This class offers methods for timezone handling. More...

Collaboration diagram for ilTimeZone:

Public Member Functions
	getIdentifier ()
	get identifier More...

	switchTZ ()
	Switch timezone to given timezone. More...

	restoreTZ ()
	Restore default timezone. More...

	validateTZ ()
	validate timezone More...

Static Public Member Functions
static	_getInstance ($a_tz='')
	get instance by timezone More...

static	_setDefaultTimeZone ($a_tz)
	set default timezone More...

static	_restoreDefaultTimeZone ()
	restore default timezone to server timezone More...

static	_getDefaultTimeZone ()
	Calculate and set default time zone. More...

Data Fields
const	UTC = 'UTC'

Static Public Attributes
static	$instances = array()

static	$valid_tz = array()

Static Protected Member Functions
static	_switchTimeZone ($a_timezone)
	Switch tz More...

Protected Attributes
	$log

	$timezone = "UTC"

Static Protected Attributes
static	$default_timezone = ''

static	$current_timezone = ''

static	$server_timezone = ''

Private Member Functions
	__construct ($a_timezone)
	Create new timezone object If no timezone is given, the default server timezone is chosen. More...

Detailed Description

This class offers methods for timezone handling.

ilTimeZone::_getDefault tries to "guess" the server timezone in the following manner: 1) PHP >= 5.2.0 use date_default_timezone_get 2) Read ini option date.timezone if available 3) Read environment PHP_TZ 4) Read environment TZ 5) Use date('T') 6) Use UTC

Author: Stefan Meyer smeye.nosp@m.r.il.nosp@m.ias@g.nosp@m.mx.d.nosp@m.e

Version: $Id$

Definition at line 43 of file class.ilTimeZone.php.

Constructor & Destructor Documentation

◆ __construct()

ilTimeZone::__construct ( $a_timezone )

private

Create new timezone object If no timezone is given, the default server timezone is chosen.

@access private

Parameters

string valid timezone

Definition at line 65 of file class.ilTimeZone.php.

        {
                global $ilLog;
 
                $this->log = $ilLog;
 
                if($a_timezone)
                {
                        $this->timezone = $a_timezone;
                }
                else
                {
                        $this->timezone = self::_getDefaultTimeZone();
                }
                
                if(!self::$server_timezone)
                {
                        self::$server_timezone = self::_getDefaultTimeZone();
                }
                
                if(!self::$default_timezone)
                {
                        self::_getDefaultTimeZone();
                }
        }

References $ilLog, and _getDefaultTimeZone().

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Member Function Documentation

◆ _getDefaultTimeZone()

static ilTimeZone::_getDefaultTimeZone ( )

static

Calculate and set default time zone.

@access public

Returns: time zone string

Definition at line 277 of file class.ilTimeZone.php.

        {
                if(strlen(self::$default_timezone))
                {
                        return self::$default_timezone;
                }
                // PHP >= 5.2.0
                if(function_exists('date_default_timezone_get') and $tz = date_default_timezone_get())
                {
                        return self::$default_timezone = $tz;
                }
                // PHP ini option (PHP >= 5.1.0)
                if($tz = ini_get('date.timezone'))
                {
                        return self::$default_timezone = $tz;
                }
                // is $_ENV['PHP_TZ'] set ?
                if($tz = getenv('PHP_TZ'))
                {
                        return self::$default_timezone = $tz;
                }
                // is $_ENV['TZ'] set ?
                if($tz = getenv('TZ'))
                {
                        return self::$default_timezone = $tz;
                }
                if(strlen($tz = date('T')))
                {
                        return self::$default_timezone = $tz;
                }
                return self::$default_timezone = self::UTC;
        }

References $default_timezone, and UTC.

Referenced by ilSoapInstallationInfoXMLWriter\__buildClient(), __construct(), _getInstance(), _setDefaultTimeZone(), ilObjCalendarSettingsGUI\initFormSettings(), and ilCalendarSettings\read().

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◆ _getInstance()

static ilTimeZone::_getInstance ( $a_tz = '' )

static

get instance by timezone

@access public

Parameters

string valid php timezone

Exceptions

ilTimeZoneException

Definition at line 111 of file class.ilTimeZone.php.

        {
                global $ilLog;
                
                if(!$a_tz)
                {
                        $a_tz = self::_getDefaultTimeZone();
                }
                
                if(isset(self::$instances[$a_tz]))
                {
                        $instance = self::$instances[$a_tz];
                }
                else
                {
                        $instance = self::$instances[$a_tz] = new ilTimeZone($a_tz);
                }
 
                // Validate timezone if it is not validated before
                if(!array_key_exists($instance->getIdentifier(),self::$valid_tz))
                {
                        if(!$instance->validateTZ())
                        {
                                throw new ilTimeZoneException('Unsupported timezone given.');
                        }
                        self::$valid_tz[$instance->getIdentifier()] = true;
                }
 
                // now validate timezone setting
                return $instance;
        }

References $ilLog, and _getDefaultTimeZone().

Referenced by ilDate\__construct(), ilDateTime\__construct(), ilCalendarRecurrenceCalculator\applyBYMONTHDAYRules(), ilDateTime\get(), ilICalParser\getTZ(), ilICalParser\parse(), ilDateTime\setDate(), ilDateTime\switchTimeZone(), and ilUserImportParser\verifyPref().

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◆ _restoreDefaultTimeZone()

static ilTimeZone::_restoreDefaultTimeZone ( )

static

restore default timezone to server timezone

@access public

Parameters

Definition at line 264 of file class.ilTimeZone.php.

        {
                self::$default_timezone = self::$server_timezone;
                self::_switchTimeZone(self::$default_timezone);
        }

References $server_timezone, and _switchTimeZone().

