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egroupware_official/api/src/DateTime.php

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<?php
/**
* EGroupware time and timezone handling
*
* @package api
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @copyright 2009-16 by RalfBecker@outdoor-training.de
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @version $Id$
*/
namespace EGroupware\Api;
// we do not have an own implementation/extensions
use DateTimeZone;
use DateInterval;
/**
* EGroupware time and timezone handling class extending PHP's DateTime
*
* Api\DateTime class knows 2 timezones:
* 1. Api\DateTime::$user_timezone timezone of the user, defined in his prefs $GLOBALS['egw_info']['user']['preferences']['common']['tz']
* 2. Api\DateTime::$server_timezone timezone of the server, read via date_default_timezone_get()
*
* The class extends PHP5.2's DateTime object to:
* - format date and time according to format in user prefs ($type===true: date, $type===false: time, $type==='' date+time)
* - defaulting to a user timezone according to user prefs (not server timezone as DateTime!)
* - deal with integer unix timestamps and DB timestamps in server-time ($type: 'ts'='integer' or 'server' timestamp in servertime)
*
* There are two static methods for simple conversation between server and user time:
* - Api\DateTime::server2user($time,$type=null)
* - Api\DateTime::user2server($time,$type=null)
* (Replacing in 1.6 and previous used adding of tz_offset, which is only correct for current time)
*
* An other static method allows to format any time in several ways: Api\DateTime::to($time,$type) (exceed date($type,$time)).
*
* The constructor of Api\DateTime understand - in addition to DateTime - integer timestamps, array with values for
* keys: ('year', 'month', 'day') or 'full' plus 'hour', 'minute' and optional 'second' or a DateTime object as parameter.
* It defaults to user-time, not server time as DateTime!
*
* The constructor itself throws an \Exception in that case (to be precise it does not handle the one thrown by DateTime constructor).
* Static methods server2user, user2server and to return NULL, if given time could not be parsed.
*
* Please note: EGroupware historically uses timestamps, which are NOT in UTC!
* -----------
* So in general the following thre are NOT the same value:
* a) (new Api\DateTime($time))->getTimestamp() - regular timestamp in UTC like time()
* b) (new Api\DateTime($time))->format('ts') - EGroupware timestamp in user-timezone, UI and BO objects
* c) Api\DateTime($time)::user2server('ts') - EGroupware timestamp in server-timezone, SO / integer in database
*
* @link http://www.php.net/manual/en/class.datetime.php
* @link http://www.php.net/manual/en/class.datetimezone.php
*/
class DateTime extends \DateTime
{
/**
* Database timestamp format: Y-m-d H:i:s
*/
const DATABASE = 'Y-m-d H:i:s';
/**
* etemplate2 format for ignoring timezones in the browser
*/
const ET2 = 'Y-m-d\TH:i:s\Z';
/**
* DateTimeZone of server, read from $GLOBALS['egw_info']['server']['server_timezone'], set by self::init()
*
* @var DateTimeZone
*/
static public $server_timezone;
/**
* DateTimeZone of user, read from user prefs, set by self::init() or self::setUserPrefs()
*
* @var DateTimeZone
*/
static public $user_timezone;
/**
* Time format from user prefs, set by self::setUserPrefs()
*
* @var string
*/
static public $user_timeformat = 'H:i';
/**
* Date format from user prefs, set by self::setUserPrefs()
*
* @var string
*/
static public $user_dateformat = 'Y-m-d';
/**
* Constructor
*
* @param int|string|array|DateTime $time ='now' integer timestamp, string with date+time, DateTime object or
* array with values for keys('year','month','day') or 'full' plus 'hour','minute' and optional 'second'
* @param DateTimeZone $tz =null timezone, default user time (PHP DateTime default to server time!)
