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+// Copyright (C) 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 DATEFMT.H
+ *
+ * Modification History:
+ *
+ * Date Name Description
+ * 02/19/97 aliu Converted from java.
+ * 04/01/97 aliu Added support for centuries.
+ * 07/23/98 stephen JDK 1.2 sync
+ * 11/15/99 weiv Added support for week of year/day of week formatting
+ ********************************************************************************
+ */
+
+#ifndef DATEFMT_H
+#define DATEFMT_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/udat.h"
+#include "unicode/calendar.h"
+#include "unicode/numfmt.h"
+#include "unicode/format.h"
+#include "unicode/locid.h"
+#include "unicode/enumset.h"
+#include "unicode/udisplaycontext.h"
+
+/**
+ * \file
+ * \brief C++ API: Abstract class for converting dates.
+ */
+
+U_NAMESPACE_BEGIN
+
+class TimeZone;
+class DateTimePatternGenerator;
+
+// explicit template instantiation. see digitlst.h
+#if defined (_MSC_VER)
+template class U_I18N_API EnumSet<UDateFormatBooleanAttribute,
+ 0,
+ UDAT_BOOLEAN_ATTRIBUTE_COUNT>;
+#endif
+
+/**
+ * DateFormat is an abstract class for a family of classes that convert dates and
+ * times from their internal representations to textual form and back again in a
+ * language-independent manner. Converting from the internal representation (milliseconds
+ * since midnight, January 1, 1970) to text is known as "formatting," and converting
+ * from text to millis is known as "parsing." We currently define only one concrete
+ * subclass of DateFormat: SimpleDateFormat, which can handle pretty much all normal
+ * date formatting and parsing actions.
+ * <P>
+ * 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.
+ * <P>
+ * To format a date for the current Locale, use one of the static factory
+ * methods:
+ * <pre>
+ * \code
+ * DateFormat* dfmt = DateFormat::createDateInstance();
+ * UDate myDate = Calendar::getNow();
+ * UnicodeString myString;
+ * myString = dfmt->format( myDate, myString );
+ * \endcode
+ * </pre>
+ * 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.
+ * <pre>
+ * \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
+ * </pre>
+ * To get specific fields of a date, you can use UFieldPosition to
+ * get specific fields.
+ * <pre>
+ * \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
+ * </pre>
+ * To format a date for a different Locale, specify it in the call to
+ * createDateInstance().
+ * <pre>
+ * \code
+ * DateFormat* df =
+ * DateFormat::createDateInstance( DateFormat::SHORT, Locale::getFrance());
+ * \endcode
+ * </pre>
+ * You can use a DateFormat to parse also.
+ * <pre>
+ * \code
+ * UErrorCode status = U_ZERO_ERROR;
+ * UDate myDate = df->parse(myString, status);
+ * \endcode
+ * </pre>
+ * 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:
+ * <ul type=round>
+ * <li> SHORT is completely numeric, such as 12/13/52 or 3:30pm
+ * <li> MEDIUM is longer, such as Jan 12, 1952
+ * <li> LONG is longer, such as January 12, 1952 or 3:30:32pm
+ * <li> FULL is pretty completely specified, such as
+ * Tuesday, April 12, 1952 AD or 3:30:42pm PST.
+ * </ul>
+ * You can also set the time zone on the format if you wish. If you want even
+ * more control over the format or parsing, (or want to give your users more
+ * control), you can try casting the DateFormat you get from the factory methods
+ * to a SimpleDateFormat. This will work for the majority of countries; just
+ * remember to chck getDynamicClassID() before carrying out the cast.
+ * <P>
+ * You can also use forms of the parse and format methods with ParsePosition and
+ * FieldPosition to allow you to
+ * <ul type=round>
+ * <li> Progressively parse through pieces of a string.
+ * <li> Align any particular field, or find out where it is for selection
+ * on the screen.
+ * </ul>
+ *
+ * <p><em>User subclasses are not supported.</em> 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,
+ * the default date-time pattern, and 4 date-time patterns. 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,
+ // Default DateTime
+
+ kDateTimeOffset = kDateTime + 1,
+ // kFull + kDateTimeOffset = 9
+ // kLong + kDateTimeOffset = 10
+ // kMedium + kDateTimeOffset = 11
+ // kShort + kDateTimeOffset = 12
+
+ // relative dates
+ kRelative = (1 << 7),
+
+ kFullRelative = (kFull | kRelative),
+
+ kLongRelative = kLong | kRelative,
+
+ kMediumRelative = kMedium | kRelative,
+
+ kShortRelative = kShort | kRelative,
+
+
+ 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;
+
+
+ using Format::format;
+
+ /**
+ * 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;
+
+ /**
+ * 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 posIter On return, can be used to iterate over positions
+ * of fields generated by this format call. Field values
+ * are defined in UDateFormatField. Can be NULL.
