* DateFormat helps you to format and parse dates for any locale. Your code can * be completely independent of the locale conventions for months, days of the * week, or even the calendar format: lunar vs. solar. *
* To format a date for the current Locale, use one of the static factory * methods: *
* \code * DateFormat* dfmt = DateFormat::createDateInstance(); * UDate myDate = Calendar::getNow(); * UnicodeString myString; * myString = dfmt->format( myDate, myString ); * \endcode ** If you are formatting multiple numbers, it is more efficient to get the * format and use it multiple times so that the system doesn't have to fetch the * information about the local language and country conventions multiple times. *
* \code
* DateFormat* df = DateFormat::createDateInstance();
* UnicodeString myString;
* UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
* for (int32_t i = 0; i < 3; ++i) {
* myString.remove();
* cout << df->format( myDateArr[i], myString ) << endl;
* }
* \endcode
*
* To get specific fields of a date, you can use UFieldPosition to
* get specific fields.
* * \code * DateFormat* dfmt = DateFormat::createDateInstance(); * FieldPosition pos(DateFormat::YEAR_FIELD); * UnicodeString myString; * myString = dfmt->format( myDate, myString ); * cout << myString << endl; * cout << pos.getBeginIndex() << "," << pos. getEndIndex() << endl; * \endcode ** To format a date for a different Locale, specify it in the call to * createDateInstance(). *
* \code * DateFormat* df = * DateFormat::createDateInstance( DateFormat::SHORT, Locale::getFrance()); * \endcode ** You can use a DateFormat to parse also. *
* \code * UErrorCode status = U_ZERO_ERROR; * UDate myDate = df->parse(myString, status); * \endcode ** Use createDateInstance() to produce the normal date format for that country. * There are other static factory methods available. Use createTimeInstance() * to produce the normal time format for that country. Use createDateTimeInstance() * to produce a DateFormat that formats both date and time. You can pass in * different options to these factory methods to control the length of the * result; from SHORT to MEDIUM to LONG to FULL. The exact result depends on the * locale, but generally: *
* You can also use forms of the parse and format methods with ParsePosition and * FieldPosition to allow you to *
User subclasses are not supported. While clients may write * subclasses, such code will not necessarily work and will not be * guaranteed to work stably from release to release. */ class U_I18N_API DateFormat : public Format { public: /** * Constants for various style patterns. These reflect the order of items in * the DateTimePatterns resource. There are 4 time patterns, 4 date patterns, * and then the date-time pattern. Each block of 4 values in the resource occurs * in the order full, long, medium, short. * @stable ICU 2.4 */ enum EStyle { kNone = -1, kFull = 0, kLong = 1, kMedium = 2, kShort = 3, kDateOffset = kShort + 1, // kFull + kDateOffset = 4 // kLong + kDateOffset = 5 // kMedium + kDateOffset = 6 // kShort + kDateOffset = 7 kDateTime = 8, kDefault = kMedium, /** * These constants are provided for backwards compatibility only. * Please use the C++ style constants defined above. */ FULL = kFull, LONG = kLong, MEDIUM = kMedium, SHORT = kShort, DEFAULT = kDefault, DATE_OFFSET = kDateOffset, NONE = kNone, DATE_TIME = kDateTime }; /** * Destructor. * @stable ICU 2.0 */ virtual ~DateFormat(); /** * Equality operator. Returns true if the two formats have the same behavior. * @stable ICU 2.0 */ virtual UBool operator==(const Format&) const; /** * Format an object to produce a string. This method handles Formattable * objects with a UDate type. If a the Formattable object type is not a Date, * then it returns a failing UErrorCode. * * @param obj The object to format. Must be a Date. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ virtual UnicodeString& format(const Formattable& obj, UnicodeString& appendTo, FieldPosition& pos, UErrorCode& status) const; /** * Formats a date into a date/time string. This is an abstract method which * concrete subclasses must implement. *
* On input, the FieldPosition parameter may have its "field" member filled with * an enum value specifying a field. On output, the FieldPosition will be filled * in with the text offsets for that field. *
For example, given a time text * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively. *
