xtd::time_zone_info Class Reference

Inheritance diagram for xtd::time_zone_info:

Definition

Represents any time zone in the world.

class core_export_ time_zone_info : public xtd::icomparable<time_zone_info>, public xtd::iequatable<time_zone_info>, public xtd::object

Inheritance

xtd::object → xtd::time_zone_info

Implements

xtd::icomparable <>, xtd::iequatable <>

Namespace

xtd

Library

xtd.core

Remarks

A time zone is a geographical region in which the same time is used.

The time_zone_info class offers significant enhancements over the TimeZone class, which provides only limited functionality.

The TimeZone class recognizes only the local time zone, and can convert times between Coordinated Universal Time (UTC) and local time. A time_zone_info object can represent any time zone, and methods of the time_zone_info class can be used to convert the time in one time zone to the corresponding time in any other time zone. The members of the time_zone_info class support the following operations:

• Retrieving a time zone that is already defined by the operating system.
• Enumerating the time zones that are available on a system.
• Converting times between different time zones.
• Creating a new time zone that is not already defined by the operating system.
• Serializing a time zone for later retrieval.

Note

An instance of the time_zone_info class is immutable. Once an object has been instantiated, its values cannot be modified.

Classes
class	adjustement_rule
	Provides information about a time zone adjustment, such as the transition to and from daylight saving time. More...
class	transition_time
	Provides information about a specific time change, such as the change from daylight saving time to standard time or vice versa, in a particular time zone. More...

Public Properties
ticks	base_utc_offset () const noexcept
	Gets the time difference between the current time zone's standard time and Coordinated Universal Time (UTC).
const string &	daylight_name () const noexcept
	Gets the display name for the current time zone's daylight saving time.
const string &	display_name () const noexcept
	Gets the general display name that represents the time zone.
const string &	id () const noexcept
	Gets the time zone identifier.
const string &	standard_name () const noexcept
	Gets the display name for the time zone's standard time.
bool	supports_daylight_saving_time () const noexcept
	Gets a value indicating whether the time zone has any daylight saving time rules.*.

Public Methods
int32	compare_to (const time_zone_info &tzi) const noexcept override
	Compares the current instance with another object of the same type.
bool	equals (const time_zone_info &tzi) const noexcept override
	Indicates whether the current object is equal to another object of the same type.
std::vector< adjustement_rule >	get_adjustement_rules () const noexcept
	Retrieves an array of xtd::time_zone_info::adjustment_rule objects that apply to the current xtd::time_zone_info object.
bool	is_daylight_saving_time (const xtd::date_time &date_time) const noexcept
	Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current xtd::time_zone_info object.
xtd::string	to_string () const noexcept override
	Returns a xtd::string that represents the current object.
virtual bool	equals (const object &obj) const noexcept
	Determines whether the specified object is equal to the current object.
template<typename object_a_t , typename object_b_t >
static bool	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are considered equal.

Public Static Properties
static const time_zone_info &	local () noexcept
	Gets a time_zone_info object that represents the local time zone.
static const time_zone_info &	utc () noexcept
	Gets a time_zone_info object that represents the Coordinated Universal Time (UTC) zone.

Public Static Methods
static xtd::date_time	convert_time_to_utc (const xtd::date_time &date_time)
	Converts the specified date and time to Coordinated Universal Time (UTC).
static const std::list< time_zone_info > &	get_system_time_zones () noexcept
	Returns a sorted collection of all the time zones about which information is available on the local system.
static xtd::date_time	convert_time (const xtd::date_time &date_time, const xtd::time_zone_info &destination_time_zone)
	Converts a time to the time in a particular time zone.
static xtd::date_time	convert_time (const xtd::date_time &date_time, const xtd::time_zone_info &source_time_zone, const xtd::time_zone_info &destination_time_zone)
	Converts a time from one time zone to another.
static xtd::date_time	convert_time_by_system_time_zone_id (const xtd::date_time &date_time, const xtd::string &destination_time_zone_id)
	Converts a time to the time in another time zone based on the time zone's identifier.
static xtd::date_time	convert_time_by_system_time_zone_id (const xtd::date_time &date_time, const xtd::string &source_time_zone_id, const xtd::string &destination_time_zone_id)
	Converts a time from one time zone to another based on time zone identifiers.
static xtd::date_time	convert_from_utc (const xtd::date_time &date_time, const xtd::time_zone_info &destination_time_zone)
	Converts a Coordinated Universal Time (UTC) to the time in a specified time zone.
static xtd::date_time	convert_to_utc (const xtd::date_time &date_time, const xtd::time_zone_info &source_time_zone)
	Converts the time in a specified time zone to Coordinated Universal Time (UTC).
static xtd::date_time	convert_to_utc (const xtd::date_time &date_time)
	Converts the specified date and time to Coordinated Universal Time (UTC).
static time_zone_info	time_find_system_time_zone_by_id (const string &id)
	Retrieves a time_zone_info object from the registry based on its identifier.