* @param string &$type=null on return type of $time (optional)
* @throws Exception if $time can NOT be parsed
*/
public function __construct($time='now',DateTimeZone $tz=null,&$type=null)
{
if (is_null($tz)) $tz = self::$user_timezone; // default user timezone
switch(($type = gettype($time)))
{
case 'NULL':
case 'boolean': // depricated use in calendar for 'now'
$time = 'now';
$type = 'string';
// fall through
case 'string':
if (!(is_numeric($time) && ($time > 21000000 || $time < 19000000)))
{
$t_str = $time;
if (is_numeric($time) && strlen($time) == 8) $t_str .= 'T000000'; // 'Ymd' string used in calendar to represent a date
// $time ending in a Z (Zulu or UTC time), is unterstood by DateTime class itself
try {
parent::__construct($t_str,$tz);
break;
}
catch(Exception $e) {
// if string is nummeric, ignore the exception and treat string as timestamp
if (!is_numeric($time)) throw $e;
}
}
$type = 'integer';
// fall through for timestamps
case 'double': // 64bit integer (timestamps > 2038) are treated on 32bit systems as double
case 'integer':
/* ToDo: Check if PHP5.3 setTimestamp does the same, or always expects UTC timestamp
if (PHP_VERSION >= 5.3)
{
parent::__construct('now',$tz);
$datetime->setTimestamp($time);
}
else*/
{
parent::__construct(date('Y-m-d H:i:s',$time),$tz);
}
break;
case 'array':
// JSON serialized DateTime object
if (isset($time['timezone_type']) && !empty($time['date']) && !empty($time['timezone']))
{
parent::__construct($time['date'], new DateTimeZone($time['timezone']));
break;
}
parent::__construct('now',$tz);
if (isset($time['Y'])) // array format used in eTemplate
{
$time = array(
'year' => $time['Y'],
'month' => $time['m'],
'day' => $time['d'],
'hour' => $time['H'],
'minute' => $time['i'],
'second' => $time['s'],
);
}
if (!empty($time['full']) && empty($time['year']))
{
$time['year'] = (int)substr($time['full'],0,4);
$time['month'] = (int)substr($time['full'],4,2);
$time['day'] = (int)substr($time['full'],6,2);
}
if (isset($time['year'])) $this->setDate((int)$time['year'],(int)$time['month'],isset($time['day']) ? (int)$time['day'] : (int)$time['mday']);
$this->setTime((int)$time['hour'],(int)$time['minute'],(int)$time['second']);
break;
case 'object':
if ($time instanceof \DateTime)
{
parent::__construct($time->format('Y-m-d H:i:s'),$time->getTimezone());
$this->setTimezone($tz);
break;
}
// fall through
default:
throw new Exception\AssertionFailed("Not implemented for type ($type)$time!");
}
}
/**
* Like DateTime::add, but additional allow to use a string run through DateInterval::createFromDateString
*
* @param DateInterval|string $interval eg. '1 day', '-2 weeks'
*/
public function add($interval)
{
if (is_string($interval)) $interval = DateInterval::createFromDateString($interval);
parent::add($interval);
}
/**
* Set date to beginning of the week taking into account calendar weekdaystarts preference
*/
public function setWeekstart()
{
$wday = (int) $this->format('w'); // 0=sun, ..., 6=sat
switch($GLOBALS['egw_info']['user']['preferences']['calendar']['weekdaystarts'])
{
case 'Sunday':
$wstart = -$wday;
break;
case 'Saturday':
$wstart = -(6-$wday);
break;
case 'Monday':
default:
$wstart = -($wday ? $wday-1 : 6);
break;
}
if ($wstart) $this->add($wstart.'days');
}
/**
* return SQL implementing filtering by date
*
* @param string $name
* @param int &$start
* @param int &$end
* @param string $column name of timestamp column to use in returned sql
* @param array $filters $name => list($syear,$smonth,$sday,$sweek,$eyear,$emonth,$eday,$eweek) pairs with offsets
* @return string
*/
public static function sql_filter($name, &$start, &$end, $column, array $filters=array())
