FM / unicode

/opt/alt/libicu/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27056	0644	edit dl rm
appendable.h	8632	0644	edit dl rm
basictz.h	9055	0644	edit dl rm
brkiter.h	28195	0644	edit dl rm
bytestream.h	9767	0644	edit dl rm
bytestrie.h	19718	0644	edit dl rm
bytestriebuilder.h	7186	0644	edit dl rm
calendar.h	107581	0644	edit dl rm
caniter.h	7550	0644	edit dl rm
casemap.h	25871	0644	edit dl rm
char16ptr.h	7331	0644	edit dl rm
chariter.h	24573	0644	edit dl rm
choicfmt.h	24418	0644	edit dl rm
coleitr.h	14033	0644	edit dl rm
coll.h	56928	0644	edit dl rm
compactdecimalformat.h	6971	0644	edit dl rm
curramt.h	3782	0644	edit dl rm
currpinf.h	7412	0644	edit dl rm
currunit.h	3606	0644	edit dl rm
datefmt.h	41334	0644	edit dl rm
dbbi.h	1133	0644	edit dl rm
dcfmtsym.h	20584	0644	edit dl rm
decimfmt.h	88478	0644	edit dl rm
docmain.h	6878	0644	edit dl rm
dtfmtsym.h	38548	0644	edit dl rm
dtintrv.h	3848	0644	edit dl rm
dtitvfmt.h	43898	0644	edit dl rm
dtitvinf.h	18903	0644	edit dl rm
dtptngen.h	25626	0644	edit dl rm
dtrule.h	8831	0644	edit dl rm
edits.h	21169	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4894	0644	edit dl rm
fieldpos.h	8838	0644	edit dl rm
filteredbrk.h	5364	0644	edit dl rm
fmtable.h	24946	0644	edit dl rm
format.h	12741	0644	edit dl rm
fpositer.h	3047	0644	edit dl rm
gender.h	3347	0644	edit dl rm
gregocal.h	32331	0644	edit dl rm
icudataver.h	1051	0644	edit dl rm
icuplug.h	12166	0644	edit dl rm
idna.h	12938	0644	edit dl rm
listformatter.h	6331	0644	edit dl rm
localpointer.h	17284	0644	edit dl rm
locdspnm.h	7224	0644	edit dl rm
locid.h	46001	0644	edit dl rm
measfmt.h	12298	0644	edit dl rm
measunit.h	39427	0644	edit dl rm
measure.h	4361	0644	edit dl rm
messagepattern.h	34460	0644	edit dl rm
msgfmt.h	44398	0644	edit dl rm
normalizer2.h	34789	0644	edit dl rm
normlzr.h	31476	0644	edit dl rm
nounit.h	2693	0644	edit dl rm
numberformatter.h	89164	0644	edit dl rm
numberrangeformatter.h	29430	0644	edit dl rm
numfmt.h	50322	0644	edit dl rm
numsys.h	6895	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5581	0644	edit dl rm
platform.h	27754	0644	edit dl rm
plurfmt.h	25786	0644	edit dl rm
plurrule.h	17834	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6487	0644	edit dl rm
rbbi.h	27047	0644	edit dl rm
rbnf.h	50984	0644	edit dl rm
rbtz.h	15838	0644	edit dl rm
regex.h	86943	0644	edit dl rm
region.h	9342	0644	edit dl rm
reldatefmt.h	14812	0644	edit dl rm
rep.h	9726	0644	edit dl rm
resbund.h	18440	0644	edit dl rm
schriter.h	6410	0644	edit dl rm
scientificnumberformatter.h	6474	0644	edit dl rm
search.h	22742	0644	edit dl rm
selfmt.h	14579	0644	edit dl rm
simpleformatter.h	11701	0644	edit dl rm
simpletz.h	46389	0644	edit dl rm
smpdtfmt.h	72442	0644	edit dl rm
sortkey.h	11383	0644	edit dl rm
std_string.h	1015	0644	edit dl rm
strenum.h	10279	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	6610	0644	edit dl rm
stringtriebuilder.h	15636	0644	edit dl rm
stsearch.h	21801	0644	edit dl rm
symtable.h	4312	0644	edit dl rm
tblcoll.h	37272	0644	edit dl rm
timezone.h	41862	0644	edit dl rm
tmunit.h	3371	0644	edit dl rm
tmutamt.h	4918	0644	edit dl rm
tmutfmt.h	7977	0644	edit dl rm
translit.h	67339	0644	edit dl rm
tzfmt.h	43846	0644	edit dl rm
tznames.h	17190	0644	edit dl rm
tzrule.h	36170	0644	edit dl rm
tztrans.h	6214	0644	edit dl rm
ubidi.h	91711	0644	edit dl rm
ubiditransform.h	12950	0644	edit dl rm
ubrk.h	24547	0644	edit dl rm
ucal.h	56526	0644	edit dl rm
ucasemap.h	15546	0644	edit dl rm
ucat.h	5484	0644	edit dl rm
uchar.h	143314	0644	edit dl rm
ucharstrie.h	21569	0644	edit dl rm
ucharstriebuilder.h	7316	0644	edit dl rm
uchriter.h	13457	0644	edit dl rm
uclean.h	11474	0644	edit dl rm
ucnv.h	85085	0644	edit dl rm
ucnvsel.h	6283	0644	edit dl rm
ucnv_cb.h	6748	0644	edit dl rm
ucnv_err.h	21492	0644	edit dl rm
ucol.h	62864	0644	edit dl rm