Notice * that if the same time field appears more than once in a pattern, the status will * be set for the first occurence of that time field. For instance, * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)" * using the pattern "h a z (zzzz)" and the alignment field * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first * occurence of the timezone pattern character 'z'. * * @param cal Calendar set to the date and time to be formatted * into a date/time string. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param fieldPosition On input: an alignment field, if desired (see examples above) * On output: the offsets of the alignment field (see examples above) * @return Reference to 'appendTo' parameter. * @stable ICU 2.1 */ virtual UnicodeString& format( Calendar& cal, UnicodeString& appendTo, FieldPosition& fieldPosition) const = 0; /** * Formats a UDate into a date/time string. *
* On input, the FieldPosition parameter may have its "field" member filled with * an enum value specifying a field. On output, the FieldPosition will be filled * in with the text offsets for that field. *
For example, given a time text * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively. *
Notice * that if the same time field appears more than once in a pattern, the status will * be set for the first occurence of that time field. For instance, * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)" * using the pattern "h a z (zzzz)" and the alignment field * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first * occurence of the timezone pattern character 'z'. * * @param date UDate to be formatted into a date/time string. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param fieldPosition On input: an alignment field, if desired (see examples above) * On output: the offsets of the alignment field (see examples above) * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ UnicodeString& format( UDate date, UnicodeString& appendTo, FieldPosition& fieldPosition) const; /** * Formats a UDate into a date/time string. If there is a problem, you won't * know, using this method. Use the overloaded format() method which takes a * FieldPosition& to detect formatting problems. * * @param date The UDate value to be formatted into a string. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ UnicodeString& format(UDate date, UnicodeString& appendTo) const; /** * Redeclared Format method. * * @param obj The object to be formatted into a string. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ UnicodeString& format(const Formattable& obj, UnicodeString& appendTo, UErrorCode& status) const; /** * Parse a date/time string. * * @param text The string to be parsed into a UDate value. * @param status Output param to be set to success/failure code. If * 'text' cannot be parsed, it will be set to a failure * code. * @result The parsed UDate value, if successful. * @stable ICU 2.0 */ virtual UDate parse( const UnicodeString& text, UErrorCode& status) const; /** * Parse a date/time string beginning at the given parse position. For * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date * that is equivalent to Date(837039928046). *
* By default, parsing is lenient: If the input is not in the form used by * this object's format method but can still be parsed as a date, then the * parse succeeds. Clients may insist on strict adherence to the format by * calling setLenient(false). * * @see DateFormat::setLenient(boolean) * * @param text The date/time string to be parsed * @param cal a Calendar set to the date and time to be formatted * into a date/time string. * @param pos On input, the position at which to start parsing; on * output, the position at which parsing terminated, or the * start position if the parse failed. * @return A valid UDate if the input could be parsed. * @stable ICU 2.1 */ virtual void parse( const UnicodeString& text, Calendar& cal, ParsePosition& pos) const = 0; /** * Parse a date/time string beginning at the given parse position. For * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date * that is equivalent to Date(837039928046). *
* By default, parsing is lenient: If the input is not in the form used by * this object's format method but can still be parsed as a date, then the * parse succeeds. Clients may insist on strict adherence to the format by * calling setLenient(false). * * @see DateFormat::setLenient(boolean) * * @param text The date/time string to be parsed * @param pos On input, the position at which to start parsing; on * output, the position at which parsing terminated, or the * start position if the parse failed. * @return A valid UDate if the input could be parsed. * @stable ICU 2.0 */ UDate parse( const UnicodeString& text, ParsePosition& pos) const; /** * Parse a string to produce an object. This methods handles parsing of * date/time strings into Formattable objects with UDate types. *
