SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar. More...

#include <simpletz.h>

Inheritance diagram for icu::SimpleTimeZone:

Public Types
enum	TimeMode { WALL_TIME = 0 , STANDARD_TIME , UTC_TIME }
	TimeMode is used, together with a millisecond offset after midnight, to specify a rule transition time. More...

Public Types inherited from icu::BasicTimeZone
enum	{ kStandard = 0x01 , kDaylight = 0x03 , kFormer = 0x04 , kLatter = 0x0C }
	The time type option bit flags used by getOffsetFromLocal. More...

Public Types inherited from icu::TimeZone
enum	EDisplayType { SHORT = 1 , LONG , SHORT_GENERIC , LONG_GENERIC , SHORT_GMT , LONG_GMT , SHORT_COMMONLY_USED , GENERIC_LOCATION }
	Enum for use with getDisplayName. More...

Public Member Functions
	SimpleTimeZone (const SimpleTimeZone &source)
	Copy constructor.

SimpleTimeZone &	operator= (const SimpleTimeZone &right)
	Default assignment operator.

virtual	~SimpleTimeZone ()
	Destructor.

virtual bool	operator== (const TimeZone &that) const override
	Returns true if the two TimeZone objects are equal; that is, they have the same ID, raw GMT offset, and DST rules.

	SimpleTimeZone (int32_t rawOffsetGMT, const UnicodeString &ID)
	Constructs a SimpleTimeZone with the given raw GMT offset and time zone ID, and which doesn't observe daylight savings time.

	SimpleTimeZone (int32_t rawOffsetGMT, const UnicodeString &ID, int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth, int8_t savingsStartDayOfWeek, int32_t savingsStartTime, int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth, int8_t savingsEndDayOfWeek, int32_t savingsEndTime, UErrorCode &status)
	Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

	SimpleTimeZone (int32_t rawOffsetGMT, const UnicodeString &ID, int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth, int8_t savingsStartDayOfWeek, int32_t savingsStartTime, int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth, int8_t savingsEndDayOfWeek, int32_t savingsEndTime, int32_t savingsDST, UErrorCode &status)
	Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

	SimpleTimeZone (int32_t rawOffsetGMT, const UnicodeString &ID, int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth, int8_t savingsStartDayOfWeek, int32_t savingsStartTime, TimeMode savingsStartTimeMode, int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth, int8_t savingsEndDayOfWeek, int32_t savingsEndTime, TimeMode savingsEndTimeMode, int32_t savingsDST, UErrorCode &status)
	Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

void	setStartYear (int32_t year)
	Sets the daylight savings starting year, that is, the year this time zone began observing its specified daylight savings time rules.

void	setStartRule (int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek, int32_t time, UErrorCode &status)
	Sets the daylight savings starting rule.

void	setStartRule (int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek, int32_t time, TimeMode mode, UErrorCode &status)
	Sets the daylight savings starting rule.

void	setStartRule (int32_t month, int32_t dayOfMonth, int32_t time, UErrorCode &status)
	Sets the DST start rule to a fixed date within a month.

void	setStartRule (int32_t month, int32_t dayOfMonth, int32_t time, TimeMode mode, UErrorCode &status)
	Sets the DST start rule to a fixed date within a month.

void	setStartRule (int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, int32_t time, UBool after, UErrorCode &status)
	Sets the DST start rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

void	setStartRule (int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, int32_t time, TimeMode mode, UBool after, UErrorCode &status)
	Sets the DST start rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

void	setEndRule (int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek, int32_t time, UErrorCode &status)
	Sets the daylight savings ending rule.

void	setEndRule (int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek, int32_t time, TimeMode mode, UErrorCode &status)
	Sets the daylight savings ending rule.

void	setEndRule (int32_t month, int32_t dayOfMonth, int32_t time, UErrorCode &status)
	Sets the DST end rule to a fixed date within a month.

void	setEndRule (int32_t month, int32_t dayOfMonth, int32_t time, TimeMode mode, UErrorCode &status)
	Sets the DST end rule to a fixed date within a month.

void	setEndRule (int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, int32_t time, UBool after, UErrorCode &status)
	Sets the DST end rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

void	setEndRule (int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, int32_t time, TimeMode mode, UBool after, UErrorCode &status)
	Sets the DST end rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

virtual int32_t	getOffset (uint8_t era, int32_t year, int32_t month, int32_t day, uint8_t dayOfWeek, int32_t millis, UErrorCode &status) const override
	Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add to GMT to get local time in this time zone, taking daylight savings time into account) as of a particular reference date.

virtual int32_t	getOffset (uint8_t era, int32_t year, int32_t month, int32_t day, uint8_t dayOfWeek, int32_t milliseconds, int32_t monthLength, UErrorCode &status) const override
	Gets the time zone offset, for current date, modified in case of daylight savings.

virtual int32_t	getOffset (uint8_t era, int32_t year, int32_t month, int32_t day, uint8_t dayOfWeek, int32_t milliseconds, int32_t monthLength, int32_t prevMonthLength, UErrorCode &status) const
	Gets the time zone offset, for current date, modified in case of daylight savings.

virtual void	getOffset (UDate date, UBool local, int32_t &rawOffset, int32_t &dstOffset, UErrorCode &ec) const override
	Redeclared TimeZone method.

virtual void	getOffsetFromLocal (UDate date, UTimeZoneLocalOption nonExistingTimeOpt, UTimeZoneLocalOption duplicatedTimeOpt, int32_t &rawOffset, int32_t &dstOffset, UErrorCode &status) const override
	Get time zone offsets from local wall time.

virtual int32_t	getRawOffset () const override
	Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add to GMT to get local time, before taking daylight savings time into account).

virtual void	setRawOffset (int32_t offsetMillis) override
	Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add to GMT to get local time, before taking daylight savings time into account).

void	setDSTSavings (int32_t millisSavedDuringDST, UErrorCode &status)
	Sets the amount of time in ms that the clock is advanced during DST.

virtual int32_t	getDSTSavings () const override
	Returns the amount of time in ms that the clock is advanced during DST.

virtual UBool	useDaylightTime () const override
	Queries if this TimeZone uses Daylight Savings Time.

virtual UBool	inDaylightTime (UDate date, UErrorCode &status) const override
	Returns true if the given date is within the period when daylight savings time is in effect; false otherwise.

