This file is indexed.

/usr/include/unicode/udat.h is in libicu-dev 4.8.1.1-12+deb7u3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
/*
 *******************************************************************************
 * Copyright (C) 1996-2010, International Business Machines
 * Corporation and others. All Rights Reserved.
 *******************************************************************************
*/

#ifndef UDAT_H
#define UDAT_H

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/localpointer.h"
#include "unicode/ucal.h"
#include "unicode/unum.h"
/**
 * \file
 * \brief C API: DateFormat
 *
 * <h2> Date Format C API</h2>
 *
 * Date Format C API  consists of functions 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
 * structure UDateFormat, which can handle pretty much all normal
 * date formatting and parsing actions.
 * <P>
 * Date Format 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 with default time and date style,
 * use one of the static factory methods:
 * <pre>
 * \code
 *  UErrorCode status = U_ZERO_ERROR;
 *  UChar *myString;
 *  int32_t myStrlen = 0;
 *  UDateFormat* dfmt = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, NULL, -1, NULL, -1, &status);
 *  myStrlen = udat_format(dfmt, myDate, NULL, myStrlen, NULL, &status);
 *  if (status==U_BUFFER_OVERFLOW_ERROR){
 *      status=U_ZERO_ERROR;
 *      myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
 *      udat_format(dfmt, myDate, myString, myStrlen+1, NULL, &status);
 *  }
 * \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
 *  UErrorCode status = U_ZERO_ERROR;
 *  int32_t i, myStrlen = 0;
 *  UChar* myString;
 *  char buffer[1024];
 *  UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
 *  UDateFormat* df = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, NULL, -1, NULL, 0, &status);
 *  for (i = 0; i < 3; i++) {
 *      myStrlen = udat_format(df, myDateArr[i], NULL, myStrlen, NULL, &status);
 *      if(status == U_BUFFER_OVERFLOW_ERROR){
 *          status = U_ZERO_ERROR;
 *          myString = (UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
 *          udat_format(df, myDateArr[i], myString, myStrlen+1, NULL, &status);
 *          printf("%s\n", u_austrcpy(buffer, myString) );
 *          free(myString);
 *      }
 *  }
 * \endcode
 * </pre>
 * To get specific fields of a date, you can use UFieldPosition to
 * get specific fields.
 * <pre>
 * \code
 *  UErrorCode status = U_ZERO_ERROR;
 *  UFieldPosition pos;
 *  UChar *myString;
 *  int32_t myStrlen = 0;
 *  char buffer[1024];
 *
 *  pos.field = 1;  // Same as the DateFormat::EField enum
 *  UDateFormat* dfmt = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, -1, NULL, 0, &status);
 *  myStrlen = udat_format(dfmt, myDate, NULL, myStrlen, &pos, &status);
 *  if (status==U_BUFFER_OVERFLOW_ERROR){
 *      status=U_ZERO_ERROR;
 *      myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
 *      udat_format(dfmt, myDate, myString, myStrlen+1, &pos, &status);
 *  }
 *  printf("date format: %s\n", u_austrcpy(buffer, myString));
 *  buffer[pos.endIndex] = 0;   // NULL terminate the string.
 *  printf("UFieldPosition position equals %s\n", &buffer[pos.beginIndex]);
 * \endcode
 * </pre>
 * To format a date for a different Locale, specify it in the call to
 * udat_open()
 * <pre>
 * \code
 *        UDateFormat* df = udat_open(UDAT_SHORT, UDAT_SHORT, "fr_FR", NULL, -1, NULL, 0, &status);
 * \endcode
 * </pre>
 * You can use a DateFormat API udat_parse() to parse.
 * <pre>
 * \code
 *  UErrorCode status = U_ZERO_ERROR;
 *  int32_t parsepos=0;
 *  UDate myDate = udat_parse(df, myString, u_strlen(myString), &parsepos, &status);
 * \endcode
 * </pre>
 *  You can pass in different options for the arguments for date and time style
 *  to control the length of the result; from SHORT to MEDIUM to LONG to FULL.
 *  The exact result depends on the locale, but generally:
 *  see UDateFormatStyle for more details
 * <ul type=round>
 *   <li>   UDAT_SHORT is completely numeric, such as 12/13/52 or 3:30pm
 *   <li>   UDAT_MEDIUM is longer, such as Jan 12, 1952
 *   <li>   UDAT_LONG is longer, such as January 12, 1952 or 3:30:32pm
 *   <li>   UDAT_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.
 * <P>
 * You can also use forms of the parse and format methods with Parse Position and
 * UFieldPosition 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>
 */