Additional Inherited Members
Public Member Functions inherited from xtd::icomparable< time_zone_info >
Public Member Functions inherited from xtd::iequatable< time_zone_info >
Public Member Functions inherited from xtd::object
	object ()=default
	Create a new instance of the ultimate base class object.
virtual size_t	get_hash_code () const noexcept
	Serves as a hash function for a particular type.
virtual type_object	get_type () const noexcept
	Gets the type of the current instance.
template<typename object_t >
xtd::uptr< object_t >	memberwise_clone () const
	Creates a shallow copy of the current object.
Static Public Member Functions inherited from xtd::object
template<typename object_a_t , typename object_b_t >
static bool	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are considered equal.
template<typename object_a_t , typename object_b_t >
static bool	reference_equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are the same instance.

Member Function Documentation

base_utc_offset()

ticks xtd::time_zone_info::base_utc_offset ( ) const

noexcept

Gets the time difference between the current time zone's standard time and Coordinated Universal Time (UTC).

Returns

TimeSpan An object that indicates the time difference between the current time zone's standard time and Coordinated Universal Time (UTC).

Remarks

The time span returned by the BaseUtcOffset property can range from 14 hours (for a time zone that is 14 hours ahead of Coordinated Universal Time (UTC)) to -14 hours (for a time zone that is 14 hours behind UTC). Time zones that are ahead of UTC have a positive offset; time zones that are behind UTC have a negative offset.

The BaseUtcOffset value is represented as a whole number of minutes. It cannot include a fractional number of minutes.

Note

Because BaseUtcOffset is a property of the time_zone_info object rather than the time_zone_info.AdjustmentRule object, the time_zone_info class applies a single offset from UTC to all of a time zone's adjustments. To reflect a time zone that has modified its offset from UTC, you must create a new time zone using the CreateCustomTimeZone method.

The BaseUtcOffset property differs from the GetUtcOffset method in the following ways:

• The BaseUtcOffset property returns the difference between UTC and the time zone's standard time; the GetUtcOffset method returns the difference between UTC and the time zone's time at a particular point in time.
• The GetUtcOffset method reflects the application of any adjustment rules to the time zone; the BaseUtcOffset property does not.

daylight_name()

const string & xtd::time_zone_info::daylight_name ( ) const

noexcept

Gets the display name for the current time zone's daylight saving time.

Returns

string The display name for the time zone's daylight saving time.

Remarks

The display name is localized based on the culture installed with the Windows operating system.

A DaylightName property whose value is not string.Empty or null does not necessarily indicate that the time zone supports daylight saving time. To determine whether the time zone supports daylight saving time, check the value of its SupportsDaylightSavingTime property.

In most cases, the DaylightName property of time zones defined in the registry is not string.Empty or null. However, the DaylightName property of custom time zones can be set to string.Empty. This occurs when custom time zones are created by the time_zone_info.CreateCustomTimeZone(string, TimeSpan, string, string) or the time_zone_info.CreateCustomTimeZone(string, TimeSpan, string, string, string, time_zone_info.AdjustmentRule[], Boolean) overload and the disableDaylightSavingTime parameter is true. Therefore, your code should never assume that the value of the DaylightName property is not null or empty.

