Check in the pristine copy of ICU 4.6...

icu46/source/i18n/unicode/timezone.h

+/*************************************************************************
+* Copyright (c) 1997-2010, 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"
+
+/**
+ * \file 
+ * \brief C++ API: TimeZone object
+ */
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/uobject.h"
+#include "unicode/unistr.h"
+#include "unicode/ures.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 <code>getAvailableIDs</code> method to iterate through
+ * all the supported time zone IDs. 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 does not include
+ * daylight savings time.
+ *
+ * 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 only have one
+ * TimeZone subclass: SimpleTimeZone.)
+ * <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();
+
+    /**
+     * The GMT time zone has a raw offset of zero and does not use daylight
+     * savings time. This is a commonly used time zone.
+     * @return the GMT time zone.
+     * @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 the GMT zone if the given ID
+     * cannot be understood.  Return result guaranteed to be non-null.  If you
+     * require that the specific zone asked for be returned, check the ID of the
+     * return result.
+     * @stable ICU 2.0
+     */
+    static TimeZone* U_EXPORT2 createTimeZone(const UnicodeString& ID);
+
+    /**
+     * 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 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 system using methods in TPlatformUtilities. If the
+     * system routines fail, or if they specify a TimeZone or TimeZone offset which is not
+     * recognized, the TimeZone indicated by the ID kLastResortID is instantiated
+     * and made the default.
+     *
+     * @return   A default TimeZone. Clients are responsible for deleting the time zone
+     *           object returned.
+     * @stable ICU 2.0
+     */
+    static TimeZone* U_EXPORT2 createDefault(void);
+
+    /**
+     * 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 clent 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);
+
+    /**
+     * 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
+     */
+    static void U_EXPORT2 setDefault(const TimeZone& zone);
+
+    /**
+     * 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        Recevies 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        Recevies 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);
+
+    /**
+     * 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 format
+     * <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 format
+     * <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 format
+     * <code>GMT[+-]hh:mm</code>.
+     * @param daylight 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 daylight, 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 format
+     * <code>GMT[+-]hh:mm</code>.
+     * @param daylight 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 refence to 'result'.
+     * @stable ICU 2.0
+     */
+    UnicodeString& getDisplayName(UBool daylight, 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.
+     * @stable ICU 2.0
+     */
+    virtual UBool useDaylightTime(void) const = 0;
+
+    /**
+     * 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;
+
+    /**
+     * 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(void) 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;
+
+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);
+
+    /**
+     * 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);
+
+private:
+    friend class ZoneMeta;
+
+
+    static TimeZone*        createCustomTimeZone(const UnicodeString&); // Creates a time zone based on the string.
+
+    /**
+     * 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 UChar* dereferOlsonLink(const UnicodeString& id);
+
+    /**
+     * Returns the region code associated with the given zone.
+     * @param id zone id string
+     * @return the region associated with the given zone
+     */
+    static const UChar* getRegion(const UnicodeString& id);
+
+    /**
+     * 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& min, int32_t& sec);
+
+    /**
+     * 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 custome time zone ID for the given offset fields.
+     * @param hour offset hours
+     * @param min offset minutes
+     * @param sec offset seconds
+     * @param netative 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);
+
+    /**
+     * Responsible for setting up DEFAULT_ZONE.  Uses routines in TPlatformUtilities
+     * (i.e., platform-specific calls) to get the current system time zone.  Failing
+     * that, uses the platform-specific default time zone.  Failing that, uses GMT.
+     */
+    static void             initDefault(void);
+
+    // See source file for documentation
+    /**
+     * Lookup the given name in our system zone table.  If found,
+     * instantiate a new zone of that name and return it.  If not
+     * found, return 0.
+     * @param name tthe given name of a system time zone.
+     * @return the TimeZone indicated by the 'name'.
+     */
+    static TimeZone*        createSystemTimeZone(const UnicodeString& name);
+
+    UnicodeString           fID;    // this time zone's ID
+
+};
+
+
+// -------------------------------------
+
+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 //_TIMEZONE
+//eof