| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /************************************************************************* |
| * Copyright (c) 1997-2016, International Business Machines Corporation |
| * and others. All Rights Reserved. |
| ************************************************************************** |
| * |
| * File TIMEZONE.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 04/21/97 aliu Overhauled header. |
| * 07/09/97 helena Changed createInstance to createDefault. |
| * 08/06/97 aliu Removed dependency on internal header for Hashtable. |
| * 08/10/98 stephen Changed getDisplayName() API conventions to match |
| * 08/19/98 stephen Changed createTimeZone() to never return 0 |
| * 09/02/98 stephen Sync to JDK 1.2 8/31 |
| * - Added getOffset(... monthlen ...) |
| * - Added hasSameRules() |
| * 09/15/98 stephen Added getStaticClassID |
| * 12/03/99 aliu Moved data out of static table into icudata.dll. |
| * Hashtable replaced by new static data structures. |
| * 12/14/99 aliu Made GMT public. |
| * 08/15/01 grhoten Made GMT private and added the getGMT() function |
| ************************************************************************** |
| */ |
| |
| #ifndef TIMEZONE_H |
| #define TIMEZONE_H |
| |
| #include "unicode/utypes.h" |
| |
| #if U_SHOW_CPLUSPLUS_API |
| |
| /** |
| * \file |
| * \brief C++ API: TimeZone object |
| */ |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include "unicode/uobject.h" |
| #include "unicode/unistr.h" |
| #include "unicode/ures.h" |
| #include "unicode/ucal.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| class StringEnumeration; |
| |
| /** |
| * |
| * <code>TimeZone</code> represents a time zone offset, and also figures out daylight |
| * savings. |
| * |
| * <p> |
| * Typically, you get a <code>TimeZone</code> using <code>createDefault</code> |
| * which creates a <code>TimeZone</code> based on the time zone where the program |
| * is running. For example, for a program running in Japan, <code>createDefault</code> |
| * creates a <code>TimeZone</code> object based on Japanese Standard Time. |
| * |
| * <p> |
| * You can also get a <code>TimeZone</code> using <code>createTimeZone</code> along |
| * with a time zone ID. For instance, the time zone ID for the US Pacific |
| * Time zone is "America/Los_Angeles". So, you can get a Pacific Time <code>TimeZone</code> object |
| * with: |
| * \htmlonly<blockquote>\endhtmlonly |
| * <pre> |
| * TimeZone *tz = TimeZone::createTimeZone("America/Los_Angeles"); |
| * </pre> |
| * \htmlonly</blockquote>\endhtmlonly |
| * You can use the <code>createEnumeration</code> method to iterate through |
| * all the supported time zone IDs, or the <code>getCanonicalID</code> method to check |
| * if a time zone ID is supported or not. You can then choose a |
| * supported ID to get a <code>TimeZone</code>. |
| * If the time zone you want is not represented by one of the |
| * supported IDs, then you can create a custom time zone ID with |
| * the following syntax: |
| * |
| * \htmlonly<blockquote>\endhtmlonly |
| * <pre> |
| * GMT[+|-]hh[[:]mm] |
| * </pre> |
| * \htmlonly</blockquote>\endhtmlonly |
| * |
| * For example, you might specify GMT+14:00 as a custom |
| * time zone ID. The <code>TimeZone</code> that is returned |
| * when you specify a custom time zone ID uses the specified |
| * offset from GMT(=UTC) and does not observe daylight saving |
| * time. For example, you might specify GMT+14:00 as a custom |
| * time zone ID to create a TimeZone representing 14 hours ahead |
| * of GMT (with no daylight saving time). In addition, |
| * <code>getCanonicalID</code> can also be used to |
| * normalize a custom time zone ID. |
| * |
| * TimeZone is an abstract class representing a time zone. A TimeZone is needed for |
| * Calendar to produce local time for a particular time zone. A TimeZone comprises |
| * three basic pieces of information: |
| * <ul> |
| * <li>A time zone offset; that, is the number of milliseconds to add or subtract |
| * from a time expressed in terms of GMT to convert it to the same time in that |
| * time zone (without taking daylight savings time into account).</li> |
| * <li>Logic necessary to take daylight savings time into account if daylight savings |
| * time is observed in that time zone (e.g., the days and hours on which daylight |
| * savings time begins and ends).</li> |
| * <li>An ID. This is a text string that uniquely identifies the time zone.</li> |
| * </ul> |
| * |
| * (Only the ID is actually implemented in TimeZone; subclasses of TimeZone may handle |
| * daylight savings time and GMT offset in different ways. Currently we have the following |
| * TimeZone subclasses: RuleBasedTimeZone, SimpleTimeZone, and VTimeZone.) |
| * <P> |
| * The TimeZone class contains a static list containing a TimeZone object for every |
| * combination of GMT offset and daylight-savings time rules currently in use in the |