{
if ($name == 'custom' && $start)
{
$start = new DateTime($start);
$start->setTime(0, 0, 0);
if ($end)
{
$end = new DateTime($end);
$end->setTime(0, 0, 0);
$end->add('+1day');
}
}
else
{
if (!isset($filters[$name]))
{
return '1=1';
}
$start = new DateTime('now');
$start->setTime(0, 0, 0);
$end = new DateTime('now');
$end->setTime(0, 0, 0);
$year = (int) $start->format('Y');
$month = (int) $start->format('m');
list($syear,$smonth,$sday,$sweek,$eyear,$emonth,$eday,$eweek) = $filters[$name];
// Handle quarters
if(stripos($name, 'quarter') !== false)
{
$start->setDate($year, ((int)floor(($smonth+$month) / 3.1)) * 3 + 1, 1);
$end->setDate($year, ((int)floor(($emonth+$month) / 3.1)+1) * 3 + 1, 1);
}
elseif ($syear || $eyear)
{
$start->setDate($year+$syear, 1, 1);
$end->setDate($year+$eyear, 1, 1);
}
elseif ($smonth || $emonth)
{
$start->setDate($year, $month+$smonth, 1);
$end->setDate($year, $month+$emonth, 1);
}
elseif ($sday || $eday)
{
if ($sday) $start->add($sday.'days');
if ($eday) $end->add($eday.'days');
}
elseif ($sweek || $eweek)
{
$start->setWeekstart();
if ($sweek) $start->add($sweek.'weeks');
$end->setWeekstart();
if ($eweek) $end->add($eweek.'weeks');
}
}
// convert start + end from user to servertime for the filter
$sql = '('.DateTime::user2server($start, 'ts').' <= '.$column;
if($end)
{
$sql .=' AND '.$column.' < '.DateTime::user2server($end, 'ts');
// returned timestamps: $end is an inclusive date, eg. for today it's equal to start!
$end->add('-1day');
$end = $end->format('ts');
}
$sql .= ')';
//error_log(__METHOD__."('$name', ...) syear=$syear, smonth=$smonth, sday=$sday, sweek=$sweek, eyear=$eyear, emonth=$emonth, eday=$eday, eweek=$eweek --> start=".$start->format().', end='.$end->format().", sql='$sql'");
$start = $start->format('ts');
return $sql;
}
/**
* Set user timezone, according to user prefs: converts current time to user time
*
* Does nothing if self::$user_timezone is current timezone!
*
* @return self to allow chaining
*/
public function setUser()
{
$this->setTimezone(self::$user_timezone);
return $this;
}
/**
* Set server timezone: converts current time to server time
*
* Does nothing if self::$server_timezone is current timezone!
*
* @return self to allow chaining
*/
public function setServer()
{
$this->setTimezone(self::$server_timezone);
return $this;
}
/**
* Format DateTime object as a specific type or string
*
* EGroupware's integer timestamp is NOT the usual UTC timestamp, but has a timezone offset applied!
* Use $type === 'utc' or getTimestamp() method to get a regular timestamp in UTC.
*
* @param string $type ='' 'integer'|'ts'=timestamp, 'server'=timestamp in servertime, 'string'='Y-m-d H:i:s', 'object'=DateTime,
* 'array'=array with values for keys ('year','month','day','hour','minute','second','full','raw') or string with format
* true = date only, false = time only as in user prefs, '' = date+time as in user prefs, 'utc'=regular timestamp in UTC
* @return int|string|array|datetime see $type
*/
public function format($type='')
{
switch((string)$type)
{
case '': // empty string: date and time as in user prefs
//case '': // boolean false: time as in user prefs
case '1': // boolean true: date as in user prefs
if (is_bool($type))
{
$type = $type ? self::$user_dateformat : self::$user_timeformat;
}
else
{
$type = self::$user_dateformat.', '.self::$user_timeformat;
}
break;
case 'string':
$type = self::DATABASE;
break;
case 'server': // timestamp in servertime
$this->setServer();
// fall through
case 'integer':
case 'ts':
// EGroupware's integer timestamp is NOT the usual UTC timestamp, but has a timezone offset applied!