UBool	hasSameRules (const TimeZone &other) const override
	Return true if this zone has the same rules and offset as another zone.

virtual SimpleTimeZone *	clone () const override
	Clones TimeZone objects polymorphically.

virtual UBool	getNextTransition (UDate base, UBool inclusive, TimeZoneTransition &result) const override
	Gets the first time zone transition after the base time.

virtual UBool	getPreviousTransition (UDate base, UBool inclusive, TimeZoneTransition &result) const override
	Gets the most recent time zone transition before the base time.

virtual int32_t	countTransitionRules (UErrorCode &status) const override
	Returns the number of `TimeZoneRule`s which represents time transitions, for this time zone, that is, all `TimeZoneRule`s for this time zone except `InitialTimeZoneRule`.

virtual void	getTimeZoneRules (const InitialTimeZoneRule &initial, const TimeZoneRule trsrules[], int32_t &trscount, UErrorCode &status) const override
	Gets the `InitialTimeZoneRule` and the set of `TimeZoneRule` which represent time transitions for this time zone.

virtual UClassID	getDynamicClassID () const override
	Override TimeZone Returns a unique class ID POLYMORPHICALLY.

Public Member Functions inherited from icu::BasicTimeZone
virtual	~BasicTimeZone ()
	Destructor.

virtual UBool	hasEquivalentTransitions (const BasicTimeZone &tz, UDate start, UDate end, UBool ignoreDstAmount, UErrorCode &ec) const
	Checks if the time zone has equivalent transitions in the time range.

virtual void	getSimpleRulesNear (UDate date, InitialTimeZoneRule &initial, AnnualTimeZoneRule &std, AnnualTimeZoneRule *&dst, UErrorCode &status) const
	Gets the set of time zone rules valid at the specified time.

void	getOffsetFromLocal (UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt, int32_t &rawOffset, int32_t &dstOffset, UErrorCode &status) const
	Get time zone offsets from local wall time.

Public Member Functions inherited from icu::TimeZone
virtual	~TimeZone ()

bool	operator!= (const TimeZone &that) const
	Returns true if the two TimeZones are NOT equal; that is, if operator==() returns false.

UnicodeString &	getID (UnicodeString &ID) const
	Fills in "ID" with the TimeZone's ID.

void	setID (const UnicodeString &ID)
	Sets the TimeZone's ID to the specified value.

UnicodeString &	getDisplayName (UnicodeString &result) const
	Returns a name of this time zone suitable for presentation to the user in the default locale.

UnicodeString &	getDisplayName (const Locale &locale, UnicodeString &result) const
	Returns a name of this time zone suitable for presentation to the user in the specified locale.

UnicodeString &	getDisplayName (UBool inDaylight, EDisplayType style, UnicodeString &result) const
	Returns a name of this time zone suitable for presentation to the user in the default locale.

UnicodeString &	getDisplayName (UBool inDaylight, EDisplayType style, const Locale &locale, UnicodeString &result) const
	Returns a name of this time zone suitable for presentation to the user in the specified locale.

Public Member Functions inherited from icu::UObject
virtual	~UObject ()
	Destructor.

Static Public Member Functions
static UClassID	getStaticClassID ()
	Return the class ID for this class.

Static Public Member Functions inherited from icu::TimeZone
static const TimeZone &	getUnknown ()
	Returns the "unknown" time zone.

static const TimeZone *	getGMT ()
	The GMT (=UTC) time zone has a raw offset of zero and does not use daylight savings time.

static TimeZone *	createTimeZone (const UnicodeString &ID)
	Creates a `TimeZone` for the given ID.

static StringEnumeration *	createTimeZoneIDEnumeration (USystemTimeZoneType zoneType, const char region, const int32_t rawOffset, UErrorCode &ec)
	Returns an enumeration over system time zone IDs with the given filter conditions.

static StringEnumeration *	createEnumeration ()
	Returns an enumeration over all recognized time zone IDs.

static StringEnumeration *	createEnumeration (UErrorCode &status)
	Returns an enumeration over all recognized time zone IDs.

static StringEnumeration *	createEnumeration (int32_t rawOffset)
	Returns an enumeration over time zone IDs with a given raw offset from GMT.

static StringEnumeration *	createEnumerationForRawOffset (int32_t rawOffset, UErrorCode &status)
	Returns an enumeration over time zone IDs with a given raw offset from GMT.

static StringEnumeration *	createEnumeration (const char *region)
	Returns an enumeration over time zone IDs associated with the given region.

static StringEnumeration *	createEnumerationForRegion (const char *region, UErrorCode &status)
	Returns an enumeration over time zone IDs associated with the given region.

static int32_t	countEquivalentIDs (const UnicodeString &id)
	Returns the number of IDs in the equivalency group that includes the given ID.

static const UnicodeString	getEquivalentID (const UnicodeString &id, int32_t index)
	Returns an ID in the equivalency group that includes the given ID.