| * world, each with a unique ID. Each ID consists of a region (usually a continent or |
| * ocean) and a city in that region, separated by a slash, (for example, US Pacific |
| * Time is "America/Los_Angeles.") Because older versions of this class used |
| * three- or four-letter abbreviations instead, there is also a table that maps the older |
| * abbreviations to the newer ones (for example, "PST" maps to "America/Los_Angeles"). |
| * Anywhere the API requires an ID, you can use either form. |
| * <P> |
| * To create a new TimeZone, you call the factory function TimeZone::createTimeZone() |
| * and pass it a time zone ID. You can use the createEnumeration() function to |
| * obtain a list of all the time zone IDs recognized by createTimeZone(). |
| * <P> |
| * You can also use TimeZone::createDefault() to create a TimeZone. This function uses |
| * platform-specific APIs to produce a TimeZone for the time zone corresponding to |
| * the client's computer's physical location. For example, if you're in Japan (assuming |
| * your machine is set up correctly), TimeZone::createDefault() will return a TimeZone |
| * for Japanese Standard Time ("Asia/Tokyo"). |
| */ |
| class U_I18N_API TimeZone : public UObject { |
| public: |
| /** |
| * @stable ICU 2.0 |
| */ |
| virtual ~TimeZone(); |
| |
| /** |
| * Returns the "unknown" time zone. |
| * It behaves like the GMT/UTC time zone but has the |
| * <code>UCAL_UNKNOWN_ZONE_ID</code> = "Etc/Unknown". |
| * createTimeZone() returns a mutable clone of this time zone if the input ID is not recognized. |
| * |
| * @return the "unknown" time zone. |
| * @see UCAL_UNKNOWN_ZONE_ID |
| * @see createTimeZone |
| * @see getGMT |
| * @stable ICU 49 |
| */ |
| static const TimeZone& U_EXPORT2 getUnknown(); |
| |
| /** |
| * The GMT (=UTC) time zone has a raw offset of zero and does not use daylight |
| * savings time. This is a commonly used time zone. |
| * |
| * <p>Note: For backward compatibility reason, the ID used by the time |
| * zone returned by this method is "GMT", although the ICU's canonical |
| * ID for the GMT time zone is "Etc/GMT". |
| * |
| * @return the GMT/UTC time zone. |
| * @see getUnknown |
| * @stable ICU 2.0 |
| */ |
| static const TimeZone* U_EXPORT2 getGMT(void); |
| |
| /** |
| * Creates a <code>TimeZone</code> for the given ID. |
| * @param ID the ID for a <code>TimeZone</code>, such as "America/Los_Angeles", |
| * or a custom ID such as "GMT-8:00". |
| * @return the specified <code>TimeZone</code>, or a mutable clone of getUnknown() |
| * if the given ID cannot be understood or if the given ID is "Etc/Unknown". |
| * The return result is guaranteed to be non-NULL. |
| * If you require that the specific zone asked for be returned, |
| * compare the result with getUnknown() or check the ID of the return result. |
| * @stable ICU 2.0 |
| */ |
| static TimeZone* U_EXPORT2 createTimeZone(const UnicodeString& ID); |
| |
| /** |
| * Returns an enumeration over system time zone IDs with the given |
| * filter conditions. |
| * @param zoneType The system time zone type. |
| * @param region The ISO 3166 two-letter country code or UN M.49 |
| * three-digit area code. When NULL, no filtering |
| * done by region. |
| * @param rawOffset An offset from GMT in milliseconds, ignoring |
| * the effect of daylight savings time, if any. |
| * When NULL, no filtering done by zone offset. |
| * @param ec Output param to filled in with a success or |
| * an error. |
| * @return an enumeration object, owned by the caller. |
| * @stable ICU 4.8 |
| */ |
| static StringEnumeration* U_EXPORT2 createTimeZoneIDEnumeration( |
| USystemTimeZoneType zoneType, |
| const char* region, |
| const int32_t* rawOffset, |
| UErrorCode& ec); |
| |
| /** |
| * Returns an enumeration over all recognized time zone IDs. (i.e., |
| * all strings that createTimeZone() accepts) |
| * |
| * @return an enumeration object, owned by the caller. |
| * @stable ICU 2.4 |
| */ |
| static StringEnumeration* U_EXPORT2 createEnumeration(); |
| |
| /** |
| * Returns an enumeration over time zone IDs with a given raw |
| * offset from GMT. There may be several times zones with the |
| * same GMT offset that differ in the way they handle daylight |
| * savings time. For example, the state of Arizona doesn't |
| * observe daylight savings time. If you ask for the time zone |
| * IDs corresponding to GMT-7:00, you'll get back an enumeration |
| * over two time zone IDs: "America/Denver," which corresponds to |
| * Mountain Standard Time in the winter and Mountain Daylight Time |
| * in the summer, and "America/Phoenix", which corresponds to |
| * Mountain Standard Time year-round, even in the summer. |
| * |
| * @param rawOffset an offset from GMT in milliseconds, ignoring |
| * the effect of daylight savings time, if any |
| * @return an enumeration object, owned by the caller |