/** A date formatter.
 *  For usage in C programs.
 *  @stable ICU 2.6
 */
typedef void* UDateFormat;

/** The possible date/time format styles 
 *  @stable ICU 2.6
 */
typedef enum UDateFormatStyle {
    /** Full style */
    UDAT_FULL,
    /** Long style */
    UDAT_LONG,
    /** Medium style */
    UDAT_MEDIUM,
    /** Short style */
    UDAT_SHORT,
    /** Default style */
    UDAT_DEFAULT = UDAT_MEDIUM,

    /** Bitfield for relative date */
    UDAT_RELATIVE = (1 << 7),
    
    UDAT_FULL_RELATIVE = UDAT_FULL | UDAT_RELATIVE,
        
    UDAT_LONG_RELATIVE = UDAT_LONG | UDAT_RELATIVE,
    
    UDAT_MEDIUM_RELATIVE = UDAT_MEDIUM | UDAT_RELATIVE,
    
    UDAT_SHORT_RELATIVE = UDAT_SHORT | UDAT_RELATIVE,
    
    
    /** No style */
    UDAT_NONE = -1,
    /** for internal API use only */
    UDAT_IGNORE = -2

} UDateFormatStyle;


/**
 * @{
 * Below are a set of pre-defined skeletons.
 *
 * <P>
 * A skeleton 
 * <ol>
 * <li>
 *    only keeps the field pattern letter and ignores all other parts 
 *    in a pattern, such as space, punctuations, and string literals.
 * </li>
 * <li>
 *    hides the order of fields. 
 * </li>
 * <li>
 *    might hide a field's pattern letter length.
 *
 *    For those non-digit calendar fields, the pattern letter length is 
 *    important, such as MMM, MMMM, and MMMMM; EEE and EEEE, 
 *    and the field's pattern letter length is honored.
 *    
 *    For the digit calendar fields,  such as M or MM, d or dd, yy or yyyy, 
 *    the field pattern length is ignored and the best match, which is defined 
 *    in date time patterns, will be returned without honor the field pattern
 *    letter length in skeleton.
 * </li>
 * </ol>
 *
 * @stable ICU 4.0
 */

#define UDAT_MINUTE_SECOND              "ms"
#define UDAT_HOUR24_MINUTE              "Hm"
#define UDAT_HOUR24_MINUTE_SECOND       "Hms"      
#define UDAT_HOUR_MINUTE_SECOND         "hms"
#define UDAT_STANDALONE_MONTH           "LLLL"
#define UDAT_ABBR_STANDALONE_MONTH      "LLL"
#define UDAT_YEAR_QUARTER               "yQQQ"
#define UDAT_YEAR_ABBR_QUARTER          "yQ"

/** @} */

/**
 * @{
 * Below are a set of pre-defined skeletons that 
 * have pre-defined interval patterns in resource files.
 * Users are encouraged to use them in date interval format factory methods.
 * 
 * @stable ICU 4.0
 */
#define UDAT_HOUR_MINUTE                "hm"
#define UDAT_YEAR                       "y"
#define UDAT_DAY                        "d"
#define UDAT_NUM_MONTH_WEEKDAY_DAY      "MEd"
#define UDAT_YEAR_NUM_MONTH             "yM"              
#define UDAT_NUM_MONTH_DAY              "Md"
#define UDAT_YEAR_NUM_MONTH_WEEKDAY_DAY "yMEd"
#define UDAT_ABBR_MONTH_WEEKDAY_DAY     "MMMEd"
#define UDAT_YEAR_MONTH                 "yMMMM"
#define UDAT_YEAR_ABBR_MONTH            "yMMM"
#define UDAT_MONTH_DAY                  "MMMMd"
#define UDAT_ABBR_MONTH_DAY             "MMMd" 
#define UDAT_MONTH_WEEKDAY_DAY          "MMMMEEEEd"
#define UDAT_YEAR_ABBR_MONTH_WEEKDAY_DAY "yMMMEd" 
#define UDAT_YEAR_MONTH_WEEKDAY_DAY     "yMMMMEEEEd"
#define UDAT_YEAR_MONTH_DAY             "yMMMMd"
#define UDAT_YEAR_ABBR_MONTH_DAY        "yMMMd"
#define UDAT_YEAR_NUM_MONTH_DAY         "yMd"
#define UDAT_NUM_MONTH                  "M"
#define UDAT_ABBR_MONTH                 "MMM"
#define UDAT_MONTH                      "MMMM"
#define UDAT_HOUR_MINUTE_GENERIC_TZ     "hmv"
#define UDAT_HOUR_MINUTE_TZ             "hmz"
#define UDAT_HOUR                       "h"
#define UDAT_HOUR_GENERIC_TZ            "hv"
#define UDAT_HOUR_TZ                    "hz"