static TimeZone *	detectHostTimeZone ()
	Creates an instance of TimeZone detected from the current host system configuration.

static TimeZone *	createDefault ()
	Creates a new copy of the default TimeZone for this host.

static TimeZone *	forLocaleOrDefault (const Locale &locale)
	If the locale contains the timezone keyword, creates a copy of that TimeZone.

static void	adoptDefault (TimeZone *zone)
	Sets the default time zone (i.e., what's returned by createDefault()) to be the specified time zone.

static void	setDefault (const TimeZone &zone)
	Same as adoptDefault(), except that the TimeZone object passed in is NOT adopted; the caller remains responsible for deleting it.

static const char *	getTZDataVersion (UErrorCode &status)
	Returns the timezone data version currently used by ICU.

static UnicodeString &	getCanonicalID (const UnicodeString &id, UnicodeString &canonicalID, UErrorCode &status)
	Returns the canonical system timezone ID or the normalized custom time zone ID for the given time zone ID.

static UnicodeString &	getCanonicalID (const UnicodeString &id, UnicodeString &canonicalID, UBool &isSystemID, UErrorCode &status)
	Returns the canonical system time zone ID or the normalized custom time zone ID for the given time zone ID.

static UnicodeString &	getIanaID (const UnicodeString &id, UnicodeString &ianaID, UErrorCode &status)
	Returns the preferred time zone ID in the IANA time zone database for the given time zone ID.

static UnicodeString &	getWindowsID (const UnicodeString &id, UnicodeString &winid, UErrorCode &status)
	Converts a system time zone ID to an equivalent Windows time zone ID.

static UnicodeString &	getIDForWindowsID (const UnicodeString &winid, const char *region, UnicodeString &id, UErrorCode &status)
	Converts a Windows time zone ID to an equivalent system time zone ID for a region.

static UClassID	getStaticClassID ()
	Return the class ID for this class.

static int32_t	getRegion (const UnicodeString &id, char *region, int32_t capacity, UErrorCode &status)
	Gets the region code associated with the given system time zone ID.

static const char16_t *	getRegion (const UnicodeString &id, UErrorCode &status)
	Returns the region code associated with the given zone, or nullptr if the zone is not known.

Additional Inherited Members
Protected Member Functions inherited from icu::BasicTimeZone
	BasicTimeZone ()
	Default constructor.

	BasicTimeZone (const UnicodeString &id)
	Construct a timezone with a given ID.

	BasicTimeZone (const BasicTimeZone &source)
	Copy constructor.

BasicTimeZone &	operator= (const BasicTimeZone &)=default
	Copy assignment.

void	getTimeZoneRulesAfter (UDate start, InitialTimeZoneRule &initial, UVector &transitionRules, UErrorCode &status) const
	Gets the set of TimeZoneRule instances applicable to the specified time and after.

Protected Member Functions inherited from icu::TimeZone
	TimeZone ()
	Default constructor.

	TimeZone (const UnicodeString &id)
	Construct a TimeZone with a given ID.

	TimeZone (const TimeZone &source)
	Copy constructor.

TimeZone &	operator= (const TimeZone &right)
	Default assignment operator.

Static Protected Member Functions inherited from icu::TimeZone
static UResourceBundle *	loadRule (const UResourceBundle top, const UnicodeString &ruleid, UResourceBundle oldbundle, UErrorCode &status)
	Utility function.

Static Protected Attributes inherited from icu::BasicTimeZone
static constexpr int32_t	kStdDstMask = kDaylight
	A time type option bit mask used by getOffsetFromLocal.

static constexpr int32_t	kFormerLatterMask = kLatter
	A time type option bit mask used by getOffsetFromLocal.

Detailed Description

SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.

This class does not handle historical changes.

When specifying daylight-savings-time begin and end dates, use a negative value for dayOfWeekInMonth to indicate that SimpleTimeZone should count from the end of the month backwards. For example, if Daylight Savings Time starts or ends at the last Sunday a month, use dayOfWeekInMonth = -1 along with dayOfWeek = UCAL_SUNDAY to specify the rule.

See also: Calendar; GregorianCalendar; TimeZone

Author: D. Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu

Definition at line 65 of file simpletz.h.

Member Enumeration Documentation

◆ TimeMode

enum icu::SimpleTimeZone::TimeMode

TimeMode is used, together with a millisecond offset after midnight, to specify a rule transition time.

Most rules transition at a local wall time, that is, according to the current time in effect, either standard, or DST. However, some rules transition at local standard time, and some at a specific UTC time. Although it might seem that all times could be converted to wall time, thus eliminating the need for this parameter, this is not the case.

Stable:: ICU 2.0

Definition at line 79 of file simpletz.h.

Constructor & Destructor Documentation

◆ SimpleTimeZone() [1/5]

icu::SimpleTimeZone::SimpleTimeZone ( const SimpleTimeZone & source )

Copy constructor.

Parameters

source the object to be copied.

Stable:: ICU 2.0

◆ ~SimpleTimeZone()

virtual icu::SimpleTimeZone::~SimpleTimeZone ( )

virtual

Destructor.

Stable:: ICU 2.0

◆ SimpleTimeZone() [2/5]

icu::SimpleTimeZone::SimpleTimeZone	(	int32_t	rawOffsetGMT,
		const UnicodeString &	ID
	)

Constructs a SimpleTimeZone with the given raw GMT offset and time zone ID, and which doesn't observe daylight savings time.

Normally you should use TimeZone::createInstance() to create a TimeZone instead of creating a SimpleTimeZone directly with this constructor.