+ * @param status Output param filled with success/failure status.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 4.4
+ */
+ virtual UnicodeString& format(const Formattable& obj,
+ UnicodeString& appendTo,
+ FieldPositionIterator* posIter,
+ UErrorCode& status) const;
+ /**
+ * Formats a date into a date/time string. This is an abstract method which
+ * concrete subclasses must implement.
+ * <P>
+ * 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.
+ * <P> 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.
+ * <P> 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. When the calendar type is
+ * different from the internal calendar held by this
+ * DateFormat instance, the date and the time zone will
+ * be inherited from the input calendar, but other calendar
+ * field values will be calculated by the internal calendar.
+ * @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 date into a date/time string. Subclasses should implement this method.
+ *
+ * @param cal Calendar set to the date and time to be formatted
+ * into a date/time string. When the calendar type is
+ * different from the internal calendar held by this
+ * DateFormat instance, the date and the time zone will
+ * be inherited from the input calendar, but other calendar
+ * field values will be calculated by the internal calendar.
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param posIter On return, can be used to iterate over positions
+ * of fields generated by this format call. Field values
+ * are defined in UDateFormatField. Can be NULL.
+ * @param status error status.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 4.4
+ */
+ virtual UnicodeString& format(Calendar& cal,
+ UnicodeString& appendTo,
+ FieldPositionIterator* posIter,
+ UErrorCode& status) const;
+ /**
+ * Formats a UDate into a date/time string.
+ * <P>
+ * 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.
+ * <P> 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.
+ * <P> 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.
+ *
+ * @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 posIter On return, can be used to iterate over positions
+ * of fields generated by this format call. Field values
+ * are defined in UDateFormatField. Can be NULL.
+ * @param status error status.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 4.4
+ */
+ UnicodeString& format(UDate date,
+ UnicodeString& appendTo,
+ FieldPositionIterator* posIter,
+ UErrorCode& status) 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;
+
+ /**
+ * Parse a date/time string. For example, a time text "07/10/96 4:5 PM, PDT"
+ * will be parsed into a UDate that is equivalent to Date(837039928046).
+ * Parsing begins at the beginning of the string and proceeds as far as
+ * possible. Assuming no parse errors were encountered, this function
+ * doesn't return any information about how much of the string was consumed
+ * by the parsing. If you need that information, use the version of
+ * parse() that takes a ParsePosition.
+ * <P>
+ * 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)
+ * <P>
+ * Note that the normal date formats associated with some calendars - such
+ * as the Chinese lunar calendar - do not specify enough fields to enable
+ * dates to be parsed unambiguously. In the case of the Chinese lunar
+ * calendar, while the year within the current 60-year cycle is specified,
+ * the number of such cycles since the start date of the calendar (in the
+ * ERA field of the Calendar object) is not normally part of the format,
+ * and parsing may assume the wrong era. For cases such as this it is
+ * recommended that clients parse using the method
+ * parse(const UnicodeString&, Calendar& cal, ParsePosition&)
+ * with the Calendar passed in set to the current date, or to a date
+ * within the era/cycle that should be assumed if absent in the format.
+ *
+ * @param text The date/time 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.
+ * @return 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).
+ * <P>
+ * 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 on input to the date and time to be used for
+ * missing values in the date/time string being parsed, and set
+ * on output to the parsed date/time. When the calendar type is
+ * different from the internal calendar held by this DateFormat
+ * instance, the internal calendar will be cloned to a work
+ * calendar set to the same milliseconds and time zone as the
+ * cal parameter, field values will be parsed based on the work
+ * calendar, then the result (milliseconds and time zone) will
+ * be set in this calendar.
+ * @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.
+ * @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).
