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Showing content from https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1BasicTimeZone.html below:

ICU 77.1: icu::BasicTimeZone Class Reference

virtual  ~BasicTimeZone ()   Destructor. More...
  virtual BasicTimeZone *  clone () const override=0   Clones this object polymorphically. More...
  virtual UBool  getNextTransition (UDate base, UBool inclusive, TimeZoneTransition &result) const =0   Gets the first time zone transition after the base time. More...
  virtual UBool  getPreviousTransition (UDate base, UBool inclusive, TimeZoneTransition &result) const =0   Gets the most recent time zone transition before the base time. More...
  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. More...
  virtual int32_t  countTransitionRules (UErrorCode &status) const =0   Returns the number of TimeZoneRules which represents time transitions, for this time zone, that is, all TimeZoneRules for this time zone except InitialTimeZoneRule. More...
  virtual void  getTimeZoneRules (const InitialTimeZoneRule *&initial, const TimeZoneRule *trsrules[], int32_t &trscount, UErrorCode &status) const =0   Gets the InitialTimeZoneRule and the set of TimeZoneRule which represent time transitions for this time zone. More...
  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. More...
  virtual void  getOffsetFromLocal (UDate date, UTimeZoneLocalOption nonExistingTimeOpt, UTimeZoneLocalOption duplicatedTimeOpt, int32_t &rawOffset, int32_t &dstOffset, UErrorCode &status) const   Get time zone offsets from local wall time. More...
  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. More...
  virtual  ~TimeZone ()   virtual bool  operator== (const TimeZone &that) const   Returns true if the two TimeZones are equal. More...
  bool  operator!= (const TimeZone &that) const   Returns true if the two TimeZones are NOT equal; that is, if operator==() returns false. More...
  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 =0   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. More...
  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 =0   Gets the time zone offset, for current date, modified in case of daylight savings. More...
  virtual void  getOffset (UDate date, UBool local, int32_t &rawOffset, int32_t &dstOffset, UErrorCode &ec) const   Returns the time zone raw and GMT offset for the given moment in time. More...
  virtual void  setRawOffset (int32_t offsetMillis)=0   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). More...
  virtual int32_t  getRawOffset () const =0   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). More...
  UnicodeString &  getID (UnicodeString &ID) const   Fills in "ID" with the TimeZone's ID. More...
  void  setID (const UnicodeString &ID)   Sets the TimeZone's ID to the specified value. More...
  UnicodeString &  getDisplayName (UnicodeString &result) const   Returns a name of this time zone suitable for presentation to the user in the default locale. More...
  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. More...
  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. More...
  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. More...
  virtual UBool  useDaylightTime () const =0   Queries if this time zone uses daylight savings time. More...
  virtual UBool  inDaylightTime (UDate date, UErrorCode &status) const =0   Queries if the given date is in daylight savings time in this time zone. More...
  virtual UBool  hasSameRules (const TimeZone &other) const   Returns true if this zone has the same rule and offset as another zone. More...
  virtual UClassID  getDynamicClassID () const override=0   Returns a unique class ID POLYMORPHICALLY. More...
  virtual int32_t  getDSTSavings () const   Returns the amount of time to be added to local standard time to get local wall clock time. More...
  virtual  ~UObject ()   Destructor. More...
  static const TimeZone &  getUnknown ()   Returns the "unknown" time zone. More...
  static const TimeZone *  getGMT ()   The GMT (=UTC) time zone has a raw offset of zero and does not use daylight savings time. More...
  static TimeZone *  createTimeZone (const UnicodeString &ID)   Creates a TimeZone for the given ID. More...
  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. More...
  static StringEnumeration *  createEnumeration ()   Returns an enumeration over all recognized time zone IDs. More...
  static StringEnumeration *  createEnumeration (UErrorCode &status)   Returns an enumeration over all recognized time zone IDs. More...
  static StringEnumeration *  createEnumeration (int32_t rawOffset)   Returns an enumeration over time zone IDs with a given raw offset from GMT. More...
  static StringEnumeration *  createEnumerationForRawOffset (int32_t rawOffset, UErrorCode &status)   Returns an enumeration over time zone IDs with a given raw offset from GMT. More...
  static StringEnumeration *  createEnumeration (const char *region)   Returns an enumeration over time zone IDs associated with the given region. More...
  static StringEnumeration *  createEnumerationForRegion (const char *region, UErrorCode &status)   Returns an enumeration over time zone IDs associated with the given region. More...
  static int32_t  countEquivalentIDs (const UnicodeString &id)   Returns the number of IDs in the equivalency group that includes the given ID. More...
  static UnicodeString  getEquivalentID (const UnicodeString &id, int32_t index)   Returns an ID in the equivalency group that includes the given ID. More...
  static TimeZone *  detectHostTimeZone ()   Creates an instance of TimeZone detected from the current host system configuration. More...
  static TimeZone *  createDefault ()   Creates a new copy of the default TimeZone for this host. More...
  static TimeZone *  forLocaleOrDefault (const Locale &locale)   If the locale contains the timezone keyword, creates a copy of that TimeZone. More...
  static void  adoptDefault (TimeZone *zone)   Sets the default time zone (i.e., what's returned by createDefault()) to be the specified time zone. More...
  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. More...
  static const char *  getTZDataVersion (UErrorCode &status)   Returns the timezone data version currently used by ICU. More...
  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. More...
  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. More...
  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. More...
  static UnicodeString &  getWindowsID (const UnicodeString &id, UnicodeString &winid, UErrorCode &status)   Converts a system time zone ID to an equivalent Windows time zone ID. More...
  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. More...
  static UClassID  getStaticClassID ()   Return the class ID for this class. More...
  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. More...
  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. More...
  static UResourceBundle *  loadRule (const UResourceBundle *top, const UnicodeString &ruleid, UResourceBundle *oldbundle, UErrorCode &status)   Utility function. More...
 

BasicTimeZone is an abstract class extending TimeZone.

This class provides some additional methods to access time zone transitions and rules. All ICU TimeZone concrete subclasses extend this class.

Stable:
ICU 3.8

Definition at line 38 of file basictz.h.

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

Implemented in icu::VTimeZone, icu::SimpleTimeZone, and icu::RuleBasedTimeZone.

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