Referenced by ilCalendarRecurrenceCalculator\calculateDateList().

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◆ _setDefaultTimeZone()

static ilTimeZone::_setDefaultTimeZone ( $a_tz )

static

set default timezone

@access public

Parameters

Definition at line 245 of file class.ilTimeZone.php.

        {
                // Save the server timezone, since there is no way to read later.
                if(!self::$server_timezone)
                {
                        self::$server_timezone = self::_getDefaultTimeZone();
                }
                
                self::$default_timezone = $a_tz;
        }

References _getDefaultTimeZone().

Referenced by ilCalendarRecurrenceCalculator\adjustTimeZones().

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◆ _switchTimeZone()

static ilTimeZone::_switchTimeZone ( $a_timezone )

staticprotected

Switch tz

@access public

Exceptions

ilTimeZoneException

Definition at line 206 of file class.ilTimeZone.php.

        {
                global $ilLog;
                
                if(self::$current_timezone == $a_timezone)
                {
                        #$ilLog->write(__METHOD__.': Do not switch to active timezone: '.$a_timezone);
                        return true;
                }
                
                // PHP >= 5.2.0
                if(function_exists('date_default_timezone_set'))
                {
                        if(!date_default_timezone_set($a_timezone))
                        {
                                $ilLog->write(__METHOD__.': Invalid timezone given. Timezone: '.$a_timezone);
                                throw new ilTimeZoneException('Invalid timezone given'); 
                        }
                        #$ilLog->write(__METHOD__.': Switched timezone to: '.$a_timezone);
                        self::$current_timezone = $a_timezone;
                        return true;
                }
                if(!putenv('TZ='.$a_timezone))
                {
                        $ilLog->write(__METHOD__.': Cannot set TZ environment variable. Please register TZ in php.ini (safe_mode_allowed_env_vars). Timezone');
                        throw new ilTimeZoneException('Cannot set TZ environment variable.'); 
                }
                self::$current_timezone = $a_timezone;
                return true;
        }

References $ilLog.

Referenced by _restoreDefaultTimeZone(), restoreTZ(), and switchTZ().

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◆ getIdentifier()

ilTimeZone::getIdentifier ( )

get identifier

@access public

Definition at line 97 of file class.ilTimeZone.php.

        {
                return $this->timezone;
        }

References $timezone.

◆ restoreTZ()

ilTimeZone::restoreTZ ( )

Restore default timezone.

@access public

Definition at line 168 of file class.ilTimeZone.php.

        {
                try
                {
                        self::_switchTimeZone(self::$default_timezone);
                        return true;
                }
                catch(ilTimeZoneException $e)
                 {
                        // Shouldn't happen since this has been checked during initialisation
                        $this->log->write(__METHOD__.': Unsupported timezone given: Timzone: '.$this->timezone);
                        return false;
                 }
        }

References _switchTimeZone().

Referenced by validateTZ().

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◆ switchTZ()

ilTimeZone::switchTZ ( )

Switch timezone to given timezone.

@access public

Definition at line 148 of file class.ilTimeZone.php.

        {
                try
                {
                        self::_switchTimeZone($this->timezone);
                        return true;
                }
                catch(ilTimeZoneException $exc)
                {
                        // Shouldn't happen since this has been checked during initialisation
                        $this->log->write(__METHOD__.': Unsupported timezone given: Timzone: '.$this->timezone);
                        return false;
                }
        }

References _switchTimeZone().

Referenced by ilICalParser\switchTZ(), and validateTZ().

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◆ validateTZ()

ilTimeZone::validateTZ ( )

validate timezone

@access public

Definition at line 189 of file class.ilTimeZone.php.

        {
                // this is done by switching to the current tz
                if($this->switchTZ() and $this->restoreTZ())
                {
                        return true;
                }
                return false;
        }

References restoreTZ(), and switchTZ().

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Field Documentation

◆ $current_timezone

ilTimeZone::$current_timezone = ''

staticprotected

Definition at line 51 of file class.ilTimeZone.php.

◆ $default_timezone

ilTimeZone::$default_timezone = ''

staticprotected

Definition at line 50 of file class.ilTimeZone.php.

Referenced by _getDefaultTimeZone().

◆ $instances

ilTimeZone::$instances = array()

static

Definition at line 47 of file class.ilTimeZone.php.

◆ $log

ilTimeZone::$log

protected

Definition at line 54 of file class.ilTimeZone.php.

◆ $server_timezone

ilTimeZone::$server_timezone = ''

staticprotected

Definition at line 52 of file class.ilTimeZone.php.

Referenced by _restoreDefaultTimeZone().

◆ $timezone

ilTimeZone::$timezone = "UTC"

protected

Definition at line 55 of file class.ilTimeZone.php.

Referenced by getIdentifier().

◆ $valid_tz

ilTimeZone::$valid_tz = array()

static

Definition at line 48 of file class.ilTimeZone.php.

◆ UTC

const ilTimeZone::UTC = 'UTC'

The documentation for this class was generated from the following file:

Services/Calendar/classes/class.ilTimeZone.php

Public Member Functions

Static Public Member Functions

Data Fields

Static Public Attributes

Static Protected Member Functions

Protected Attributes

Static Protected Attributes

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ _getDefaultTimeZone()

◆ _getInstance()

◆ _restoreDefaultTimeZone()

◆ _setDefaultTimeZone()

◆ _switchTimeZone()

◆ getIdentifier()

◆ restoreTZ()

◆ switchTZ()

◆ validateTZ()

Field Documentation

◆ $current_timezone

◆ $default_timezone

◆ $instances

◆ $log

◆ $server_timezone

◆ $timezone

◆ $valid_tz

◆ UTC