The DaylightName property is equivalent to the DaylightName property of the TimeZone class.

display_name()

const string & xtd::time_zone_info::display_name ( ) const

noexcept

Gets the general display name that represents the time zone.

Returns

string The time zone's general display name.

Remarks

The display name is localized based on the culture installed with the Windows operating system.

Time zone display names for Windows system time zones follow a fairly standard format. The first portion of the display name is the time zone's base offset from Coordinated Universal Time, which is indicated by the acronym GMT (for Greenwich Mean Time), enclosed in parentheses. For Coordinated Universal Time, the GMT acronym with no offset is enclosed in parentheses. This is followed by a string that identifies the time zone or one or more of the cities, regions, or countries in the time zone. For example:

(GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London
(GMT+02:00) Athens, Beirut, Istanbul, Minsk
(GMT-02:00) Mid-Atlantic
(GMT-07:00) Mountain Time (US & Canada)

id()

const string & xtd::time_zone_info::id ( ) const

noexcept

Gets the time zone identifier.

Returns

string The time zone identifier.

Remarks

The time zone identifier is a key string that uniquely identifies a particular time zone. It can be passed as a parameter to the FindSystemTimeZoneById method to retrieve a particular time zone from the registry.

standard_name()

const string & xtd::time_zone_info::standard_name ( ) const

noexcept

Gets the display name for the time zone's standard time.

Returns

The display name of the time zone's standard time.

Remarks

The display name is localized based on the culture installed with the Windows operating system.

The StandardName property is identical to the StandardName property of the TimeZone class.

The value of the StandardName property is usually, but not always, identical to that of the Id property.

supports_daylight_saving_time()

bool xtd::time_zone_info::supports_daylight_saving_time ( ) const

noexcept

Gets a value indicating whether the time zone has any daylight saving time rules.*.

Returns

bool true if the time zone supports daylight saving time; otherwise, false.

Remarks

The value of the SupportsDaylightSavingTime property for the local time zone returned by the time_zone_info.Local property reflects the setting of the Control Panel Date and Time application's checkbox that defines whether the system automatically adjusts for daylight saving time. If it is unchecked, or if no checkbox is displayed for a time zone, the value of this property is false.

local()

static const time_zone_info & xtd::time_zone_info::local ( )

staticnoexcept

Gets a time_zone_info object that represents the local time zone.

Returns

time_zone_info An object that represents the local time zone.

utc()

static const time_zone_info & xtd::time_zone_info::utc ( )

staticnoexcept

Gets a time_zone_info object that represents the Coordinated Universal Time (UTC) zone.

Returns

time_zone_info An object that represents the Coordinated Universal Time (UTC) zone.

compare_to()

int32 xtd::time_zone_info::compare_to ( const time_zone_info &  obj ) const

overridevirtualnoexcept

Compares the current instance with another object of the same type.

Parameters

obj	An object to compare with this instance.

Returns

A 32-bit signed integer that indicates the relative order of the objects being compared. The return value has these meanings:

Value	Condition
Less than zero	This instance is less than obj.
Zero	This instance is equal to obj.
Greater than zero	This instance is greater than obj.

Implements xtd::icomparable< time_zone_info >.

equals() [1/3]

bool xtd::time_zone_info::equals ( const time_zone_info &  ) const

overridevirtualnoexcept

Indicates whether the current object is equal to another object of the same type.

Parameters

obj	An object to compare with this object.

Returns

true if the current object is equal to the other parameter; otherwise, false.

Implements xtd::iequatable< time_zone_info >.

get_adjustement_rules()

std::vector< adjustement_rule > xtd::time_zone_info::get_adjustement_rules ( ) const

noexcept

Retrieves an array of xtd::time_zone_info::adjustment_rule objects that apply to the current xtd::time_zone_info object.

Returns

An array of objects for this time zone.

is_daylight_saving_time()

bool xtd::time_zone_info::is_daylight_saving_time ( const xtd::date_time &  date_time ) const

noexcept

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current xtd::time_zone_info object.

Parameters

date_time

A date and time value.

Returns

true if the date_time parameter is a daylight saving time; otherwise, false.

to_string()

xtd::string xtd::time_zone_info::to_string ( ) const

overridevirtualnoexcept

Returns a xtd::string that represents the current object.

