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<?php
/**
* DateTime property
*
* This element is used for iCalendar properties such as the DTSTART property.
* It basically provides a few helper functions that make it easier to deal
* with these. It supports both DATE-TIME and DATE values.
*
* In order to use this correctly, you must call setDateTime and getDateTime to
* retrieve and modify dates respectively.
*
* If you use the 'value' or properties directly, this object does not keep
* reference and results might appear incorrectly.
*
* @package Sabre
* @subpackage VObject
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_VObject_Property_DateTime extends Sabre_VObject_Property {
/**
* Local 'floating' time
*/
const LOCAL = 1;
/**
* UTC-based time
*/
const UTC = 2;
/**
* Local time plus timezone
*/
const LOCALTZ = 3;
/**
* Only a date, time is ignored
*/
const DATE = 4;
/**
* DateTime representation
*
* @var DateTime
*/
protected $dateTime;
/**
* dateType
*
* @var int
*/
protected $dateType;
/**
* Updates the Date and Time.
*
* @param DateTime $dt
* @param int $dateType
* @return void
*/
public function setDateTime(DateTime $dt, $dateType = self::LOCALTZ) {
switch($dateType) {
case self::LOCAL :
$this->setValue($dt->format('Ymd\\THis'));
$this->offsetUnset('VALUE');
$this->offsetUnset('TZID');
$this->offsetSet('VALUE','DATE-TIME');
break;
case self::UTC :
$dt->setTimeZone(new DateTimeZone('UTC'));
$this->setValue($dt->format('Ymd\\THis\\Z'));
$this->offsetUnset('VALUE');
$this->offsetUnset('TZID');
$this->offsetSet('VALUE','DATE-TIME');
break;
case self::LOCALTZ :
$this->setValue($dt->format('Ymd\\THis'));
$this->offsetUnset('VALUE');
$this->offsetUnset('TZID');
$this->offsetSet('VALUE','DATE-TIME');
$this->offsetSet('TZID', $dt->getTimeZone()->getName());
break;
case self::DATE :
$this->setValue($dt->format('Ymd'));
$this->offsetUnset('VALUE');
$this->offsetUnset('TZID');
$this->offsetSet('VALUE','DATE');
break;
default :
throw new InvalidArgumentException('You must pass a valid dateType constant');
}
$this->dateTime = $dt;
$this->dateType = $dateType;
}
/**
* Returns the current DateTime value.
*
* If no value was set, this method returns null.
*
* @return DateTime|null
*/
public function getDateTime() {
if ($this->dateTime)
return $this->dateTime;
list(
$this->dateType,
$this->dateTime
) = self::parseData($this->value, $this);
return $this->dateTime;
}
/**
* Returns the type of Date format.
*
* This method returns one of the format constants. If no date was set,
* this method will return null.
*
* @return int|null
*/
public function getDateType() {
if ($this->dateType)
return $this->dateType;
list(
$this->dateType,
$this->dateTime,
) = self::parseData($this->value, $this);
return $this->dateType;
}
/**
* Parses the internal data structure to figure out what the current date
* and time is.
*
* The returned array contains two elements:
* 1. A 'DateType' constant (as defined on this class), or null.
* 2. A DateTime object (or null)
*
* @param string|null $propertyValue The string to parse (yymmdd or
* ymmddThhmmss, etc..)
* @param Sabre_VObject_Property|null $property The instance of the
* property we're parsing.
* @return array
*/
static public function parseData($propertyValue, Sabre_VObject_Property $property = null) {
if (is_null($propertyValue)) {
return array(null, null);
}
$date = '(?P<year>[1-2][0-9]{3})(?P<month>[0-1][0-9])(?P<date>[0-3][0-9])';
$time = '(?P<hour>[0-2][0-9])(?P<minute>[0-5][0-9])(?P<second>[0-5][0-9])';
$regex = "/^$date(T$time(?P<isutc>Z)?)?$/";
if (!preg_match($regex, $propertyValue, $matches)) {
throw new InvalidArgumentException($propertyValue . ' is not a valid DateTime or Date string');
}
if (!isset($matches['hour'])) {
// Date-only
return array(
self::DATE,
new DateTime($matches['year'] . '-' . $matches['month'] . '-' . $matches['date'] . ' 00:00:00'),
);
}
$dateStr =
$matches['year'] .'-' .
$matches['month'] . '-' .
$matches['date'] . ' ' .
$matches['hour'] . ':' .
$matches['minute'] . ':' .
$matches['second'];
if (isset($matches['isutc'])) {
$dt = new DateTime($dateStr,new DateTimeZone('UTC'));
$dt->setTimeZone(new DateTimeZone('UTC'));
return array(
self::UTC,
$dt
);
}
// Finding the timezone.
$tzid = $property['TZID'];
if (!$tzid) {
return array(
self::LOCAL,
new DateTime($dateStr)
);
}
try {
// tzid an Olson identifier?
$tz = new DateTimeZone($tzid->value);
} catch (Exception $e) {
// Not an Olson id, we're going to try to find the information
// through the time zone name map.
$newtzid = Sabre_VObject_WindowsTimezoneMap::lookup($tzid->value);
if (is_null($newtzid)) {
// Not a well known time zone name either, we're going to try
// to find the information through the VTIMEZONE object.
// First we find the root object
$root = $property;
while($root->parent) {
$root = $root->parent;
}
if (isset($root->VTIMEZONE)) {
foreach($root->VTIMEZONE as $vtimezone) {
if (((string)$vtimezone->TZID) == $tzid) {
if (isset($vtimezone->{'X-LIC-LOCATION'})) {
$newtzid = (string)$vtimezone->{'X-LIC-LOCATION'};
} else {
// No libical location specified. As a last resort we could
// try matching $vtimezone's DST rules against all known
// time zones returned by DateTimeZone::list*
// TODO
}
}
}
}
}
try {
$tz = new DateTimeZone($newtzid);
} catch (Exception $e) {
// If all else fails, we use the default PHP timezone
$tz = new DateTimeZone(date_default_timezone_get());
}
}
$dt = new DateTime($dateStr, $tz);
$dt->setTimeZone($tz);
return array(
self::LOCALTZ,
$dt
);
}
}
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