Parameters

rawOffsetGMT	The given base time zone offset to GMT.
ID	The timezone ID which is obtained from TimeZone.getAvailableIDs.

Stable:: ICU 2.0

◆ SimpleTimeZone() [3/5]

icu::SimpleTimeZone::SimpleTimeZone	(	int32_t	rawOffsetGMT,
		const UnicodeString &	ID,
		int8_t	savingsStartMonth,
		int8_t	savingsStartDayOfWeekInMonth,
		int8_t	savingsStartDayOfWeek,
		int32_t	savingsStartTime,
		int8_t	savingsEndMonth,
		int8_t	savingsEndDayOfWeekInMonth,
		int8_t	savingsEndDayOfWeek,
		int32_t	savingsEndTime,
		UErrorCode &	status
	)

Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

To create a TimeZone that doesn't observe daylight savings time, don't use this constructor; use SimpleTimeZone(rawOffset, ID) instead. Normally, you should use TimeZone.createInstance() to create a TimeZone instead of creating a SimpleTimeZone directly with this constructor.

Various types of daylight-savings time rules can be specified by using different values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a complete explanation of how these parameters work, see the documentation for setStartRule().

Parameters

rawOffsetGMT	The new SimpleTimeZone's raw GMT offset
ID	The new SimpleTimeZone's time zone ID.
savingsStartMonth	The daylight savings starting month. Month is 0-based. eg, 0 for January.
savingsStartDayOfWeekInMonth	The daylight savings starting day-of-week-in-month. See setStartRule() for a complete explanation.
savingsStartDayOfWeek	The daylight savings starting day-of-week. See setStartRule() for a complete explanation.
savingsStartTime	The daylight savings starting time, expressed as the number of milliseconds after midnight.
savingsEndMonth	The daylight savings ending month. Month is 0-based. eg, 0 for January.
savingsEndDayOfWeekInMonth	The daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
savingsEndDayOfWeek	The daylight savings ending day-of-week. See setStartRule() for a complete explanation.
savingsEndTime	The daylight savings ending time, expressed as the number of milliseconds after midnight.
status	An UErrorCode to receive the status.

Stable:: ICU 2.0

◆ SimpleTimeZone() [4/5]

icu::SimpleTimeZone::SimpleTimeZone	(	int32_t	rawOffsetGMT,
		const UnicodeString &	ID,
		int8_t	savingsStartMonth,
		int8_t	savingsStartDayOfWeekInMonth,
		int8_t	savingsStartDayOfWeek,
		int32_t	savingsStartTime,
		int8_t	savingsEndMonth,
		int8_t	savingsEndDayOfWeekInMonth,
		int8_t	savingsEndDayOfWeek,
		int32_t	savingsEndTime,
		int32_t	savingsDST,
		UErrorCode &	status
	)

Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

To create a TimeZone that doesn't observe daylight savings time, don't use this constructor; use SimpleTimeZone(rawOffset, ID) instead. Normally, you should use TimeZone.createInstance() to create a TimeZone instead of creating a SimpleTimeZone directly with this constructor.

Various types of daylight-savings time rules can be specified by using different values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a complete explanation of how these parameters work, see the documentation for setStartRule().

Parameters

rawOffsetGMT	The new SimpleTimeZone's raw GMT offset
ID	The new SimpleTimeZone's time zone ID.
savingsStartMonth	The daylight savings starting month. Month is 0-based. eg, 0 for January.
savingsStartDayOfWeekInMonth	The daylight savings starting day-of-week-in-month. See setStartRule() for a complete explanation.
savingsStartDayOfWeek	The daylight savings starting day-of-week. See setStartRule() for a complete explanation.
savingsStartTime	The daylight savings starting time, expressed as the number of milliseconds after midnight.
savingsEndMonth	The daylight savings ending month. Month is 0-based. eg, 0 for January.
savingsEndDayOfWeekInMonth	The daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
savingsEndDayOfWeek	The daylight savings ending day-of-week. See setStartRule() for a complete explanation.
savingsEndTime	The daylight savings ending time, expressed as the number of milliseconds after midnight.
savingsDST	The number of milliseconds added to standard time to get DST time. Default is one hour.
status	An UErrorCode to receive the status.

Stable:: ICU 2.0

◆ SimpleTimeZone() [5/5]

icu::SimpleTimeZone::SimpleTimeZone	(	int32_t	rawOffsetGMT,
		const UnicodeString &	ID,
		int8_t	savingsStartMonth,
		int8_t	savingsStartDayOfWeekInMonth,
		int8_t	savingsStartDayOfWeek,
		int32_t	savingsStartTime,
		TimeMode	savingsStartTimeMode,
		int8_t	savingsEndMonth,
		int8_t	savingsEndDayOfWeekInMonth,
		int8_t	savingsEndDayOfWeek,
		int32_t	savingsEndTime,
		TimeMode	savingsEndTimeMode,
		int32_t	savingsDST,
		UErrorCode &	status
	)

Construct a SimpleTimeZone with the given raw GMT offset, time zone ID, and times to start and end daylight savings time.

To create a TimeZone that doesn't observe daylight savings time, don't use this constructor; use SimpleTimeZone(rawOffset, ID) instead. Normally, you should use TimeZone.createInstance() to create a TimeZone instead of creating a SimpleTimeZone directly with this constructor.

Various types of daylight-savings time rules can be specified by using different values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a complete explanation of how these parameters work, see the documentation for setStartRule().