* Before calling, set parse_pos.index to the offset you want to start * parsing at in the source. After calling, parse_pos.index is the end of * the text you parsed. If error occurs, index is unchanged. *
* When parsing, leading whitespace is discarded (with a successful parse), * while trailing whitespace is left as is. *
* See Format::parseObject() for more. * * @param source The string to be parsed into an object. * @param result Formattable to be set to the parse result. * If parse fails, return contents are undefined. * @param parse_pos The position to start parsing at. Upon return * this param is set to the position after the * last character successfully parsed. If the * source is not parsed successfully, this param * will remain unchanged. * @return A newly created Formattable* object, or NULL * on failure. The caller owns this and should * delete it when done. * @stable ICU 2.0 */ virtual void parseObject(const UnicodeString& source, Formattable& result, ParsePosition& parse_pos) const; /** * Create a default date/time formatter that uses the SHORT style for both * the date and the time. * * @return A date/time formatter which the caller owns. * @stable ICU 2.0 */ static DateFormat* U_EXPORT2 createInstance(void); /** * Creates a time formatter with the given formatting style for the given * locale. * * @param style The given formatting style. For example, * SHORT for "h:mm a" in the US locale. * @param aLocale The given locale. * @return A time formatter which the caller owns. * @stable ICU 2.0 */ static DateFormat* U_EXPORT2 createTimeInstance(EStyle style = kDefault, const Locale& aLocale = Locale::getDefault()); /** * Creates a date formatter with the given formatting style for the given * const locale. * * @param style The given formatting style. For example, * SHORT for "M/d/yy" in the US locale. * @param aLocale The given locale. * @return A date formatter which the caller owns. * @stable ICU 2.0 */ static DateFormat* U_EXPORT2 createDateInstance(EStyle style = kDefault, const Locale& aLocale = Locale::getDefault()); /** * Creates a date/time formatter with the given formatting styles for the * given locale. * * @param dateStyle The given formatting style for the date portion of the result. * For example, SHORT for "M/d/yy" in the US locale. * @param timeStyle The given formatting style for the time portion of the result. * For example, SHORT for "h:mm a" in the US locale. * @param aLocale The given locale. * @return A date/time formatter which the caller owns. * @stable ICU 2.0 */ static DateFormat* U_EXPORT2 createDateTimeInstance(EStyle dateStyle = kDefault, EStyle timeStyle = kDefault, const Locale& aLocale = Locale::getDefault()); /** * Gets the set of locales for which DateFormats are installed. * @param count Filled in with the number of locales in the list that is returned. * @return the set of locales for which DateFormats are installed. The caller * does NOT own this list and must not delete it. * @stable ICU 2.0 */ static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count); /** * Returns true if the formatter is set for lenient parsing. * @stable ICU 2.0 */ virtual UBool isLenient(void) const; /** * Specify whether or not date/time parsing is to be lenient. With lenient * parsing, the parser may use heuristics to interpret inputs that do not * precisely match this object's format. With strict parsing, inputs must * match this object's format. * * @param lenient True specifies date/time interpretation to be lenient. * @see Calendar::setLenient * @stable ICU 2.0 */ virtual void setLenient(UBool lenient); /** * Gets the calendar associated with this date/time formatter. * @return the calendar associated with this date/time formatter. * @stable ICU 2.0 */ virtual const Calendar* getCalendar(void) const; /** * Set the calendar to be used by this date format. Initially, the default * calendar for the specified or default locale is used. The caller should * not delete the Calendar object after it is adopted by this call. * Adopting a new calendar will change to the default symbols. * * @param calendarToAdopt Calendar object to be adopted. * @stable ICU 2.0 */ virtual void adoptCalendar(Calendar* calendarToAdopt); /** * Set the calendar to be used by this date format. Initially, the default * calendar for the specified or default locale is used. * * @param newCalendar Calendar object to be set. * @stable ICU 2.0 */ virtual void setCalendar(const Calendar& newCalendar); /** * Gets the number formatter which this date/time formatter uses to format * and parse the numeric portions of the pattern. * @return the number formatter which this date/time formatter uses. * @stable ICU 2.0 */ virtual const