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DateTime.php
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DateTime.php
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<?php
namespace Icecave\Chrono;
use Icecave\Chrono\Support\Normalizer;
use Icecave\Chrono\TypeCheck\TypeCheck;
/**
* Represents a date/time.
*/
class DateTime implements TimePointInterface, TimeInterface
{
/**
* @param integer $year The year component of the date.
* @param integer $month The month component of the date.
* @param integer $day The day component of the date.
* @param integer $hours The hours component of the time.
* @param integer $minutes The minutes component of the time.
* @param integer $seconds The seconds component of the time.
* @param TimeZone|null $timeZone The time zone of the time, or null to use UTC.
*/
public function __construct(
$year,
$month,
$day,
$hours = 0,
$minutes = 0,
$seconds = 0,
TimeZone $timeZone = null
) {
$this->typeCheck = TypeCheck::get(__CLASS__, func_get_args());
Normalizer::normalizeTime($hours, $minutes, $seconds, $day);
Normalizer::normalizeDate($year, $month, $day);
if ($timeZone === null) {
$timeZone = new TimeZone;
}
$this->year = $year;
$this->month = $month;
$this->day = $day;
$this->hours = $hours;
$this->minutes = $minutes;
$this->seconds = $seconds;
$this->timeZone = $timeZone;
}
/**
* @return integer The year component of the date.
*/
public function year()
{
$this->typeCheck->year(func_get_args());
return $this->year;
}
/**
* @return integer The month component of the date.
*/
public function month()
{
$this->typeCheck->month(func_get_args());
return $this->month;
}
/**
* @return integer The day component of the date.
*/
public function day()
{
$this->typeCheck->day(func_get_args());
return $this->day;
}
/**
* @return integer The hours component of the time.
*/
public function hours()
{
$this->typeCheck->hours(func_get_args());
return $this->hours;
}
/**
* @return integer The minutes component of the time.
*/
public function minutes()
{
$this->typeCheck->minutes(func_get_args());
return $this->minutes;
}
/**
* @return integer The seconds component of the time.
*/
public function seconds()
{
$this->typeCheck->seconds(func_get_args());
return $this->seconds;
}
/**
* Convert this time to a different timezone.
*
* Note that this method returns a {@see DateTime} instance, and not a {@see Date}.
*
* @param TimeZone $timeZone The target timezone
*
* @return DateTime
*/
public function toTimeZone(TimeZone $timeZone)
{
$this->typeCheck->toTimeZone(func_get_args());
if ($this->timeZone()->compare($timeZone) === 0) {
return $this;
}
$offset = $timeZone->offset()
- $this->timeZone()->offset();
return new DateTime(
$this->year(),
$this->month(),
$this->day(),
$this->hours(),
$this->minutes(),
$this->seconds() + $offset
);
}
/**
* Convert this time to the UTC timezone.
*
* Note that this method returns a {@see DateTime} instance, and not a {@see Date}.
*
* @return DateTime
*/
public function toUtc()
{
$this->typeCheck->toUtc(func_get_args());
return $this->toTimeZone(new TimeZone);
}
/**
* @return TimeZone The time zone of the time.
*/
public function timeZone()
{
$this->typeCheck->timeZone(func_get_args());
return $this->timeZone;
}
/**
* Perform a {@see strcmp} style comparison with another time point.
*
* @param TimePointInterface $timePoint The time point to compare.
*
* @return integer 0 if $this and $timePoint are equal, <0 if $this < $timePoint, or >0 if $this > $timePoint.
*/
public function compare(TimePointInterface $timePoint)
{
$this->typeCheck->compare(func_get_args());
// Identical ...
if ($this === $timePoint) {
return 0;
// Another date/time ...
} elseif ($timePoint instanceof self) {
return $this->year() - $timePoint->year()
?: $this->month() - $timePoint->month()
?: $this->day() - $timePoint->day()
?: $this->hours() - $timePoint->hours()
?: $this->minutes() - $timePoint->minutes()
?: $this->seconds() - $timePoint->seconds()
?: $this->timeZone()->compare($timePoint->timeZone());
}
// Fallback to timestamp calculation ...
return $this->unixTime() - $timePoint->unixTime();
}
/**
* @return integer The number of seconds since unix epoch (1970-01-01 00:00:00+00:00).
*/
public function unixTime()
{
$this->typeCheck->unixTime(func_get_args());
return gmmktime(
$this->hours(),
$this->minutes(),
$this->seconds(),
$this->month(),
$this->day(),
$this->year()
) - $this->timeZone()->offset();
}
/**
* @return string A string representing this object in an ISO compatible format (YYYY-MM-DD).
*/
public function isoString()
{
$this->typeCheck->isoString(func_get_args());
return sprintf(
'%04d-%02d-%02d %02d:%02d:%02d%s',
$this->year(),
$this->month(),
$this->day(),
$this->hours(),
$this->minutes(),
$this->seconds(),
$this->timeZone()
);
}
/**
* @return string A string representing this object in an ISO compatible format (YYYY-MM-DD).
*/
public function __toString()
{
return $this->isoString();
}
private $typeCheck;
private $year;
private $month;
private $day;
private $hours;
private $minutes;
private $seconds;
private $timeZone;
}