/** @} */


/**
 * FieldPosition and UFieldPosition selectors for format fields
 * defined by DateFormat and UDateFormat.
 * @stable ICU 3.0
 */
typedef enum UDateFormatField {
    /**
     * FieldPosition and UFieldPosition selector for 'G' field alignment,
     * corresponding to the UCAL_ERA field.
     * @stable ICU 3.0
     */
    UDAT_ERA_FIELD = 0,

    /**
     * FieldPosition and UFieldPosition selector for 'y' field alignment,
     * corresponding to the UCAL_YEAR field.
     * @stable ICU 3.0
     */
    UDAT_YEAR_FIELD = 1,

    /**
     * FieldPosition and UFieldPosition selector for 'M' field alignment,
     * corresponding to the UCAL_MONTH field.
     * @stable ICU 3.0
     */
    UDAT_MONTH_FIELD = 2,

    /**
     * FieldPosition and UFieldPosition selector for 'd' field alignment,
     * corresponding to the UCAL_DATE field.
     * @stable ICU 3.0
     */
    UDAT_DATE_FIELD = 3,

    /**
     * FieldPosition and UFieldPosition selector for 'k' field alignment,
     * corresponding to the UCAL_HOUR_OF_DAY field.
     * UDAT_HOUR_OF_DAY1_FIELD is used for the one-based 24-hour clock.
     * For example, 23:59 + 01:00 results in 24:59.
     * @stable ICU 3.0
     */
    UDAT_HOUR_OF_DAY1_FIELD = 4,

    /**
     * FieldPosition and UFieldPosition selector for 'H' field alignment,
     * corresponding to the UCAL_HOUR_OF_DAY field.
     * UDAT_HOUR_OF_DAY0_FIELD is used for the zero-based 24-hour clock.
     * For example, 23:59 + 01:00 results in 00:59.
     * @stable ICU 3.0
     */
    UDAT_HOUR_OF_DAY0_FIELD = 5,

    /**
     * FieldPosition and UFieldPosition selector for 'm' field alignment,
     * corresponding to the UCAL_MINUTE field.
     * @stable ICU 3.0
     */
    UDAT_MINUTE_FIELD = 6,

    /**
     * FieldPosition and UFieldPosition selector for 's' field alignment,
     * corresponding to the UCAL_SECOND field.
     * @stable ICU 3.0
     */
    UDAT_SECOND_FIELD = 7,

    /**
     * FieldPosition and UFieldPosition selector for 'S' field alignment,
     * corresponding to the UCAL_MILLISECOND field.
     * @stable ICU 3.0
     */
    UDAT_FRACTIONAL_SECOND_FIELD = 8,

    /**
     * FieldPosition and UFieldPosition selector for 'E' field alignment,
     * corresponding to the UCAL_DAY_OF_WEEK field.
     * @stable ICU 3.0
     */
    UDAT_DAY_OF_WEEK_FIELD = 9,

    /**
     * FieldPosition and UFieldPosition selector for 'D' field alignment,
     * corresponding to the UCAL_DAY_OF_YEAR field.
     * @stable ICU 3.0
     */
    UDAT_DAY_OF_YEAR_FIELD = 10,

    /**
     * FieldPosition and UFieldPosition selector for 'F' field alignment,
     * corresponding to the UCAL_DAY_OF_WEEK_IN_MONTH field.
     * @stable ICU 3.0
     */
    UDAT_DAY_OF_WEEK_IN_MONTH_FIELD = 11,

    /**
     * FieldPosition and UFieldPosition selector for 'w' field alignment,
     * corresponding to the UCAL_WEEK_OF_YEAR field.
     * @stable ICU 3.0
     */
    UDAT_WEEK_OF_YEAR_FIELD = 12,

    /**
     * FieldPosition and UFieldPosition selector for 'W' field alignment,
     * corresponding to the UCAL_WEEK_OF_MONTH field.
     * @stable ICU 3.0
     */
    UDAT_WEEK_OF_MONTH_FIELD = 13,

    /**
     * FieldPosition and UFieldPosition selector for 'a' field alignment,
     * corresponding to the UCAL_AM_PM field.
     * @stable ICU 3.0
     */
    UDAT_AM_PM_FIELD = 14,