| * @stable ICU 2.4 |
| */ |
| static StringEnumeration* U_EXPORT2 createEnumeration(int32_t rawOffset); |
| |
| /** |
| * Returns an enumeration over time zone IDs associated with the |
| * given country. Some zones are affiliated with no country |
| * (e.g., "UTC"); these may also be retrieved, as a group. |
| * |
| * @param country The ISO 3166 two-letter country code, or NULL to |
| * retrieve zones not affiliated with any country. |
| * @return an enumeration object, owned by the caller |
| * @stable ICU 2.4 |
| */ |
| static StringEnumeration* U_EXPORT2 createEnumeration(const char* country); |
| |
| /** |
| * Returns the number of IDs in the equivalency group that |
| * includes the given ID. An equivalency group contains zones |
| * that have the same GMT offset and rules. |
| * |
| * <p>The returned count includes the given ID; it is always >= 1. |
| * The given ID must be a system time zone. If it is not, returns |
| * zero. |
| * @param id a system time zone ID |
| * @return the number of zones in the equivalency group containing |
| * 'id', or zero if 'id' is not a valid system ID |
| * @see #getEquivalentID |
| * @stable ICU 2.0 |
| */ |
| static int32_t U_EXPORT2 countEquivalentIDs(const UnicodeString& id); |
| |
| /** |
| * Returns an ID in the equivalency group that |
| * includes the given ID. An equivalency group contains zones |
| * that have the same GMT offset and rules. |
| * |
| * <p>The given index must be in the range 0..n-1, where n is the |
| * value returned by <code>countEquivalentIDs(id)</code>. For |
| * some value of 'index', the returned value will be equal to the |
| * given id. If the given id is not a valid system time zone, or |
| * if 'index' is out of range, then returns an empty string. |
| * @param id a system time zone ID |
| * @param index a value from 0 to n-1, where n is the value |
| * returned by <code>countEquivalentIDs(id)</code> |
| * @return the ID of the index-th zone in the equivalency group |
| * containing 'id', or an empty string if 'id' is not a valid |
| * system ID or 'index' is out of range |
| * @see #countEquivalentIDs |
| * @stable ICU 2.0 |
| */ |
| static const UnicodeString U_EXPORT2 getEquivalentID(const UnicodeString& id, |
| int32_t index); |
| |
| /** |
| * Creates an instance of TimeZone detected from the current host |
| * system configuration. If the host system detection routines fail, |
| * or if they specify a TimeZone or TimeZone offset which is not |
| * recognized, then the special TimeZone "Etc/Unknown" is returned. |
| * |
| * Note that ICU4C does not change the default time zone unless |
| * `TimeZone::adoptDefault(TimeZone*)` or |
| * `TimeZone::setDefault(const TimeZone&)` is explicitly called by a |
| * user. This method does not update the current ICU's default, |
| * and may return a different TimeZone from the one returned by |
| * `TimeZone::createDefault()`. |
| * |
| * <p>This function is not thread safe.</p> |
| * |
| * @return A new instance of TimeZone detected from the current host system |
| * configuration. |
| * @see adoptDefault |
| * @see setDefault |
| * @see createDefault |
| * @see getUnknown |
| * @stable ICU 55 |
| */ |
| static TimeZone* U_EXPORT2 detectHostTimeZone(); |
| |
| /** |
| * Creates a new copy of the default TimeZone for this host. Unless the default time |
| * zone has already been set using adoptDefault() or setDefault(), the default is |
| * determined by querying the host system configuration. If the host system detection |
| * routines fail, or if they specify a TimeZone or TimeZone offset which is not |
| * recognized, then the special TimeZone "Etc/Unknown" is instantiated and made the |
| * default. |
| * |
| * @return A default TimeZone. Clients are responsible for deleting the time zone |
| * object returned. |
| * @see getUnknown |
| * @stable ICU 2.0 |
| */ |
| static TimeZone* U_EXPORT2 createDefault(void); |
| |
| #ifndef U_HIDE_INTERNAL_API |
| /** |
| * If the locale contains the timezone keyword, creates a copy of that TimeZone. |
| * Otherwise, create the default timezone. |
| * |
| * @param locale a locale which may contains 'timezone' keyword/value. |
| * @return A TimeZone. Clients are responsible for deleting the time zone |
| * object returned. |
| * @internal |
| */ |
| static TimeZone* U_EXPORT2 forLocaleOrDefault(const Locale& locale); |
| #endif /* U_HIDE_INTERNAL_API */ |
| |
| /** |
| * Sets the default time zone (i.e., what's returned by createDefault()) to be the |
| * specified time zone. If NULL is specified for the time zone, the default time |
| * zone is set to the default host time zone. This call adopts the TimeZone object |
| * passed in; the client is no longer responsible for deleting it. |
| * |
| * @param zone A pointer to the new TimeZone object to use as the default. |
| * @stable ICU 2.0 |
| */ |
| static void U_EXPORT2 adoptDefault(TimeZone* zone); |