Returns

A string that represents the current object.

Examples

The following code example demonstrates what to_string returns.

#include <xtd/xtd>
 
using namespace xtd;
 
namespace examples {
  namespace object_test {
    class object1 : public object {
    };
  }
}
 
auto main() -> int {
  ptr<object> obj1 = new_ptr<examples::object_test::object1>();
  console::write_line(obj1->to_string());
 
  ptr<object> obj2 = new_ptr<date_time>(1971, 1, 5, 23, 5, 0);
  console::write_line(obj2->to_string());
 
  ptr<object> obj3 = new_ptr<boolean_object>();
  console::write_line(obj3->to_string());
}
 
// This code produces the following output :
//
// examples::object_test::object1
// Tue Jan  5 23:05:00 1971
// false

Reimplemented from xtd::object.

convert_time_to_utc()

static xtd::date_time xtd::time_zone_info::convert_time_to_utc ( const xtd::date_time &  date_time )

static

Converts the specified date and time to Coordinated Universal Time (UTC).

Parameters

dateTime

The date and time to convert.

Returns

date_time The Coordinated Universal Time (UTC) that corresponds to the dateTime parameter. The xtd::date_time value's Kind property is always set to xtd::date_timeKind.Utc.

Exceptions

ArgumentNullException	dateTime is null.
ArgumentException	time_zone_info::Local().IsInvalidxtd::date_time(dateTime) returns true.

get_system_time_zones()

static const std::list< time_zone_info > & xtd::time_zone_info::get_system_time_zones ( )

staticnoexcept

Returns a sorted collection of all the time zones about which information is available on the local system.

Returns

An read-only Array of time_zone_info objects.

convert_time() [1/2]

static xtd::date_time xtd::time_zone_info::convert_time ( const xtd::date_time &  date_time, const xtd::time_zone_info &  destination_time_zone  )

static

Converts a time to the time in a particular time zone.

Parameters

date_time	The date and time to convert.
destination_time_zone	The time zone to convert dateTime to.

Returns

The date and time in the destination time zone.

Exceptions

xtd::argument_exception

The value of the date_time parameter represents an invalid time.

convert_time() [2/2]

static xtd::date_time xtd::time_zone_info::convert_time ( const xtd::date_time &  date_time, const xtd::time_zone_info &  source_time_zone, const xtd::time_zone_info &  destination_time_zone  )

static

Converts a time from one time zone to another.

Parameters

date_time	The date and time to convert.
source_time_zone	The time zone of date_time.
destination_time_zone	The time zone to convert date_time to.

Returns

The date and time in the destination time zone that corresponds to the dateTime parameter in the source time zone.

Exceptions

xtd::argument_exception

The xtd::date_time::kind property of the date_time parameter is xtd::date_time_kind::local, but the source_time_tone parameter does not equal xtd::date_time_kind::local. -or- The xtd::date_time::kind property of the date_time parameter is xtd::date_time_kind::utc, but the source_time_zone parameter does not equal xtd::date_time_kind::utc. -or- The date_time parameter is an invalid time (that is, it represents a time that does not exist because of a time zone's adjustment rules).

convert_time_by_system_time_zone_id() [1/2]

static xtd::date_time xtd::time_zone_info::convert_time_by_system_time_zone_id ( const xtd::date_time &  date_time, const xtd::string &  destination_time_zone_id  )

static

Converts a time to the time in another time zone based on the time zone's identifier.

Parameters

date_time	The date and time to convert.
destination_time_zone_id	The identifier of the destination time zone.

Returns

The date and time in the destination time zone.

convert_time_by_system_time_zone_id() [2/2]

static xtd::date_time xtd::time_zone_info::convert_time_by_system_time_zone_id ( const xtd::date_time &  date_time, const xtd::string &  source_time_zone_id, const xtd::string &  destination_time_zone_id  )

static

Converts a time from one time zone to another based on time zone identifiers.

Parameters

date_time	The date and time to convert.
source_time_zone_id	The identifier of the source time zone.
destintion_time_zone_id	The identifier of the destination time zone.