+ * <P>
+ * 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)
+ * <P>
+ * Note that the normal date formats associated with some calendars - such
+ * as the Chinese lunar calendar - do not specify enough fields to enable
+ * dates to be parsed unambiguously. In the case of the Chinese lunar
+ * calendar, while the year within the current 60-year cycle is specified,
+ * the number of such cycles since the start date of the calendar (in the
+ * ERA field of the Calendar object) is not normally part of the format,
+ * and parsing may assume the wrong era. For cases such as this it is
+ * recommended that clients parse using the method
+ * parse(const UnicodeString&, Calendar& cal, ParsePosition&)
+ * with the Calendar passed in set to the current date, or to a date
+ * within the era/cycle that should be assumed if absent in the format.
+ *
+ * @param text The date/time string to be parsed into a UDate value.
+ * @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.
+ * <P>
+ * 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.
+ * <P>
+ * When parsing, leading whitespace is discarded (with a successful parse),
+ * while trailing whitespace is left as is.
+ * <P>
+ * 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.
+ * @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. Relative
+ * time styles are not currently supported.
+ * @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. As currently implemented, relative date formatting only
+ * affects a limited range of calendar days before or after the
+ * current date, based on the CLDR &lt;field type="day"&gt;/&lt;relative&gt; data:
+ * For example, in English, "Yesterday", "Today", and "Tomorrow".
+ * Outside of this range, dates are formatted using the corresponding
+ * non-relative style.
+ * @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. As currently
+ * implemented, relative date formatting only affects a limited range
+ * of calendar days before or after the current date, based on the
+ * CLDR &lt;field type="day"&gt;/&lt;relative&gt; data: For example, in English,
+ * "Yesterday", "Today", and "Tomorrow". Outside of this range, dates
+ * are formatted using the corresponding non-relative style.
+ * @param timeStyle The given formatting style for the time portion of the result.
+ * For example, SHORT for "h:mm a" in the US locale. Relative
+ * time styles are not currently supported.
+ * @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());
+
+#ifndef U_HIDE_INTERNAL_API
+ /**
+ * Returns the best pattern given a skeleton and locale.
+ * @param locale the locale
+ * @param skeleton the skeleton
+ * @param status ICU error returned here
+ * @return the best pattern.
+ * @internal For ICU use only.
+ */
+ static UnicodeString getBestPattern(
+ const Locale &locale,
+ const UnicodeString &skeleton,
+ UErrorCode &status);
+#endif /* U_HIDE_INTERNAL_API */
+
+ /**
+ * Creates a date/time formatter for the given skeleton and
+ * default locale.
+ *
+ * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
+ * be in any order, and this method uses the locale to
+ * map the skeleton to a pattern that includes locale
+ * specific separators with the fields in the appropriate
+ * order for that locale.
+ * @param status Any error returned here.
+ * @return A date/time formatter which the caller owns.
+ * @stable ICU 55
+ */
+ static DateFormat* U_EXPORT2 createInstanceForSkeleton(
+ const UnicodeString& skeleton,
+ UErrorCode &status);
+
+ /**
+ * Creates a date/time formatter for the given skeleton and locale.
+ *
+ * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
+ * be in any order, and this method uses the locale to
+ * map the skeleton to a pattern that includes locale
+ * specific separators with the fields in the appropriate
+ * order for that locale.
+ * @param locale The given locale.
+ * @param status Any error returned here.
+ * @return A date/time formatter which the caller owns.
+ * @stable ICU 55
+ */
+ static DateFormat* U_EXPORT2 createInstanceForSkeleton(
+ const UnicodeString& skeleton,
+ const Locale &locale,
+ UErrorCode &status);
+
+ /**
+ * Creates a date/time formatter for the given skeleton and locale.
+ *
+ * @param calendarToAdopt the calendar returned DateFormat is to use.
+ * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
+ * be in any order, and this method uses the locale to
+ * map the skeleton to a pattern that includes locale
+ * specific separators with the fields in the appropriate
+ * order for that locale.
+ * @param locale The given locale.
+ * @param status Any error returned here.
+ * @return A date/time formatter which the caller owns.
+ * @stable ICU 55
+ */
+ static DateFormat* U_EXPORT2 createInstanceForSkeleton(
+ Calendar *calendarToAdopt,
+ const UnicodeString& skeleton,
+ const Locale &locale,
+ UErrorCode &status);
+
+
+ /**
+ * 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 whether both date/time parsing in the encapsulated Calendar object and DateFormat whitespace &
+ * numeric processing is lenient.
+ * @stable ICU 2.0
+ */
+ virtual UBool isLenient(void) const;
+
+ /**
+ * Specifies whether 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. Without lenient parsing,
+ * inputs must match this object's format more closely.
