezone($timezone)
{
if ($timezone <= -100 || $timezone >= 100) {
throw new InvalidTimeZoneException('Absolute timezone offset cannot be greater than 100.');
}
return ($timezone >= 0 ? '+' : '').$timezone.':00';
}
protected static function getDateTimeZoneNameFromMixed($timezone)
{
if ($timezone === null) {
return date_default_timezone_get();
}
if (\is_string($timezone)) {
$timezone = preg_replace('/^\s*([+-]\d+)(\d{2})\s*$/', '$1:$2', $timezone);
}
if (is_numeric($timezone)) {
return static::parseNumericTimezone($timezone);
}
return $timezone;
}
protected static function getDateTimeZoneFromName(&$name)
{
return @timezone_open($name = (string) static::getDateTimeZoneNameFromMixed($name));
}
/**
* Cast the current instance into the given class.
*
* @param string $className The $className::instance() method will be called to cast the current object.
*
* @return DateTimeZone
*/
public function cast(string $className)
{
if (!method_exists($className, 'instance')) {
if (is_a($className, DateTimeZone::class, true)) {
return new $className($this->getName());
}
throw new InvalidCastException("$className has not the instance() method needed to cast the date.");
}
return $className::instance($this);
}
/**
* Create a CarbonTimeZone from mixed input.
*
* @param DateTimeZone|string|int|null $object original value to get CarbonTimeZone from it.
* @param DateTimeZone|string|int|null $objectDump dump of the object for error messages.
*
* @throws InvalidTimeZoneException
*
* @return false|static
*/
public static function instance($object = null, $objectDump = null)
{
$tz = $object;
if ($tz instanceof static) {
return $tz;
}
if ($tz === null) {
return new static();
}
if (!$tz instanceof DateTimeZone) {
$tz = static::getDateTimeZoneFromName($object);
}
if ($tz === false) {
if (Carbon::isStrictModeEnabled()) {
throw new InvalidTimeZoneException('Unknown or bad timezone ('.($objectDump ?: $object).')');
}
return false;
}
return new static($tz->getName());
}
/**
* Returns abbreviated name of the current timezone according to DST setting.
*
* @param bool $dst
*
* @return string
*/
public function getAbbreviatedName($dst = false)
{
$name = $this->getName();
foreach ($this->listAbbreviations() as $abbreviation => $zones) {
foreach ($zones as $zone) {
if ($zone['timezone_id'] === $name && $zone['dst'] == $dst) {
return $abbreviation;
}
}
}
return 'unknown';
}
/**
* @alias getAbbreviatedName
*
* Returns abbreviated name of the current timezone according to DST setting.
*
* @param bool $dst
*
* @return string
*/
public function getAbbr($dst = false)
{
return $this->getAbbreviatedName($dst);
}
/**
* Get the offset as string "sHH:MM" (such as "+00:00" or "-12:30").
*
* @param DateTimeInterface|null $date
*
* @return string
*/
public function toOffsetName(DateTimeInterface $date = null)
{
return static::getOffsetNameFromMinuteOffset(
$this->getOffset($date ?: Carbon::now($this)) / 60
);
}
/**
* Returns a new CarbonTimeZone object using the offset string instead of region string.
*
* @param DateTimeInterface|null $date
*
* @return CarbonTimeZone
*/
public function toOffsetTimeZone(DateTimeInterface $date = null)
{
return new static($this->toOffsetName($date));
}
/**
* Returns the first region string (such as "America/Toronto") that matches the current timezone or
* false if no match is found.
*
* @see timezone_name_from_abbr native PHP function.
*
* @param DateTimeInterface|null $date
* @param int $isDst
*
* @return string|false
*/
public function toRegionName(DateTimeInterface $date = null, $isDst = 1)
{
$name = $this->getName();
$firstChar = substr($name, 0, 1);
if ($firstChar !== '+' && $firstChar !== '-') {
return $name;
}
$date = $date ?: Carbon::now($this);
// Integer construction no longer supported since PHP 8
// @codeCoverageIgnoreStart
try {
$offset = @$this->getOffset($date) ?: 0;
} catch (Throwable $e) {
$offset = 0;
}
// @codeCoverageIgnoreEnd
$name = @timezone_name_from_abbr('', $offset, $isDst);
if ($name) {
return $name;
}
foreach (timezone_identifiers_list() as $timezone) {
if (Carbon::instance($date)->tz($timezone)->getOffset() === $offset) {
return $timezone;
}
}
return false;
}
/**
* Returns a new CarbonTimeZone object using the region string instead of offset string.
*
* @param DateTimeInterface|null $date
*
* @return CarbonTimeZone|false
*/
public function toRegionTimeZone(DateTimeInterface $date = null)
{
$tz = $this->toRegionName($date);
if ($tz === false) {
if (Carbon::isStrictModeEnabled()) {
throw new InvalidTimeZoneException('Unknown timezone for offset '.$this->getOffset($date ?: Carbon::now($this)).' seconds.');
}
return false;
}
return new static($tz);
}
/**
* Cast to string (get timezone name).
*
* @return string
*/
public function __toString()
{
return $this->getName();
}
/**
* Create a CarbonTimeZone from mixed input.
*
* @param DateTimeZone|string|int|null $object
*
* @return false|static
*/
public static function create($object = null)
{
return static::instance($object);
}
/**
* Create a CarbonTimeZone from int/float hour offset.
*
* @param float $hourOffset number of hour of the timezone shift (can be decimal).
*
* @return false|static
*/
public static function createFromHourOffset(float $hourOffset)
{
return static::createFromMinuteOffset($hourOffset * Carbon::MINUTES_PER_HOUR);
}
/**
* Create a CarbonTimeZone from int/float minute offset.
*
* @param float $minuteOffset number of total minutes of the timezone shift.
*
* @return false|static
*/
public static function createFromMinuteOffset(float $minuteOffset)
{
return static::instance(static::getOffsetNameFromMinuteOffset($minuteOffset));
}
/**
* Convert a total minutes offset into a standardized timezone offset string.
*
* @param float $minutes number of total minutes of the timezone shift.
*
* @return string
*/
public static function getOffsetNameFromMinuteOffset(float $minutes): string
{
$minutes = round($minutes);
$unsignedMinutes = abs($minutes);
return ($minutes < 0 ? '-' : '+').
str_pad((string) floor($unsignedMinutes / 60), 2, '0', STR_PAD_LEFT).
':'.
str_pad((string) ($unsignedMinutes % 60), 2, '0', STR_PAD_LEFT);
}
}