Parameters

rawOffsetGMT	The new SimpleTimeZone's raw GMT offset
ID	The new SimpleTimeZone's time zone ID.
savingsStartMonth	The daylight savings starting month. Month is 0-based. eg, 0 for January.
savingsStartDayOfWeekInMonth	The daylight savings starting day-of-week-in-month. See setStartRule() for a complete explanation.
savingsStartDayOfWeek	The daylight savings starting day-of-week. See setStartRule() for a complete explanation.
savingsStartTime	The daylight savings starting time, expressed as the number of milliseconds after midnight.
savingsStartTimeMode	Whether the start time is local wall time, local standard time, or UTC time. Default is local wall time.
savingsEndMonth	The daylight savings ending month. Month is 0-based. eg, 0 for January.
savingsEndDayOfWeekInMonth	The daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
savingsEndDayOfWeek	The daylight savings ending day-of-week. See setStartRule() for a complete explanation.
savingsEndTime	The daylight savings ending time, expressed as the number of milliseconds after midnight.
savingsEndTimeMode	Whether the end time is local wall time, local standard time, or UTC time. Default is local wall time.
savingsDST	The number of milliseconds added to standard time to get DST time. Default is one hour.
status	An UErrorCode to receive the status.

Stable:: ICU 2.0

Member Function Documentation

◆ clone()

virtual SimpleTimeZone * icu::SimpleTimeZone::clone ( ) const

overridevirtual

Clones TimeZone objects polymorphically.

Clients are responsible for deleting the TimeZone object cloned.

Returns: A new copy of this TimeZone object.

Stable:: ICU 2.0

Implements icu::BasicTimeZone.

◆ countTransitionRules()

virtual int32_t icu::SimpleTimeZone::countTransitionRules ( UErrorCode & status ) const

overridevirtual

Returns the number of TimeZoneRules which represents time transitions, for this time zone, that is, all TimeZoneRules for this time zone except InitialTimeZoneRule.

The return value range is 0 or any positive value.

Parameters

status Receives error status code.

Returns: The number of TimeZoneRules representing time transitions.

Stable:: ICU 3.8

Implements icu::BasicTimeZone.

◆ getDSTSavings()

virtual int32_t icu::SimpleTimeZone::getDSTSavings ( ) const

overridevirtual

Returns the amount of time in ms that the clock is advanced during DST.

Returns: the number of milliseconds the time is advanced with respect to standard time when the daylight savings rules are in effect. Typically one hour (+3600000). The amount could be negative, but not 0.

Stable:: ICU 2.0

Reimplemented from icu::TimeZone.

◆ getDynamicClassID()

virtual UClassID icu::SimpleTimeZone::getDynamicClassID ( ) const

overridevirtual

Override TimeZone Returns a unique class ID POLYMORPHICALLY.

Pure virtual override. This method is to implement a simple version of RTTI, since not all C++ compilers support genuine RTTI. Polymorphic operator==() and clone() methods call this method.

Returns: The class ID for this object. All objects of a given class have the same class ID. Objects of other classes have different class IDs.

Stable:: ICU 2.0

Implements icu::TimeZone.

◆ getNextTransition()

virtual UBool icu::SimpleTimeZone::getNextTransition	(	UDate	base,
		UBool	inclusive,
		TimeZoneTransition &	result
	)		const

overridevirtual

Gets the first time zone transition after the base time.

Parameters

base	The base time.
inclusive	Whether the base time is inclusive or not.
result	Receives the first transition after the base time.

Returns: true if the transition is found.

Stable:: ICU 3.8

Implements icu::BasicTimeZone.

◆ getOffset() [1/4]

void icu::SimpleTimeZone::getOffset	(	UDate	date,
		UBool	local,
		int32_t &	rawOffset,
		int32_t &	dstOffset,
		UErrorCode &	ec
	)		const

inlineoverridevirtual

Redeclared TimeZone method.

This implementation simply calls the base class method, which otherwise would be hidden.

Stable:: ICU 2.8

Reimplemented from icu::TimeZone.

Definition at line 929 of file simpletz.h.

◆ getOffset() [2/4]

virtual int32_t icu::SimpleTimeZone::getOffset	(	uint8_t	era,
		int32_t	year,
		int32_t	month,
		int32_t	day,
		uint8_t	dayOfWeek,
		int32_t	millis,
		UErrorCode &	status
	)		const

overridevirtual

Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add to GMT to get local time in this time zone, taking daylight savings time into account) as of a particular reference date.

The reference date is used to determine whether daylight savings time is in effect and needs to be figured into the offset that is returned (in other words, what is the adjusted GMT offset in this time zone at this particular date and time?). For the time zones produced by createTimeZone(), the reference data is specified according to the Gregorian calendar, and the date and time fields are in GMT, NOT local time.

Parameters

era	The reference date's era
year	The reference date's year
month	The reference date's month (0-based; 0 is January)
day	The reference date's day-in-month (1-based)
dayOfWeek	The reference date's day-of-week (1-based; 1 is Sunday)
millis	The reference date's milliseconds in day, UTT (NOT local time).
status	An UErrorCode to receive the status.

Returns: The offset in milliseconds to add to GMT to get local time.

Stable:: ICU 2.0

Implements icu::TimeZone.

◆ getOffset() [3/4]

virtual int32_t icu::SimpleTimeZone::getOffset	(	uint8_t	era,
		int32_t	year,
		int32_t	month,
		int32_t	day,
		uint8_t	dayOfWeek,
		int32_t	milliseconds,
		int32_t	monthLength,
		int32_t	prevMonthLength,
		UErrorCode &	status
	)		const

virtual

Gets the time zone offset, for current date, modified in case of daylight savings.

This is the offset to add to UTC to get local time.