return mktime(parent::format('H'),parent::format('i'),parent::format('s'),parent::format('m'),parent::format('d'),parent::format('Y'));
case 'utc': // alias for "U" / timestamp in UTC
return $this->getTimestamp();
case 'object':
case 'datetime':
case 'egw_time':
case 'DateTime':
return clone($this);
case 'array':
$arr = array(
'year' => (int)parent::format('Y'),
'month' => (int)parent::format('m'),
'day' => (int)parent::format('d'),
'hour' => (int)parent::format('H'),
'minute' => (int)parent::format('i'),
'second' => (int)parent::format('s'),
'full' => parent::format('Ymd'),
);
$arr['raw'] = mktime($arr['hour'],$arr['minute'],$arr['second'],$arr['month'],$arr['day'],$arr['year']);
return $arr;
case 'date_array': // array with short keys used by date: Y, m, d, H, i, s (used in eTemplate)
return array(
'Y' => (int)parent::format('Y'),
'm' => (int)parent::format('m'),
'd' => (int)parent::format('d'),
'H' => (int)parent::format('H'),
'i' => (int)parent::format('i'),
's' => (int)parent::format('s'),
);
}
// default $type contains string with format
return parent::format($type);
}
/**
* Convert a server time into a user time
*
* @param int|string|array|DateTime $time
* @param string $type =null type or return-value, default (null) same as $time
* @return int|string|array|datetime null if time could not be parsed
*/
public static function server2user($time,$type=null)
{
$typeof='DateTime';
if (!($time instanceof DateTime))
{
try
{
$time = new DateTime($time, self::$server_timezone, $typeof);
}
catch(Exception $e)
{
unset($e);
return null; // time could not be parsed
}
}
$time->setUser();
if (is_null($type)) $type = $typeof;
//echo "<p>".__METHOD__."($time,$type) = ".print_r($format->format($type),true)."</p>\n";
return $time->format($type);
}
/**
* Convert a user time into a server time
*
* @param int|string|array|datetime $time
* @param string $type =null type or return-value, default (null) same as $time
* @return int|string|array|datetime null if time could not be parsed
*/
public static function user2server($time,$type=null)
{
$typeof='DateTime';
if (!($time instanceof DateTime))
{
try
{
$time = new DateTime($time,self::$user_timezone,$typeof);
}
catch(Exception $e)
{
unset($e);
return null; // time could not be parsed
}
}
$time->setServer();
if (is_null($type)) $type = $typeof;
//echo "<p>".__METHOD__."($time,$type) = ".print_r($format->format($type),true)."</p>\n";
return $time->format($type);
}
/**
* Convert time to a specific format or string, static version of DateTime::format()
*
* @param int|string|array|DateTime $time ='now' see constructor
* @param string $type ='' 'integer'|'ts'=timestamp, 'server'=timestamp in servertime, 'string'='Y-m-d H:i:s', 'object'=DateTime,
* 'array'=array with values for keys ('year','month','day','hour','minute','second','full','raw') or string with format
* true = date only, false = time only as in user prefs, '' = date+time as in user prefs
* @return int|string|array|datetime see $type, null if time could not be parsed
*/
public static function to($time='now',$type='')
{
if (!($time instanceof DateTime))
{
try
{
// Try user format first
$time = static::createFromUserFormat($time);
}
catch(\Exception $e)
{
unset($e);
return null; // time could not be parsed
}
}
return $time->format($type);
}
/**
* Some user formats are conflicting and cannot be reliably parsed by the
* normal means. Here we agressively try various date formats (based on
* user's date preference) to coerce a troublesome date into a DateTime.
*
* ex: 07/08/2018 could be DD/MM/YYYY or MM/DD/YYYY
*
* Rather than trust DateTime to guess right based on its settings, we use
* the user's date preference to resolve the ambiguity.