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uconfig.h	11949	0644	edit dl rm
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ucptrie.h	22824	0644	edit dl rm
ucsdet.h	15018	0644	edit dl rm
ucurr.h	15947	0644	edit dl rm
udat.h	61572	0644	edit dl rm
udata.h	15905	0644	edit dl rm
udateintervalformat.h	6950	0644	edit dl rm
udatpg.h	26664	0644	edit dl rm
udisplaycontext.h	6029	0644	edit dl rm
uenum.h	7970	0644	edit dl rm
ufieldpositer.h	4461	0644	edit dl rm
uformattable.h	11198	0644	edit dl rm
ugender.h	2052	0644	edit dl rm
uidna.h	34169	0644	edit dl rm
uiter.h	23319	0644	edit dl rm
uldnames.h	10702	0644	edit dl rm
ulistformatter.h	5148	0644	edit dl rm
uloc.h	51971	0644	edit dl rm
ulocdata.h	11533	0644	edit dl rm
umachine.h	13509	0644	edit dl rm
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umsg.h	24812	0644	edit dl rm
umutablecptrie.h	8477	0644	edit dl rm
unifilt.h	3716	0644	edit dl rm
unifunct.h	4079	0644	edit dl rm
unimatch.h	6184	0644	edit dl rm
unirepl.h	3403	0644	edit dl rm
uniset.h	65796	0644	edit dl rm
unistr.h	178587	0644	edit dl rm
unorm.h	20938	0644	edit dl rm
unorm2.h	25254	0644	edit dl rm
unum.h	54666	0644	edit dl rm
unumberformatter.h	24335	0644	edit dl rm
unumsys.h	7314	0644	edit dl rm
uobject.h	10958	0644	edit dl rm
upluralrules.h	6880	0644	edit dl rm
uregex.h	73784	0644	edit dl rm
uregion.h	10073	0644	edit dl rm
ureldatefmt.h	12518	0644	edit dl rm
urename.h	130791	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37404	0644	edit dl rm
uscript.h	27153	0644	edit dl rm
usearch.h	39038	0644	edit dl rm
uset.h	40958	0644	edit dl rm
usetiter.h	9719	0644	edit dl rm
ushape.h	18432	0644	edit dl rm
uspoof.h	67613	0644	edit dl rm
usprep.h	8331	0644	edit dl rm
ustdio.h	39469	0644	edit dl rm
ustream.h	1844	0644	edit dl rm
ustring.h	74211	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59503	0644	edit dl rm
utf.h	8046	0644	edit dl rm
utf8.h	30734	0644	edit dl rm
utf16.h	22866	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	44827	0644	edit dl rm
utmscale.h	14113	0644	edit dl rm
utrace.h	14219	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31212	0644	edit dl rm
uvernum.h	6206	0644	edit dl rm
uversion.h	6865	0644	edit dl rm
vtzone.h	20651	0644	edit dl rm

Edit: /opt/alt/libicu/usr/include/unicode/datefmt.h (41334B)

// © 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;

/**
 * \cond
 * Export an explicit template instantiation. (See digitlst.h, datefmt.h, and others.)
 * (When building DLLs for Windows this is required.)
 */
#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN && !defined(U_IN_DOXYGEN)
template class U_I18N_API EnumSet<UDateFormatBooleanAttribute,
 0, 
 UDAT_BOOLEAN_ATTRIBUTE_COUNT>;
#endif
/** \endcond */

/**
 * 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.
 * 
 * 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:
 * <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.
 * 
 * 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>
 *
 * 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,
     * 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 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.
 * 
 * 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. 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.
 * 
 * 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.
     *
     * @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.
 * 
 * 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)
 * 
 * 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).
 * 
 * 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).
 * 
 * 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)
 * 
 * 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.
 * 
 * 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.
 * @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

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