+ *
+ * Note: ICU 53 introduced finer grained control of leniency (and added
+ * new control points) making the preferred method a combination of
+ * setCalendarLenient() & setBooleanAttribute() calls.
+ * This method supports prior functionality but may not support all
+ * future leniency control & behavior of DateFormat. For control of pre 53 leniency,
+ * Calendar and DateFormat whitespace & numeric tolerance, this method is safe to
+ * use. However, mixing leniency control via this method and modification of the
+ * newer attributes via setBooleanAttribute() may produce undesirable
+ * results.
+ *
+ * @param lenient True specifies date/time interpretation to be lenient.
+ * @see Calendar::setLenient
+ * @stable ICU 2.0
+ */
+ virtual void setLenient(UBool lenient);
+
+
+ /**
+ * Returns whether date/time parsing in the encapsulated Calendar object processing is lenient.
+ * @stable ICU 53
+ */
+ virtual UBool isCalendarLenient(void) const;
+
+
+ /**
+ * Specifies whether encapsulated Calendar 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. Without lenient parsing,
+ * inputs must match this object's format more closely.
+ * @param lenient when true, parsing is lenient
+ * @see com.ibm.icu.util.Calendar#setLenient
+ * @stable ICU 53
+ */
+ virtual void setCalendarLenient(UBool lenient);
+
+
+ /**
+ * Gets the calendar associated with this date/time formatter.
+ * The calendar is owned by the formatter and must not be modified.
+ * Also, the calendar does not reflect the results of a parse operation.
+ * To parse to a calendar, use {@link #parse(const UnicodeString&, Calendar& cal, ParsePosition&) const parse(const UnicodeString&, Calendar& cal, ParsePosition&)}
+ * @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);
+
+ /**
+ * Set a particular UDisplayContext value in the formatter, such as
+ * UDISPCTX_CAPITALIZATION_FOR_STANDALONE.
+ * @param value The UDisplayContext value to set.
+ * @param status Input/output status. If at entry this indicates a failure
+ * status, the function will do nothing; otherwise this will be
+ * updated with any new status from the function.
+ * @stable ICU 53
+ */
+ virtual void setContext(UDisplayContext value, UErrorCode& status);
+
+ /**
+ * Get the formatter's UDisplayContext value for the specified UDisplayContextType,
+ * such as UDISPCTX_TYPE_CAPITALIZATION.
+ * @param type The UDisplayContextType whose value to return
+ * @param status Input/output status. If at entry this indicates a failure
+ * status, the function will do nothing; otherwise this will be
+ * updated with any new status from the function.
+ * @return The UDisplayContextValue for the specified type.
+ * @stable ICU 53
+ */
+ virtual UDisplayContext getContext(UDisplayContextType type, UErrorCode& status) const;
+
+ /**
+ * Sets an boolean attribute on this DateFormat.
+ * May return U_UNSUPPORTED_ERROR if this instance does not support
+ * the specified attribute.
+ * @param attr the attribute to set
+ * @param newvalue new value
+ * @param status the error type
+ * @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) )
+ * @stable ICU 53
+ */
+
+ virtual DateFormat& U_EXPORT2 setBooleanAttribute(UDateFormatBooleanAttribute attr,
+ UBool newvalue,
+ UErrorCode &status);
+
+ /**
+ * Returns a boolean from this DateFormat
+ * May return U_UNSUPPORTED_ERROR if this instance does not support
+ * the specified attribute.
+ * @param attr the attribute to set
+ * @param status the error type
+ * @return the attribute value. Undefined if there is an error.
+ * @stable ICU 53
+ */
+ virtual UBool U_EXPORT2 getBooleanAttribute(UDateFormatBooleanAttribute attr, UErrorCode &status) const;
+
+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& inLocale);
+
+
+ /**
+ * enum set of active boolean attributes for this instance
+ */
+ EnumSet<UDateFormatBooleanAttribute, 0, UDAT_BOOLEAN_ATTRIBUTE_COUNT> fBoolFlags;
+
+
+ UDisplayContext fCapitalizationContext;
+ friend class DateFmtKeyByStyle;
+
+public:
+#ifndef U_HIDE_OBSOLETE_API
+ /**
+ * 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
+ };
+#endif /* U_HIDE_OBSOLETE_API */
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif // _DATEFMT
+//eof