| |
| #ifndef U_HIDE_SYSTEM_API |
| /** |
| * Same as adoptDefault(), except that the TimeZone object passed in is NOT adopted; |
| * the caller remains responsible for deleting it. |
| * |
| * @param zone The given timezone. |
| * @system |
| * @stable ICU 2.0 |
| */ |
| static void U_EXPORT2 setDefault(const TimeZone& zone); |
| #endif /* U_HIDE_SYSTEM_API */ |
| |
| /** |
| * Returns the timezone data version currently used by ICU. |
| * @param status Output param to filled in with a success or an error. |
| * @return the version string, such as "2007f" |
| * @stable ICU 3.8 |
| */ |
| static const char* U_EXPORT2 getTZDataVersion(UErrorCode& status); |
| |
| /** |
| * Returns the canonical system timezone ID or the normalized |
| * custom time zone ID for the given time zone ID. |
| * @param id The input time zone ID to be canonicalized. |
| * @param canonicalID Receives the canonical system time zone ID |
| * or the custom time zone ID in normalized format. |
| * @param status Receives the status. When the given time zone ID |
| * is neither a known system time zone ID nor a |
| * valid custom time zone ID, U_ILLEGAL_ARGUMENT_ERROR |
| * is set. |
| * @return A reference to the result. |
| * @stable ICU 4.0 |
| */ |
| static UnicodeString& U_EXPORT2 getCanonicalID(const UnicodeString& id, |
| UnicodeString& canonicalID, UErrorCode& status); |
| |
| /** |
| * Returns the canonical system time zone ID or the normalized |
| * custom time zone ID for the given time zone ID. |
| * @param id The input time zone ID to be canonicalized. |
| * @param canonicalID Receives the canonical system time zone ID |
| * or the custom time zone ID in normalized format. |
| * @param isSystemID Receives if the given ID is a known system |
| * time zone ID. |
| * @param status Receives the status. When the given time zone ID |
| * is neither a known system time zone ID nor a |
| * valid custom time zone ID, U_ILLEGAL_ARGUMENT_ERROR |
| * is set. |
| * @return A reference to the result. |
| * @stable ICU 4.0 |
| */ |
| static UnicodeString& U_EXPORT2 getCanonicalID(const UnicodeString& id, |
| UnicodeString& canonicalID, UBool& isSystemID, UErrorCode& status); |
| |
| /** |
| * Converts a system time zone ID to an equivalent Windows time zone ID. For example, |
| * Windows time zone ID "Pacific Standard Time" is returned for input "America/Los_Angeles". |
| * |
| * <p>There are system time zones that cannot be mapped to Windows zones. When the input |
| * system time zone ID is unknown or unmappable to a Windows time zone, then the result will be |
| * empty, but the operation itself remains successful (no error status set on return). |
| * |
| * <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html"> |
| * Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes, |
| * please read the ICU user guide section <a href="https://unicode-org.github.io/icu/userguide/datetime/timezone#updating-the-time-zone-data"> |
| * Updating the Time Zone Data</a>. |
| * |
| * @param id A system time zone ID. |
| * @param winid Receives a Windows time zone ID. When the input system time zone ID is unknown |
| * or unmappable to a Windows time zone ID, then an empty string is set on return. |
| * @param status Receives the status. |
| * @return A reference to the result (<code>winid</code>). |
| * @see getIDForWindowsID |
| * |
| * @stable ICU 52 |
| */ |
| static UnicodeString& U_EXPORT2 getWindowsID(const UnicodeString& id, |
| UnicodeString& winid, UErrorCode& status); |
| |
| /** |
| * Converts a Windows time zone ID to an equivalent system time zone ID |
| * for a region. For example, system time zone ID "America/Los_Angeles" is returned |
| * for input Windows ID "Pacific Standard Time" and region "US" (or <code>null</code>), |
| * "America/Vancouver" is returned for the same Windows ID "Pacific Standard Time" and |
| * region "CA". |
| * |
| * <p>Not all Windows time zones can be mapped to system time zones. When the input |
| * Windows time zone ID is unknown or unmappable to a system time zone, then the result |
| * will be empty, but the operation itself remains successful (no error status set on return). |
| * |
| * <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html"> |
| * Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes, |
| * please read the ICU user guide section <a href="https://unicode-org.github.io/icu/userguide/datetime/timezone#updating-the-time-zone-data"> |
| * Updating the Time Zone Data</a>. |
| * |
| * @param winid A Windows time zone ID. |
| * @param region A null-terminated region code, or <code>NULL</code> if no regional preference. |
| * @param id Receives a system time zone ID. When the input Windows time zone ID is unknown |
| * or unmappable to a system time zone ID, then an empty string is set on return. |
| * @param status Receives the status. |
| * @return A reference to the result (<code>id</code>). |