Parameters

era	the era of the given date.
year	the year in the given date.
month	the month in the given date. Month is 0-based. e.g., 0 for January.
day	the day-in-month of the given date.
dayOfWeek	the day-of-week of the given date.
milliseconds	the millis in day in standard local time.
monthLength	the length of the given month in days.
prevMonthLength	length of the previous month in days.
status	An UErrorCode to receive the status.

Returns: the offset to add to GMT to get local time.

Stable:: ICU 2.0

◆ getOffset() [4/4]

virtual int32_t icu::SimpleTimeZone::getOffset	(	uint8_t	era,
		int32_t	year,
		int32_t	month,
		int32_t	day,
		uint8_t	dayOfWeek,
		int32_t	milliseconds,
		int32_t	monthLength,
		UErrorCode &	status
	)		const

overridevirtual

Gets the time zone offset, for current date, modified in case of daylight savings.

This is the offset to add to UTC to get local time.

Parameters

era	the era of the given date.
year	the year in the given date.
month	the month in the given date. Month is 0-based. e.g., 0 for January.
day	the day-in-month of the given date.
dayOfWeek	the day-of-week of the given date.
milliseconds	the millis in day in standard local time.
monthLength	the length of the given month in days.
status	An UErrorCode to receive the status.

Returns: the offset to add to GMT to get local time.

Stable:: ICU 2.0

Implements icu::TimeZone.

◆ getOffsetFromLocal()

virtual void icu::SimpleTimeZone::getOffsetFromLocal	(	UDate	date,
		UTimeZoneLocalOption	nonExistingTimeOpt,
		UTimeZoneLocalOption	duplicatedTimeOpt,
		int32_t &	rawOffset,
		int32_t &	dstOffset,
		UErrorCode &	status
	)		const

overridevirtual

Get time zone offsets from local wall time.

Stable:: ICU 69

Reimplemented from icu::BasicTimeZone.

◆ getPreviousTransition()

virtual UBool icu::SimpleTimeZone::getPreviousTransition	(	UDate	base,
		UBool	inclusive,
		TimeZoneTransition &	result
	)		const

overridevirtual

Gets the most recent time zone transition before the base time.

Parameters

base	The base time.
inclusive	Whether the base time is inclusive or not.
result	Receives the most recent transition before the base time.

Returns: true if the transition is found.

Stable:: ICU 3.8

Implements icu::BasicTimeZone.

◆ getRawOffset()

virtual int32_t icu::SimpleTimeZone::getRawOffset ( ) const

overridevirtual

Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add to GMT to get local time, before taking daylight savings time into account).

Returns: The TimeZone's raw GMT offset.

Stable:: ICU 2.0

Implements icu::TimeZone.

◆ getStaticClassID()

static UClassID icu::SimpleTimeZone::getStaticClassID ( )

static

Return the class ID for this class.

This is useful only for comparing to a return value from getDynamicClassID(). For example:

.   Base* polymorphic_pointer = createPolymorphicObject();
.   if (polymorphic_pointer->getDynamicClassID() ==
.       Derived::getStaticClassID()) ...

Returns: The class ID for all objects of this class.

Stable:: ICU 2.0

◆ getTimeZoneRules()

virtual void icu::SimpleTimeZone::getTimeZoneRules	(	const InitialTimeZoneRule *&	initial,
		const TimeZoneRule *	trsrules[],
		int32_t &	trscount,
		UErrorCode &	status
	)		const

overridevirtual

Gets the InitialTimeZoneRule and the set of TimeZoneRule which represent time transitions for this time zone.

On successful return, the argument initial points to non-nullptr InitialTimeZoneRule and the array trsrules is filled with 0 or multiple TimeZoneRule instances up to the size specified by trscount. The results are referencing the rule instance held by this time zone instance. Therefore, after this time zone is destructed, they are no longer available.

Parameters

initial	Receives the initial timezone rule
trsrules	Receives the timezone transition rules
trscount	On input, specify the size of the array 'transitions' receiving the timezone transition rules. On output, actual number of rules filled in the array will be set.
status	Receives error status code.

Stable:: ICU 3.8

Implements icu::BasicTimeZone.

◆ hasSameRules()

UBool icu::SimpleTimeZone::hasSameRules ( const TimeZone & other ) const

overridevirtual

Return true if this zone has the same rules and offset as another zone.

Parameters

other the TimeZone object to be compared with

Returns: true if the given zone has the same rules and offset as this one

Stable:: ICU 2.0

Reimplemented from icu::TimeZone.

◆ inDaylightTime()

virtual UBool icu::SimpleTimeZone::inDaylightTime	(	UDate	date,
		UErrorCode &	status
	)		const

overridevirtual

Returns true if the given date is within the period when daylight savings time is in effect; false otherwise.

If the TimeZone doesn't observe daylight savings time, this functions always returns false. This method is wasteful since it creates a new GregorianCalendar and deletes it each time it is called. This is a deprecated method and provided only for Java compatibility.

Parameters

date	The date to test.
status	An UErrorCode to receive the status.

Returns: true if the given date is in Daylight Savings Time; false otherwise.

Deprecated:: ICU 2.4. Use Calendar::inDaylightTime() instead.

Implements icu::TimeZone.

◆ operator=()

SimpleTimeZone & icu::SimpleTimeZone::operator= ( const SimpleTimeZone & right )

Default assignment operator.

Parameters

right the object to be copied.

Stable:: ICU 2.0

◆ operator==()

virtual bool icu::SimpleTimeZone::operator== ( const TimeZone & that ) const

overridevirtual

Returns true if the two TimeZone objects are equal; that is, they have the same ID, raw GMT offset, and DST rules.

Parameters

that	The SimpleTimeZone object to be compared with.

