ilTimeZone Class Reference

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

Collaboration diagram for ilTimeZone:

Public Member Functions
	getIdentifier ()
	get identifier
	switchTZ ()
	Switch timezone to given timezone.
	restoreTZ ()
	Restore default timezone.
	validateTZ ()
	validate timezone

Static Public Member Functions
static	_getInstance ($a_tz= '')
	get instance by timezone
static	_setDefaultTimeZone ($a_tz)
	set default timezone
static	_restoreDefaultTimeZone ()
	restore default timezone to server timezone
static	_getDefaultTimeZone ()
	Calculate and set default time zone.

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.

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.

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

ilTimeZone::__construct (   $a_timezone )

private

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

private

Parameters

string

valid timezone

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

References $ilLog, and _getDefaultTimeZone().

        {
                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();
                }
        }

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Member Function Documentation

static ilTimeZone::_getDefaultTimeZone ( )

static

Calculate and set default time zone.

public

Returns

time zone string

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

References $default_timezone, and UTC.

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

        {
                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;
        }

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

static

get instance by timezone

public

Parameters

string

valid php timezone

Exceptions

ilTimeZoneException

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

References $ilLog, $valid_tz, and _getDefaultTimeZone().

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

        {
                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;
        }

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static ilTimeZone::_restoreDefaultTimeZone ( )

static

restore default timezone to server timezone

public

Parameters

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

References $server_timezone, and _switchTimeZone().

Referenced by ilCalendarRecurrenceCalculator\calculateDateList().

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

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static ilTimeZone::_setDefaultTimeZone (   $a_tz )

static

set default timezone

public

Parameters

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

References _getDefaultTimeZone().

Referenced by ilCalendarRecurrenceCalculator\adjustTimeZones().

        {
                // 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;
        }

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static ilTimeZone::_switchTimeZone (   $a_timezone )

staticprotected

Switch tz.

public

Exceptions

ilTimeZoneException

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

References $ilLog.

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

        {
                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;
        }

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ilTimeZone::getIdentifier

(

)

get identifier

public

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

References $timezone.

        {
                return $this->timezone;
        }

ilTimeZone::restoreTZ

(

)

Restore default timezone.

public

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

References _switchTimeZone().

Referenced by validateTZ().

        {
                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;
                 }
        }

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ilTimeZone::switchTZ

(

)

Switch timezone to given timezone.

public

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

References _switchTimeZone().

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

        {
                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;
                }
        }

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ilTimeZone::validateTZ

(

)

validate timezone

public

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

References restoreTZ(), and switchTZ().

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

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Field Documentation

ilTimeZone::$current_timezone = ''

staticprotected

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

ilTimeZone::$default_timezone = ''

staticprotected

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

Referenced by _getDefaultTimeZone().

ilTimeZone::$instances = array()

static

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

ilTimeZone::$log

protected

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

ilTimeZone::$server_timezone = ''

staticprotected

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

Referenced by _restoreDefaultTimeZone().

ilTimeZone::$timezone = "UTC"

protected

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

Referenced by getIdentifier().

ilTimeZone::$valid_tz = array()

static

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

Referenced by _getInstance().

const ilTimeZone::UTC = 'UTC'

Definition at line 45 of file class.ilTimeZone.php.

Referenced by ilDate\__construct(), _getDefaultTimeZone(), ilCalendarRecurrenceCalculator\adjustTimeZones(), ilExportFileInfo\create(), ilContainerXmlParser\parseTiming(), ilExportFileInfo\read(), ilDateList\removeByDAY(), ilCalendarEntry\save(), ilCalendarEntry\update(), and ilContainerXmlWriter\writeCourseItemInformation().

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

• Services/Calendar/classes/class.ilTimeZone.php