Returns

The date and time in the destination time zone that corresponds to the dateTime parameter in the source time zone.

convert_from_utc()

static xtd::date_time xtd::time_zone_info::convert_from_utc ( const xtd::date_time &  date_time, const xtd::time_zone_info &  destination_time_zone  )

static

Converts a Coordinated Universal Time (UTC) to the time in a specified time zone.

Parameters

date_time	The Coordinated Universal Time (UTC).
destination_time_zone	The time zone to convert dateTime to.

Returns

The date and time in the destination time zone. Its xtd::date_time::kind property is xtd::date_time_kind::utc if destination_time_zone is xtd::date_time_kind::utc; otherwise, its xtd::date_time::kind property is xtd::date_time_kind::unspecified.

convert_to_utc() [1/2]

static xtd::date_time xtd::time_zone_info::convert_to_utc ( const xtd::date_time &  date_time, const xtd::time_zone_info &  source_time_zone  )

static

Converts the time in a specified time zone to Coordinated Universal Time (UTC).

Parameters

date_time	The date and time to convert.
source_time_zone	The time zone of dateTime.

Returns

The Coordinated Universal Time (UTC) that corresponds to the date_time parameter. The xtd::date_time object's xtd::date_time::kind property is always set to xtd::date_time_kind::utc.

convert_to_utc() [2/2]

static xtd::date_time xtd::time_zone_info::convert_to_utc ( const xtd::date_time &  date_time )

static

Converts the specified date and time to Coordinated Universal Time (UTC).

Parameters

date_time

The date and time to convert.

Returns

The Coordinated Universal Time (UTC) that corresponds to the date_time parameter. The xtd::date_time value's xtd::date_time::kind property is always set to xtd::date_time_kind::utc.

time_find_system_time_zone_by_id()

static time_zone_info xtd::time_zone_info::time_find_system_time_zone_by_id ( const string &  id )

static

Retrieves a time_zone_info object from the registry based on its identifier.

Parameters

id	The time zone identifier, which corresponds to the Id property.

Returns

An object whose identifier is the value of the id parameter.

Exceptions

ArgumentNullException	The id parameter is null.
TimeZoneNotFoundException	The time zone identifier specified by id was not found. This means that a registry key whose name matches id does not exist, or that the key exists but does not contain any time zone data.

equals() [2/3]

virtual bool xtd::object::equals ( const object &  obj ) const

virtualnoexcept

Determines whether the specified object is equal to the current object.

Parameters

obj	The object to compare with the current object.

Returns

true if the specified object is equal to the current object. otherwise, false.

Examples

The following code example compares the current instance with another object.

#include <xtd/console>
 
using namespace xtd;
 
auto main() -> int {
  auto object1 = new_ptr<object>();
  auto object2 = new_ptr<object>();
  
  auto object3 = object2;
  console::write_line(object1->equals(*object3));
  console::write_line(*object1 == *object3);
  object3 = object1;
  console::write_line(object1->equals(*object3));
  console::write_line(*object1 == *object3);
}
 
// This code produces the following output :
//
// false
// false
// true
// true

Reimplemented from xtd::object.

equals() [3/3]

template<typename object_a_t , typename object_b_t >

static bool xtd::object::equals ( const object_a_t &  object_a, const object_b_t &  object_b  )

inlinestaticnoexcept

Determines whether the specified object instances are considered equal.

Parameters

object_a	The first object to compare.
object_b	The second object to compare.

Returns

true if object_a is the same instance as object_b or if both are null references or if object_a(object_b) returns true. otherwise, false.

Examples

The following code example compares different objects.

#include <xtd/console>
 
using namespace xtd;
 
auto main() -> int {
  string s1 = "Tom";
  string s2 = "Carol";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "Tom";
  s2 = "Tom";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "";
  s2 = "Tom";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "Carol";
  s2 = "";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "";
  s2 = "";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
}
 
// This code produces the following output :
//
// object::equals("Tom", "Carol") => false
// object::equals("Tom", "Tom") => true
// object::equals("", "Tom") => false
// object::equals("Carol", "") => false
// object::equals("", "") => true

---

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

• xtd.core/include/xtd/time_zone_info.h