Returns: true if the given time zone is equal to this time zone; false otherwise.

Stable:: ICU 2.0

Reimplemented from icu::TimeZone.

◆ setDSTSavings()

void icu::SimpleTimeZone::setDSTSavings	(	int32_t	millisSavedDuringDST,
		UErrorCode &	status
	)

Sets the amount of time in ms that the clock is advanced during DST.

Parameters

millisSavedDuringDST	the number of milliseconds the time is advanced with respect to standard time when the daylight savings rules are in effect. Typically one hour (+3600000). The amount could be negative, but not 0.
status	An UErrorCode to receive the status.

Stable:: ICU 2.0

◆ setEndRule() [1/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		TimeMode	mode,
		UBool	after,
		UErrorCode &	status
	)

Sets the DST end rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	A date within that month (1-based).
dayOfWeek	The day of the week on which this rule occurs.
time	The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
after	If true, this rule selects the first dayOfWeek on or after dayOfMonth. If false, this rule selects the last dayOfWeek on or before dayOfMonth.
status	An UErrorCode

Stable:: ICU 2.0

◆ setEndRule() [2/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		UBool	after,
		UErrorCode &	status
	)

inline

Sets the DST end rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	A date within that month (1-based).
dayOfWeek	The day of the week on which this rule occurs.
time	The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
after	If true, this rule selects the first dayOfWeek on or after dayOfMonth. If false, this rule selects the last dayOfWeek on or before dayOfMonth.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 923 of file simpletz.h.

◆ setEndRule() [3/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	time,
		TimeMode	mode,
		UErrorCode &	status
	)

Sets the DST end rule to a fixed date within a month.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	The date in that month (1-based).
time	The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
status	An UErrorCode

Stable:: ICU 2.0

◆ setEndRule() [4/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	time,
		UErrorCode &	status
	)

inline

Sets the DST end rule to a fixed date within a month.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	The date in that month (1-based).
time	The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 918 of file simpletz.h.

◆ setEndRule() [5/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfWeekInMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		TimeMode	mode,
		UErrorCode &	status
	)

Sets the daylight savings ending rule.

For example, if Daylight Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time. Therefore, you can set the end rule by calling:

   setEndRule(UCAL_OCTOBER, -1, UCAL_SUNDAY, 2*60*60*1000);

Various other types of rules can be specified by manipulating the dayOfWeek and dayOfWeekInMonth parameters. For complete details, see the documentation for setStartRule().

Parameters

month	the daylight savings ending month. Month is 0-based. eg, 0 for January.
dayOfWeekInMonth	the daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
dayOfWeek	the daylight savings ending day-of-week. See setStartRule() for a complete explanation.
time	the daylight savings ending time. Please see the member description for an example.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
status	An UErrorCode

Stable:: ICU 2.0

◆ setEndRule() [6/6]

void icu::SimpleTimeZone::setEndRule	(	int32_t	month,
		int32_t	dayOfWeekInMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		UErrorCode &	status
	)

inline

Sets the daylight savings ending rule.

For example, if Daylight Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time. Therefore, you can set the end rule by calling:

   setEndRule(UCAL_OCTOBER, -1, UCAL_SUNDAY, 2*60*60*1000);

Various other types of rules can be specified by manipulating the dayOfWeek and dayOfWeekInMonth parameters. For complete details, see the documentation for setStartRule().

Parameters

month	the daylight savings ending month. Month is 0-based. eg, 0 for January.
dayOfWeekInMonth	the daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
dayOfWeek	the daylight savings ending day-of-week. See setStartRule() for a complete explanation.
time	the daylight savings ending time. Please see the member description for an example.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 912 of file simpletz.h.

◆ setRawOffset()

virtual void icu::SimpleTimeZone::setRawOffset ( int32_t offsetMillis )

overridevirtual

Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add to GMT to get local time, before taking daylight savings time into account).

Parameters

offsetMillis The new raw GMT offset for this time zone.

Stable:: ICU 2.0

Implements icu::TimeZone.

◆ setStartRule() [1/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		TimeMode	mode,
		UBool	after,
		UErrorCode &	status
	)

Sets the DST start rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	A date within that month (1-based).
dayOfWeek	The day of the week on which this rule occurs.
time	The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
after	If true, this rule selects the first dayOfWeek on or after dayOfMonth. If false, this rule selects the last dayOfWeek on or before dayOfMonth.
status	An UErrorCode

Stable:: ICU 2.0

◆ setStartRule() [2/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		UBool	after,
		UErrorCode &	status
	)

inline

Sets the DST start rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	A date within that month (1-based).
dayOfWeek	The day of the week on which this rule occurs.
time	The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
after	If true, this rule selects the first dayOfWeek on or after dayOfMonth. If false, this rule selects the last dayOfWeek on or before dayOfMonth.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 906 of file simpletz.h.

◆ setStartRule() [3/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	time,
		TimeMode	mode,
		UErrorCode &	status
	)

Sets the DST start rule to a fixed date within a month.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	The date in that month (1-based).
time	The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
status	An UErrorCode

Stable:: ICU 2.0

◆ setStartRule() [4/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfMonth,
		int32_t	time,
		UErrorCode &	status
	)

inline

Sets the DST start rule to a fixed date within a month.

Parameters

month	The month in which this rule occurs (0-based).
dayOfMonth	The date in that month (1-based).
time	The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 900 of file simpletz.h.

◆ setStartRule() [5/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfWeekInMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		TimeMode	mode,
		UErrorCode &	status
	)

Sets the daylight savings starting rule.