NumberFormat* getNumberFormat(void) const; /** * Allows you to set the number formatter. The caller should * not delete the NumberFormat object after it is adopted by this call. * @param formatToAdopt NumberFormat object to be adopted. * @stable ICU 2.0 */ virtual void adoptNumberFormat(NumberFormat* formatToAdopt); /** * Allows you to set the number formatter. * @param newNumberFormat NumberFormat object to be set. * @stable ICU 2.0 */ virtual void setNumberFormat(const NumberFormat& newNumberFormat); /** * Returns a reference to the TimeZone used by this DateFormat's calendar. * @return the time zone associated with the calendar of DateFormat. * @stable ICU 2.0 */ virtual const TimeZone& getTimeZone(void) const; /** * Sets the time zone for the calendar of this DateFormat object. The caller * no longer owns the TimeZone object and should not delete it after this call. * @param zoneToAdopt the TimeZone to be adopted. * @stable ICU 2.0 */ virtual void adoptTimeZone(TimeZone* zoneToAdopt); /** * Sets the time zone for the calendar of this DateFormat object. * @param zone the new time zone. * @stable ICU 2.0 */ virtual void setTimeZone(const TimeZone& zone); protected: /** * Default constructor. Creates a DateFormat with no Calendar or NumberFormat * associated with it. This constructor depends on the subclasses to fill in * the calendar and numberFormat fields. * @stable ICU 2.0 */ DateFormat(); /** * Copy constructor. * @stable ICU 2.0 */ DateFormat(const DateFormat&); /** * Default assignment operator. * @stable ICU 2.0 */ DateFormat& operator=(const DateFormat&); /** * The calendar that DateFormat uses to produce the time field values needed * to implement date/time formatting. Subclasses should generally initialize * this to the default calendar for the locale associated with this DateFormat. * @stable ICU 2.4 */ Calendar* fCalendar; /** * The number formatter that DateFormat uses to format numbers in dates and * times. Subclasses should generally initialize this to the default number * format for the locale associated with this DateFormat. * @stable ICU 2.4 */ NumberFormat* fNumberFormat; private: /** * Gets the date/time formatter with the given formatting styles for the * given locale. * @param dateStyle the given date formatting style. * @param timeStyle the given time formatting style. * @param inLocale the given locale. * @return a date/time formatter, or 0 on failure. */ static DateFormat* U_EXPORT2 create(EStyle timeStyle, EStyle dateStyle, const Locale&); public: /** * Field selector for FieldPosition for DateFormat fields. * @obsolete ICU 3.4 use UDateFormatField instead, since this API will be * removed in that release */ enum EField { // Obsolete; use UDateFormatField instead kEraField = UDAT_ERA_FIELD, kYearField = UDAT_YEAR_FIELD, kMonthField = UDAT_MONTH_FIELD, kDateField = UDAT_DATE_FIELD, kHourOfDay1Field = UDAT_HOUR_OF_DAY1_FIELD, kHourOfDay0Field = UDAT_HOUR_OF_DAY0_FIELD, kMinuteField = UDAT_MINUTE_FIELD, kSecondField = UDAT_SECOND_FIELD, kMillisecondField = UDAT_FRACTIONAL_SECOND_FIELD, kDayOfWeekField = UDAT_DAY_OF_WEEK_FIELD, kDayOfYearField = UDAT_DAY_OF_YEAR_FIELD, kDayOfWeekInMonthField = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD, kWeekOfYearField = UDAT_WEEK_OF_YEAR_FIELD, kWeekOfMonthField = UDAT_WEEK_OF_MONTH_FIELD, kAmPmField = UDAT_AM_PM_FIELD, kHour1Field = UDAT_HOUR1_FIELD, kHour0Field = UDAT_HOUR0_FIELD, kTimezoneField = UDAT_TIMEZONE_FIELD, kYearWOYField = UDAT_YEAR_WOY_FIELD, kDOWLocalField = UDAT_DOW_LOCAL_FIELD, kExtendedYearField = UDAT_EXTENDED_YEAR_FIELD, kJulianDayField = UDAT_JULIAN_DAY_FIELD, kMillisecondsInDayField = UDAT_MILLISECONDS_IN_DAY_FIELD, // Obsolete; use UDateFormatField instead ERA_FIELD = UDAT_ERA_FIELD, YEAR_FIELD = UDAT_YEAR_FIELD, MONTH_FIELD = UDAT_MONTH_FIELD, DATE_FIELD = UDAT_DATE_FIELD, HOUR_OF_DAY1_FIELD = UDAT_HOUR_OF_DAY1_FIELD, HOUR_OF_DAY0_FIELD = UDAT_HOUR_OF_DAY0_FIELD, MINUTE_FIELD = UDAT_MINUTE_FIELD, SECOND_FIELD = UDAT_SECOND_FIELD, MILLISECOND_FIELD = UDAT_FRACTIONAL_SECOND_FIELD, DAY_OF_WEEK_FIELD = UDAT_DAY_OF_WEEK_FIELD, DAY_OF_YEAR_FIELD = UDAT_DAY_OF_YEAR_FIELD, DAY_OF_WEEK_IN_MONTH_FIELD = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD, WEEK_OF_YEAR_FIELD = UDAT_WEEK_OF_YEAR_FIELD, WEEK_OF_MONTH_FIELD = UDAT_WEEK_OF_MONTH_FIELD, AM_PM_FIELD = UDAT_AM_PM_FIELD, HOUR1_FIELD = UDAT_HOUR1_FIELD, HOUR0_FIELD = UDAT_HOUR0_FIELD, TIMEZONE_FIELD = UDAT_TIMEZONE_FIELD }; }; inline UnicodeString& DateFormat::format(const Formattable& obj, UnicodeString& appendTo, UErrorCode& status) const { return Format::format(obj, appendTo, status); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_FORMATTING */ #endif // _DATEFMT //eof