| * @see getWindowsID |
| * |
| * @stable ICU 52 |
| */ |
| static UnicodeString& U_EXPORT2 getIDForWindowsID(const UnicodeString& winid, const char* region, |
| UnicodeString& id, UErrorCode& status); |
| |
| /** |
| * Returns true if the two TimeZones are equal. (The TimeZone version only compares |
| * IDs, but subclasses are expected to also compare the fields they add.) |
| * |
| * @param that The TimeZone object to be compared with. |
| * @return True if the given TimeZone is equal to this TimeZone; false |
| * otherwise. |
| * @stable ICU 2.0 |
| */ |
| virtual UBool operator==(const TimeZone& that) const; |
| |
| /** |
| * Returns true if the two TimeZones are NOT equal; that is, if operator==() returns |
| * false. |
| * |
| * @param that The TimeZone object to be compared with. |
| * @return True if the given TimeZone is not equal to this TimeZone; false |
| * otherwise. |
| * @stable ICU 2.0 |
| */ |
| UBool operator!=(const TimeZone& that) const {return !operator==(that);} |
| |
| /** |
| * 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 local standard time. |
| * |
| * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, |
| * which returns both the raw and the DST offset for a given time. This method |
| * is retained only for backward compatibility. |
| * |
| * @param era The reference date's era |
| * @param year The reference date's year |
| * @param month The reference date's month (0-based; 0 is January) |
| * @param day The reference date's day-in-month (1-based) |
| * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) |
| * @param millis The reference date's milliseconds in day, local standard time |
| * @param status Output param to filled in with a success or an error. |
| * @return The offset in milliseconds to add to GMT to get local time. |
| * @stable ICU 2.0 |
| */ |
| 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; |
| |
| /** |
| * 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. |
| * |
| * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, |
| * which returns both the raw and the DST offset for a given time. This method |
| * is retained only for backward compatibility. |
| * |
| * @param era the era of the given date. |
| * @param year the year in the given date. |
| * @param month the month in the given date. |
| * Month is 0-based. e.g., 0 for January. |
| * @param day the day-in-month of the given date. |
| * @param dayOfWeek the day-of-week of the given date. |
| * @param milliseconds the millis in day in <em>standard</em> local time. |
| * @param monthLength the length of the given month in days. |
| * @param status Output param to filled in with a success or an error. |
| * @return the offset to add *to* GMT to get local time. |
| * @stable ICU 2.0 |
| */ |
| 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; |
| |
| /** |
| * Returns the time zone raw and GMT offset for the given moment |
| * in time. Upon return, local-millis = GMT-millis + rawOffset + |
| * dstOffset. All computations are performed in the proleptic |
| * Gregorian calendar. The default implementation in the TimeZone |
| * class delegates to the 8-argument getOffset(). |
| * |
| * @param date moment in time for which to return offsets, in |
| * units of milliseconds from January 1, 1970 0:00 GMT, either GMT |
| * time or local wall time, depending on `local'. |
| * @param local if true, `date' is local wall time; otherwise it |
| * is in GMT time. |
| * @param rawOffset output parameter to receive the raw offset, that |
| * is, the offset not including DST adjustments |
| * @param dstOffset output parameter to receive the DST offset, |
| * that is, the offset to be added to `rawOffset' to obtain the |
| * total offset between local and GMT time. If DST is not in |
| * effect, this value is zero; otherwise it is a positive value, |
| * typically one hour. |
| * @param ec input-output error code |
| * |
| * @stable ICU 2.8 |
| */ |
| virtual void getOffset(UDate date, UBool local, int32_t& rawOffset, |
| int32_t& dstOffset, UErrorCode& ec) const; |
| |
| /** |
| * 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). |
| * |
| * @param offsetMillis The new raw GMT offset for this time zone. |
| * @stable ICU 2.0 |
| */ |
| virtual void setRawOffset(int32_t offsetMillis) = 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). |
| * |
| * @return The TimeZone's raw GMT offset. |
| * @stable ICU 2.0 |
| */ |
| virtual int32_t getRawOffset(void) const = 0; |
| |
| /** |
| * Fills in "ID" with the TimeZone's ID. |
| * |
| * @param ID Receives this TimeZone's ID. |
| * @return A reference to 'ID' |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& getID(UnicodeString& ID) const; |
| |
| /** |
| * Sets the TimeZone's ID to the specified value. This doesn't affect any other |
| * fields (for example, if you say< |
| * blockquote><pre> |
| * . TimeZone* foo = TimeZone::createTimeZone("America/New_York"); |