*
* @param string $time
* @return DateTime or null
*/
public static function createFromUserFormat($time)
{
$date = null;
// If numeric, just let normal constructor do it
if(is_numeric($time) || is_array($time))
{
return new DateTime($time);
}
// Various date formats in decreasing preference
$formats = array(
'!'.static::$user_dateformat . ' ' .static::$user_timeformat.':s',
'!'.static::$user_dateformat . '*' .static::$user_timeformat.':s',
'!'.static::$user_dateformat . '* ' .static::$user_timeformat,
'!'.static::$user_dateformat . '*',
'!'.static::$user_dateformat,
'!Y-m-d\TH:i:s'
);
// Try the different formats, stop when one works
foreach($formats as $f)
{
try {
$date = static::createFromFormat(
$f,
$time,
static::$user_timezone
);
if($date) break;
} catch (\Exception $e) {
}
}
// Need correct class, createFromFormat() gives parent
return new DateTime($date ? $date : $time);
}
/**
* Setter for user timezone, should be called after reading user preferences
*
* @param string $tz timezone, eg. 'Europe/Berlin' or 'UTC'
* @param string $dateformat ='' eg. 'Y-m-d' or 'd.m.Y'
* @param string|int $timeformat ='' integer 12, 24, or format string eg. 'H:i'
* @return DateTimeZone
*/
public static function setUserPrefs($tz,$dateformat='',$timeformat='')
{
//echo "<p>".__METHOD__."('$tz','$dateformat','$timeformat') ".function_backtrace()."</p>\n";
if (!empty($dateformat)) self::$user_dateformat = $dateformat;
switch($timeformat)
{
case '':
break;
case '24':
self::$user_timeformat = 'H:i';
break;
case '12':
self::$user_timeformat = 'h:i a';
break;
default:
self::$user_timeformat = $timeformat;
break;
}
try {
self::$user_timezone = new DateTimeZone($tz);
}
catch(\Exception $e)
{
unset($e);
// silently use server timezone, as we have no means to report the wrong timezone to the user from this class
self::$user_timezone = clone(self::$server_timezone);
}
return self::$user_timezone;
}
/**
* Get offset in seconds between user and server time at given time $time
*
* Compatibility method for old code. It is only valid for the given time, because of possible daylight saving changes!
*
* @param int|string|DateTime $time ='now'
* @return int difference in seconds between user and server time (for the given time!)
*/
public static function tz_offset_s($time='now')
{
if (!($time instanceof DateTime)) $time = new DateTime($time);
return self::$user_timezone->getOffset($time) - self::$server_timezone->getOffset($time);
}
/**
* Init static variables, reading user prefs
*/
public static function init()
{
// if no server timezone set, use date_default_timezone_get() to determine it
if (empty($GLOBALS['egw_info']['server']['server_timezone']))
{
$GLOBALS['egw_info']['server']['server_timezone'] = date_default_timezone_get();
}
// make sure we have a valid server timezone set
try {
self::$server_timezone = new DateTimeZone($GLOBALS['egw_info']['server']['server_timezone']);
}
catch(\Exception $e)
{
try {
self::$server_timezone = new DateTimeZone(date_default_timezone_get());
}
catch(\Exception $e)
{
self::$server_timezone = new DateTimeZone('Europe/Berlin');
}
error_log(__METHOD__."() invalid server_timezone='{$GLOBALS['egw_info']['server']['server_timezone']}' setting now '".self::$server_timezone->getName()."'!");
Config::save_value('server_timezone',$GLOBALS['egw_info']['server']['server_timezone'] = self::$server_timezone->getName(),'phpgwapi');
}
if (!isset($GLOBALS['egw_info']['user']['preferences']['common']['tz']))
{
$GLOBALS['egw_info']['user']['preferences']['common']['tz'] = $GLOBALS['egw_info']['server']['server_timezone'];
}
self::setUserPrefs($GLOBALS['egw_info']['user']['preferences']['common']['tz'],
$GLOBALS['egw_info']['user']['preferences']['common']['dateformat'],