For example, in the U.S., Daylight Savings Time starts at the second Sunday in March, at 2 AM in standard time. Therefore, you can set the start rule by calling: setStartRule(UCAL_MARCH, 2, UCAL_SUNDAY, 2*60*60*1000); The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate the exact starting date. Their exact meaning depend on their respective signs, allowing various types of rules to be constructed, as follows:

If both dayOfWeekInMonth and dayOfWeek are positive, they specify the day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday of the month).
If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify the day of week in the month counting backward from the end of the month. (e.g., (-1, MONDAY) is the last Monday in the month)
If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth specifies the day of the month, regardless of what day of the week it is. (e.g., (10, 0) is the tenth day of the month)
If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth specifies the day of the month counting backward from the end of the month, regardless of what day of the week it is (e.g., (-2, 0) is the next-to-last day of the month).
If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the first specified day of the week on or after the specified day of the month. (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month [or the 15th itself if the 15th is a Sunday].)
If dayOfWeek and DayOfWeekInMonth are both negative, they specify the last specified day of the week on or before the specified day of the month. (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month [or the 20th itself if the 20th is a Tuesday].)

Parameters

month	the daylight savings starting month. Month is 0-based. eg, 0 for January.
dayOfWeekInMonth	the daylight savings starting day-of-week-in-month. Please see the member description for an example.
dayOfWeek	the daylight savings starting day-of-week. Please see the member description for an example.
time	the daylight savings starting time. Please see the member description for an example.
mode	whether the time is local wall time, local standard time, or UTC time. Default is local wall time.
status	An UErrorCode

Stable:: ICU 2.0

◆ setStartRule() [6/6]

void icu::SimpleTimeZone::setStartRule	(	int32_t	month,
		int32_t	dayOfWeekInMonth,
		int32_t	dayOfWeek,
		int32_t	time,
		UErrorCode &	status
	)

inline

Sets the daylight savings starting rule.

For example, in the U.S., Daylight Savings Time starts at the second Sunday in March, at 2 AM in standard time. Therefore, you can set the start rule by calling: setStartRule(UCAL_MARCH, 2, UCAL_SUNDAY, 2*60*60*1000); The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate the exact starting date. Their exact meaning depend on their respective signs, allowing various types of rules to be constructed, as follows:

If both dayOfWeekInMonth and dayOfWeek are positive, they specify the day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday of the month).
If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify the day of week in the month counting backward from the end of the month. (e.g., (-1, MONDAY) is the last Monday in the month)
If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth specifies the day of the month, regardless of what day of the week it is. (e.g., (10, 0) is the tenth day of the month)
If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth specifies the day of the month counting backward from the end of the month, regardless of what day of the week it is (e.g., (-2, 0) is the next-to-last day of the month).
If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the first specified day of the week on or after the specified day of the month. (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month [or the 15th itself if the 15th is a Sunday].)
If dayOfWeek and DayOfWeekInMonth are both negative, they specify the last specified day of the week on or before the specified day of the month. (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month [or the 20th itself if the 20th is a Tuesday].)

Parameters

month	the daylight savings starting month. Month is 0-based. eg, 0 for January.
dayOfWeekInMonth	the daylight savings starting day-of-week-in-month. Please see the member description for an example.
dayOfWeek	the daylight savings starting day-of-week. Please see the member description for an example.
time	the daylight savings starting time. Please see the member description for an example.
status	An UErrorCode

Stable:: ICU 2.0

Definition at line 894 of file simpletz.h.

◆ setStartYear()

void icu::SimpleTimeZone::setStartYear ( int32_t year )

Sets the daylight savings starting year, that is, the year this time zone began observing its specified daylight savings time rules.

The time zone is considered not to observe daylight savings time prior to that year; SimpleTimeZone doesn't support historical daylight-savings-time rules.

Parameters

year	the daylight savings starting year.

Stable:: ICU 2.0

◆ useDaylightTime()

virtual UBool icu::SimpleTimeZone::useDaylightTime ( ) const

overridevirtual

Queries if this TimeZone uses Daylight Savings Time.

Returns: True if this TimeZone uses Daylight Savings Time; false otherwise.

Stable:: ICU 2.0

Implements icu::TimeZone.

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

i18n/unicode/simpletz.h

Public Types

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ TimeMode

Constructor & Destructor Documentation

◆ SimpleTimeZone() [1/5]

◆ ~SimpleTimeZone()

◆ SimpleTimeZone() [2/5]

◆ SimpleTimeZone() [3/5]

◆ SimpleTimeZone() [4/5]

◆ SimpleTimeZone() [5/5]

Member Function Documentation

◆ clone()

◆ countTransitionRules()

◆ getDSTSavings()

◆ getDynamicClassID()

◆ getNextTransition()

◆ getOffset() [1/4]

◆ getOffset() [2/4]

◆ getOffset() [3/4]

◆ getOffset() [4/4]

◆ getOffsetFromLocal()

◆ getPreviousTransition()

◆ getRawOffset()

◆ getStaticClassID()

◆ getTimeZoneRules()

◆ hasSameRules()

◆ inDaylightTime()

◆ operator=()

◆ operator==()

◆ setDSTSavings()

◆ setEndRule() [1/6]

◆ setEndRule() [2/6]

◆ setEndRule() [3/6]

◆ setEndRule() [4/6]

◆ setEndRule() [5/6]

◆ setEndRule() [6/6]

◆ setRawOffset()

◆ setStartRule() [1/6]

◆ setStartRule() [2/6]

◆ setStartRule() [3/6]

◆ setStartRule() [4/6]

◆ setStartRule() [5/6]

◆ setStartRule() [6/6]

◆ setStartYear()

◆ useDaylightTime()