| * . foo.setID("America/Los_Angeles"); |
| * </pre>\htmlonly</blockquote>\endhtmlonly |
| * the time zone's GMT offset and daylight-savings rules don't change to those for |
| * Los Angeles. They're still those for New York. Only the ID has changed.) |
| * |
| * @param ID The new time zone ID. |
| * @stable ICU 2.0 |
| */ |
| void setID(const UnicodeString& ID); |
| |
| /** |
| * Enum for use with getDisplayName |
| * @stable ICU 2.4 |
| */ |
| enum EDisplayType { |
| /** |
| * Selector for short display name |
| * @stable ICU 2.4 |
| */ |
| SHORT = 1, |
| /** |
| * Selector for long display name |
| * @stable ICU 2.4 |
| */ |
| LONG, |
| /** |
| * Selector for short generic display name |
| * @stable ICU 4.4 |
| */ |
| SHORT_GENERIC, |
| /** |
| * Selector for long generic display name |
| * @stable ICU 4.4 |
| */ |
| LONG_GENERIC, |
| /** |
| * Selector for short display name derived |
| * from time zone offset |
| * @stable ICU 4.4 |
| */ |
| SHORT_GMT, |
| /** |
| * Selector for long display name derived |
| * from time zone offset |
| * @stable ICU 4.4 |
| */ |
| LONG_GMT, |
| /** |
| * Selector for short display name derived |
| * from the time zone's fallback name |
| * @stable ICU 4.4 |
| */ |
| SHORT_COMMONLY_USED, |
| /** |
| * Selector for long display name derived |
| * from the time zone's fallback name |
| * @stable ICU 4.4 |
| */ |
| GENERIC_LOCATION |
| }; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the default locale. |
| * This method returns the long name, not including daylight savings. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the localized GMT offset format |
| * such as <code>GMT[+-]HH:mm</code>. |
| * @param result the human-readable name of this time zone in the default locale. |
| * @return A reference to 'result'. |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& getDisplayName(UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the specified locale. |
| * This method returns the long name, not including daylight savings. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the localized GMT offset format |
| * such as <code>GMT[+-]HH:mm</code>. |
| * @param locale the locale in which to supply the display name. |
| * @param result the human-readable name of this time zone in the given locale |
| * or in the default locale if the given locale is not recognized. |
| * @return A reference to 'result'. |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& getDisplayName(const Locale& locale, UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the default locale. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the localized GMT offset format |
| * such as <code>GMT[+-]HH:mm</code>. |
| * @param inDaylight if true, return the daylight savings name. |
| * @param style |
| * @param result the human-readable name of this time zone in the default locale. |
| * @return A reference to 'result'. |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& getDisplayName(UBool inDaylight, EDisplayType style, UnicodeString& result) const; |
| |
| /** |
| * Returns a name of this time zone suitable for presentation to the user |
| * in the specified locale. |
| * If the display name is not available for the locale, |
| * then this method returns a string in the localized GMT offset format |
| * such as <code>GMT[+-]HH:mm</code>. |
| * @param inDaylight if true, return the daylight savings name. |
| * @param style |
| * @param locale the locale in which to supply the display name. |
| * @param result the human-readable name of this time zone in the given locale |
| * or in the default locale if the given locale is not recognized. |
| * @return A reference to 'result'. |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& getDisplayName(UBool inDaylight, EDisplayType style, const Locale& locale, UnicodeString& result) const; |
| |
| /** |
| * Queries if this time zone uses daylight savings time. |
| * @return true if this time zone uses daylight savings time, |
| * false, otherwise. |
| * <p><strong>Note:</strong>The default implementation of |
| * ICU TimeZone uses the tz database, which supports historic |
| * rule changes, for system time zones. With the implementation, |
| * there are time zones that used daylight savings time in the |
| * past, but no longer used currently. For example, Asia/Tokyo has |
| * never used daylight savings time since 1951. Most clients would |
| * expect that this method to return <code>false</code> for such case. |
| * The default implementation of this method returns <code>true</code> |
| * when the time zone uses daylight savings time in the current |
| * (Gregorian) calendar year. |
| * <p>In Java 7, <code>observesDaylightTime()</code> was added in |
| * addition to <code>useDaylightTime()</code>. In Java, <code>useDaylightTime()</code> |
| * only checks if daylight saving time is observed by the last known |