$GLOBALS['egw_info']['user']['preferences']['common']['timeformat']);
}
/**
* Return "beautified" timezone list:
* - no depricated timezones
* - return UTC and oceans at the end
* - if (user lang is a european language), move Europe to top
*
* @return array continent|ocean => array(tz-name => tz-label incl. current time)
*/
public static function getTimezones()
{
// prepare list of timezones from php, ignoring depricated ones and sort as follows
$tzs = array(
'Africa' => array(), // Contients
'America' => array(),
'Asia' => array(),
'Australia' => array(),
'Europe' => array(),
'Atlantic' => array(), // Oceans
'Pacific' => array(),
'Indian' => array(),
'Antarctica' => array(), // Poles
'Arctic' => array(),
'UTC' => array('UTC' => 'UTC'),
);
// no VTIMEZONE available in calendar_timezones --> do NOT return them
static $no_vtimezone = array(
'Europe/Tiraspol',
'America/Atka',
'America/Buenos_Aires',
'America/Catamarca',
'America/Coral_Harbour',
'America/Cordoba',
'America/Ensenada',
'America/Fort_Wayne',
'America/Indianapolis',
'America/Jujuy',
'America/Knox_IN',
'America/Mendoza',
'America/Porto_Acre',
'America/Rosario',
'America/Virgin',
'Asia/Ashkhabad',
'Asia/Beijing',
'Asia/Chungking',
'Asia/Dacca',
'Asia/Macao',
'Asia/Riyadh87',
'Asia/Riyadh88',
'Asia/Riyadh89',
'Asia/Tel_Aviv',
'Asia/Thimbu',
'Asia/Ujung_Pandang',
'Asia/Ulan_Bator',
'Australia/ACT',
'Australia/Canberra',
'Australia/LHI',
'Australia/North',
'Australia/NSW',
'Australia/Queensland',
'Australia/South',
'Australia/Tasmania',
'Australia/Victoria',
'Australia/West',
'Australia/Yancowinna',
'Pacific/Samoa',
);
foreach(DateTimeZone::listIdentifiers() as $name)
{
if (in_array($name,$no_vtimezone)) continue; // do NOT allow to set in EGroupware, as we have not VTIMEZONE component for it
list($continent) = explode('/',$name,2);
if (!isset($tzs[$continent])) continue; // old depricated timezones
$datetime = new DateTime('now',new DateTimeZone($name));
$tzs[$continent][$name] = str_replace(array('_','/'),array(' ',' / '),$name)." ".$datetime->format();
unset($datetime);
}
foreach($tzs as $continent => &$data)
{
natcasesort($data); // sort cities
}
unset($data);
// if user lang or installed langs contain a european language --> move Europe to top of tz list
$langs = class_exists('EGroupware\\Api\\Translation') ? Translation::get_installed_langs() : array();
if (array_intersect(array($GLOBALS['egw_info']['user']['preferences']['common']['lang'])+array_keys($langs),
array('de','fr','it','nl','bg','ca','cs','da','el','es-es','et','eu','fi','hr','hu','lt','no','pl','pt','sk','sl','sv','tr','uk')))
{
$tzs = array_merge(array('Europe' => $tzs['Europe']),$tzs);
}
return $tzs;
}
/**
* Get user timezones (the ones user selected in his prefs), plus evtl. an extra one
*
* @param string $extra extra timezone to add, if not already included in user timezones
* @return array tzid => label
*/
public static function getUserTimezones($extra=null)
{
$tz = $GLOBALS['egw_info']['user']['preferences']['common']['tz'];
$user_tzs = $GLOBALS['egw_info']['user']['preferences']['common']['tz_selection'];
if (!is_array($user_tzs))
{
$user_tzs = $user_tzs ? explode(',', $user_tzs) : array();
}
if ($tz && !in_array($tz, $user_tzs))
{
$user_tzs = array_merge(array($tz),$user_tzs);
}
if (!$user_tzs) // if we have no user timezones, eg. user set no pref --> use server default
{
$user_tzs = array($GLOBALS['egw_info']['server']['server_timezone']);
}
if ($extra && !in_array($extra,$user_tzs))
{
$user_tzs = array_merge(array($extra),$user_tzs);
}
$ret_user_tzs = array_combine($user_tzs,$user_tzs);
foreach($ret_user_tzs as &$label)
{
$label = str_replace(array('_','/'),array(' ',' / '),$label);
}
return $ret_user_tzs;
}
}
DateTime::init();
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