    /**
     * FieldPosition and UFieldPosition selector for 'h' field alignment,
     * corresponding to the UCAL_HOUR field.
     * UDAT_HOUR1_FIELD is used for the one-based 12-hour clock.
     * For example, 11:30 PM + 1 hour results in 12:30 AM.
     * @stable ICU 3.0
     */
    UDAT_HOUR1_FIELD = 15,

    /**
     * FieldPosition and UFieldPosition selector for 'K' field alignment,
     * corresponding to the UCAL_HOUR field.
     * UDAT_HOUR0_FIELD is used for the zero-based 12-hour clock.
     * For example, 11:30 PM + 1 hour results in 00:30 AM.
     * @stable ICU 3.0
     */
    UDAT_HOUR0_FIELD = 16,

    /**
     * FieldPosition and UFieldPosition selector for 'z' field alignment,
     * corresponding to the UCAL_ZONE_OFFSET and
     * UCAL_DST_OFFSET fields.
     * @stable ICU 3.0
     */
    UDAT_TIMEZONE_FIELD = 17,

    /**
     * FieldPosition and UFieldPosition selector for 'Y' field alignment,
     * corresponding to the UCAL_YEAR_WOY field.
     * @stable ICU 3.0
     */
    UDAT_YEAR_WOY_FIELD = 18,

    /**
     * FieldPosition and UFieldPosition selector for 'e' field alignment,
     * corresponding to the UCAL_DOW_LOCAL field.
     * @stable ICU 3.0
     */
    UDAT_DOW_LOCAL_FIELD = 19,

    /**
     * FieldPosition and UFieldPosition selector for 'u' field alignment,
     * corresponding to the UCAL_EXTENDED_YEAR field.
     * @stable ICU 3.0
     */
    UDAT_EXTENDED_YEAR_FIELD = 20,

    /**
     * FieldPosition and UFieldPosition selector for 'g' field alignment,
     * corresponding to the UCAL_JULIAN_DAY field.
     * @stable ICU 3.0
     */
    UDAT_JULIAN_DAY_FIELD = 21,

    /**
     * FieldPosition and UFieldPosition selector for 'A' field alignment,
     * corresponding to the UCAL_MILLISECONDS_IN_DAY field.
     * @stable ICU 3.0
     */
    UDAT_MILLISECONDS_IN_DAY_FIELD = 22,

    /**
     * FieldPosition and UFieldPosition selector for 'Z' field alignment,
     * corresponding to the UCAL_ZONE_OFFSET and
     * UCAL_DST_OFFSET fields.
     * @stable ICU 3.0
     */
    UDAT_TIMEZONE_RFC_FIELD = 23,

    /**
     * FieldPosition and UFieldPosition selector for 'v' field alignment,
     * corresponding to the UCAL_ZONE_OFFSET field.
     * @stable ICU 3.4
     */
    UDAT_TIMEZONE_GENERIC_FIELD = 24,
    /**
     * FieldPosition selector for 'c' field alignment,
     * corresponding to the {@link #UCAL_DOW_LOCAL} field.
     * This displays the stand alone day name, if available.
     * @stable ICU 3.4
     */
    UDAT_STANDALONE_DAY_FIELD = 25,

    /**
     * FieldPosition selector for 'L' field alignment,
     * corresponding to the {@link #UCAL_MONTH} field.
     * This displays the stand alone month name, if available.
     * @stable ICU 3.4
     */
    UDAT_STANDALONE_MONTH_FIELD = 26,

    /**
     * FieldPosition selector for "Q" field alignment,
     * corresponding to quarters. This is implemented
     * using the {@link #UCAL_MONTH} field. This
     * displays the quarter.
     * @stable ICU 3.6
     */
    UDAT_QUARTER_FIELD = 27,

    /**
     * FieldPosition selector for the "q" field alignment,
     * corresponding to stand-alone quarters. This is
     * implemented using the {@link #UCAL_MONTH} field.
     * This displays the stand-alone quarter.
     * @stable ICU 3.6
     */
    UDAT_STANDALONE_QUARTER_FIELD = 28,

    /**
     * FieldPosition and UFieldPosition selector for 'V' field alignment,
     * corresponding to the UCAL_ZONE_OFFSET field.
     * @stable ICU 3.8
     */
    UDAT_TIMEZONE_SPECIAL_FIELD = 29,