| * rule. This specification might not be what most users would expect |
| * if daylight saving time is currently observed, but not scheduled |
| * in future. In this case, Java's <code>userDaylightTime()</code> returns |
| * <code>false</code>. To resolve the issue, Java 7 added <code>observesDaylightTime()</code>, |
| * which takes the current rule into account. The method <code>observesDaylightTime()</code> |
| * was added in ICU4J for supporting API signature compatibility with JDK. |
| * In general, ICU4C also provides JDK compatible methods, but the current |
| * implementation <code>userDaylightTime()</code> serves the purpose |
| * (takes the current rule into account), <code>observesDaylightTime()</code> |
| * is not added in ICU4C. In addition to <code>useDaylightTime()</code>, ICU4C |
| * <code>BasicTimeZone</code> class (Note that <code>TimeZone::createTimeZone(const UnicodeString &ID)</code> |
| * always returns a <code>BasicTimeZone</code>) provides a series of methods allowing |
| * historic and future time zone rule iteration, so you can check if daylight saving |
| * time is observed or not within a given period. |
| * |
| * @stable ICU 2.0 |
| */ |
| virtual UBool useDaylightTime(void) const = 0; |
| |
| #ifndef U_FORCE_HIDE_DEPRECATED_API |
| /** |
| * Queries if the given date is in daylight savings time in |
| * this time zone. |
| * 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. |
| * |
| * @param date the given UDate. |
| * @param status Output param filled in with success/error code. |
| * @return true if the given date is in daylight savings time, |
| * false, otherwise. |
| * @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead. |
| */ |
| virtual UBool inDaylightTime(UDate date, UErrorCode& status) const = 0; |
| #endif // U_FORCE_HIDE_DEPRECATED_API |
| |
| /** |
| * Returns true if this zone has the same rule and offset as another zone. |
| * That is, if this zone differs only in ID, if at all. |
| * @param other the <code>TimeZone</code> object to be compared with |
| * @return true if the given zone is the same as this one, |
| * with the possible exception of the ID |
| * @stable ICU 2.0 |
| */ |
| virtual UBool hasSameRules(const TimeZone& other) const; |
| |
| /** |
| * Clones TimeZone objects polymorphically. Clients are responsible for deleting |
| * the TimeZone object cloned. |
| * |
| * @return A new copy of this TimeZone object. |
| * @stable ICU 2.0 |
| */ |
| virtual TimeZone* clone() const = 0; |
| |
| /** |
| * Return the class ID for this class. This is useful only for |
| * comparing to a return value from getDynamicClassID(). |
| * @return The class ID for all objects of this class. |
| * @stable ICU 2.0 |
| */ |
| static UClassID U_EXPORT2 getStaticClassID(void); |
| |
| /** |
| * Returns a unique class ID POLYMORPHICALLY. 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. |
| * <P> |
| * Concrete subclasses of TimeZone must use the UOBJECT_DEFINE_RTTI_IMPLEMENTATION |
| * macro from uobject.h in their implementation to provide correct RTTI information. |
| * @return 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 |
| */ |
| virtual UClassID getDynamicClassID(void) const = 0; |
| |
| /** |
| * Returns the amount of time to be added to local standard time |
| * to get local wall clock time. |
| * <p> |
| * The default implementation always returns 3600000 milliseconds |
| * (i.e., one hour) if this time zone observes Daylight Saving |
| * Time. Otherwise, 0 (zero) is returned. |
| * <p> |
| * If an underlying TimeZone implementation subclass supports |
| * historical Daylight Saving Time changes, this method returns |
| * the known latest daylight saving value. |
| * |
| * @return the amount of saving time in milliseconds |
| * @stable ICU 3.6 |
| */ |
| virtual int32_t getDSTSavings() const; |
| |
| /** |
| * Gets the region code associated with the given |
| * system time zone ID. The region code is either ISO 3166 |
| * 2-letter country code or UN M.49 3-digit area code. |
| * When the time zone is not associated with a specific location, |
| * for example - "Etc/UTC", "EST5EDT", then this method returns |
| * "001" (UN M.49 area code for World). |
| * |
| * @param id The system time zone ID. |
| * @param region Output buffer for receiving the region code. |
| * @param capacity The size of the output buffer. |
| * @param status Receives the status. When the given time zone ID |
| * is not a known system time zone ID, |
| * U_ILLEGAL_ARGUMENT_ERROR is set. |
| * @return The length of the output region code. |
| * @stable ICU 4.8 |
| */ |
| static int32_t U_EXPORT2 getRegion(const UnicodeString& id, |
| char *region, int32_t capacity, UErrorCode& status); |
| |
| protected: |
| |
| /** |
| * Default constructor. ID is initialized to the empty string. |
| * @stable ICU 2.0 |
| */ |
| TimeZone(); |
| |
| /** |
| * Construct a TimeZone with a given ID. |
| * @param id a system time zone ID |
| * @stable ICU 2.0 |
| */ |
| TimeZone(const UnicodeString &id); |
| |
| /** |
| * Copy constructor. |
| * @param source the object to be copied. |
| * @stable ICU 2.0 |
| */ |
| TimeZone(const TimeZone& source); |
| |
| /** |
| * Default assignment operator. |
| * @param right the object to be copied. |
| * @stable ICU 2.0 |
| */ |
| TimeZone& operator=(const TimeZone& right); |
| |
| #ifndef U_HIDE_INTERNAL_API |
| /** |
| * Utility function. For internally loading rule data. |
| * @param top Top resource bundle for tz data |
| * @param ruleid ID of rule to load |
| * @param oldbundle Old bundle to reuse or NULL |
| * @param status Status parameter |
| * @return either a new bundle or *oldbundle |
| * @internal |
| */ |
| static UResourceBundle* loadRule(const UResourceBundle* top, const UnicodeString& ruleid, UResourceBundle* oldbundle, UErrorCode&status); |
| #endif /* U_HIDE_INTERNAL_API */ |
| |
| private: |
| friend class ZoneMeta; |
| |
| |
| static TimeZone* createCustomTimeZone(const UnicodeString&); // Creates a time zone based on the string. |
| |
| /** |
| * Finds the given ID in the Olson tzdata. If the given ID is found in the tzdata, |
| * returns the pointer to the ID resource. This method is exposed through ZoneMeta class |
| * for ICU internal implementation and useful for building hashtable using a time zone |
| * ID as a key. |
| * @param id zone id string |
| * @return the pointer of the ID resource, or NULL. |
| */ |
| static const char16_t* findID(const UnicodeString& id); |
| |
| /** |
| * Resolve a link in Olson tzdata. When the given id is known and it's not a link, |
| * the id itself is returned. When the given id is known and it is a link, then |
| * dereferenced zone id is returned. When the given id is unknown, then it returns |
| * NULL. |
| * @param id zone id string |
| * @return the dereferenced zone or NULL |
| */ |
| static const char16_t* dereferOlsonLink(const UnicodeString& id); |
| |
| /** |
| * Returns the region code associated with the given zone, |
| * or NULL if the zone is not known. |
| * @param id zone id string |
| * @return the region associated with the given zone |
| */ |
| static const char16_t* getRegion(const UnicodeString& id); |
| |
| public: |
| #ifndef U_HIDE_INTERNAL_API |
| /** |
| * Returns the region code associated with the given zone, |
| * or NULL if the zone is not known. |
| * @param id zone id string |
| * @param status Status parameter |
| * @return the region associated with the given zone |
| * @internal |
| */ |
| static const char16_t* getRegion(const UnicodeString& id, UErrorCode& status); |
| #endif /* U_HIDE_INTERNAL_API */ |
| |
| private: |
| /** |
| * Parses the given custom time zone identifier |
| * @param id id A string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or |
| * GMT[+-]hh. |
| * @param sign Receves parsed sign, 1 for positive, -1 for negative. |
| * @param hour Receives parsed hour field |
| * @param minute Receives parsed minute field |
| * @param second Receives parsed second field |
| * @return Returns true when the given custom id is valid. |
| */ |
| static UBool parseCustomID(const UnicodeString& id, int32_t& sign, int32_t& hour, |
| int32_t& minute, int32_t& second); |
| |
| /** |
| * Parse a custom time zone identifier and return the normalized |
| * custom time zone identifier for the given custom id string. |
| * @param id a string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or |
| * GMT[+-]hh. |
| * @param normalized Receives the normalized custom ID |
| * @param status Receives the status. When the input ID string is invalid, |
| * U_ILLEGAL_ARGUMENT_ERROR is set. |
| * @return The normalized custom id string. |
| */ |
| static UnicodeString& getCustomID(const UnicodeString& id, UnicodeString& normalized, |
| UErrorCode& status); |
| |
| /** |
| * Returns the normalized custom time zone ID for the given offset fields. |
| * @param hour offset hours |
| * @param min offset minutes |
| * @param sec offset seconds |
| * @param negative sign of the offset, true for negative offset. |
| * @param id Receves the format result (normalized custom ID) |
| * @return The reference to id |
| */ |
| static UnicodeString& formatCustomID(int32_t hour, int32_t min, int32_t sec, |
| UBool negative, UnicodeString& id); |
| |
| UnicodeString fID; // this time zone's ID |
| |
| friend class TZEnumeration; |
| }; |
| |
| |
| // ------------------------------------- |
| |
| inline UnicodeString& |
| TimeZone::getID(UnicodeString& ID) const |
| { |
| ID = fID; |
| return ID; |
| } |
| |
| // ------------------------------------- |
| |
| inline void |
| TimeZone::setID(const UnicodeString& ID) |
| { |
| fID = ID; |
| } |
| U_NAMESPACE_END |
| |
| #endif /* #if !UCONFIG_NO_FORMATTING */ |
| |
| #endif /* U_SHOW_CPLUSPLUS_API */ |
| |
| #endif //_TIMEZONE |
| //eof |