   /**
     * Number of FieldPosition and UFieldPosition selectors for
     * DateFormat and UDateFormat.
     * Valid selectors range from 0 to UDAT_FIELD_COUNT-1.
     * This value is subject to change if new fields are defined
     * in the future.
     * @stable ICU 3.0
     */
    UDAT_FIELD_COUNT = 30

} UDateFormatField;


/**
 * Maps from a UDateFormatField to the corresponding UCalendarDateFields.
 * Note: since the mapping is many-to-one, there is no inverse mapping.
 * @param field the UDateFormatField.
 * @return the UCalendarDateField.  This will be UCAL_FIELD_COUNT in case
 * of error (e.g., the input field is UDAT_FIELD_COUNT).
 * @stable ICU 4.4
 */
U_STABLE UCalendarDateFields U_EXPORT2
udat_toCalendarDateField(UDateFormatField field);


/**
 * Open a new UDateFormat for formatting and parsing dates and times.
 * A UDateFormat may be used to format dates in calls to {@link #udat_format },
 * and to parse dates in calls to {@link #udat_parse }.
 * @param timeStyle The style used to format times; one of UDAT_FULL, UDAT_LONG,
 * UDAT_MEDIUM, UDAT_SHORT, UDAT_DEFAULT, or UDAT_NONE (relative time styles
 * are not currently supported)
 * @param dateStyle The style used to format dates; one of UDAT_FULL, UDAT_LONG,
 * UDAT_MEDIUM, UDAT_SHORT, UDAT_DEFAULT, UDAT_FULL_RELATIVE, UDAT_LONG_RELATIVE,
 * UDAT_MEDIUM_RELATIVE, UDAT_SHORT_RELATIVE, or UDAT_NONE
 * @param locale The locale specifying the formatting conventions
 * @param tzID A timezone ID specifying the timezone to use.  If 0, use
 * the default timezone.
 * @param tzIDLength The length of tzID, or -1 if null-terminated.
 * @param pattern A pattern specifying the format to use.
 * @param patternLength The number of characters in the pattern, or -1 if null-terminated.
 * @param status A pointer to an UErrorCode to receive any errors
 * @return A pointer to a UDateFormat to use for formatting dates and times, or 0 if
 * an error occurred.
 * @stable ICU 2.0
 */
U_STABLE UDateFormat* U_EXPORT2 
udat_open(UDateFormatStyle  timeStyle,
          UDateFormatStyle  dateStyle,
          const char        *locale,
          const UChar       *tzID,
          int32_t           tzIDLength,
          const UChar       *pattern,
          int32_t           patternLength,
          UErrorCode        *status);


/**
* Close a UDateFormat.
* Once closed, a UDateFormat may no longer be used.
* @param format The formatter to close.
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_close(UDateFormat* format);

#if U_SHOW_CPLUSPLUS_API

U_NAMESPACE_BEGIN

/**
 * \class LocalUDateFormatPointer
 * "Smart pointer" class, closes a UDateFormat via udat_close().
 * For most methods see the LocalPointerBase base class.
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @stable ICU 4.4
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUDateFormatPointer, UDateFormat, udat_close);

U_NAMESPACE_END

#endif

/**
 * Open a copy of a UDateFormat.
 * This function performs a deep copy.
 * @param fmt The format to copy
 * @param status A pointer to an UErrorCode to receive any errors.
 * @return A pointer to a UDateFormat identical to fmt.
 * @stable ICU 2.0
 */
U_STABLE UDateFormat* U_EXPORT2 
udat_clone(const UDateFormat *fmt,
       UErrorCode *status);

/**
* Format a date using an UDateFormat.
* The date will be formatted using the conventions specified in {@link #udat_open }
* @param format The formatter to use
* @param dateToFormat The date to format
* @param result A pointer to a buffer to receive the formatted number.
* @param resultLength The maximum size of result.
* @param position A pointer to a UFieldPosition.  On input, position->field
* is read.  On output, position->beginIndex and position->endIndex indicate
* the beginning and ending indices of field number position->field, if such
* a field exists.  This parameter may be NULL, in which case no field
* position data is returned.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_parse
* @see UFieldPosition
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2 
udat_format(    const    UDateFormat*    format,
                        UDate           dateToFormat,
                        UChar*          result,
                        int32_t         resultLength,
                        UFieldPosition* position,
                        UErrorCode*     status);

/**
* Parse a string into an date/time using a UDateFormat.
* The date will be parsed using the conventions specified in {@link #udat_open }
* @param format The formatter to use.
* @param text The text to parse.
* @param textLength The length of text, or -1 if null-terminated.
* @param parsePos If not 0, on input a pointer to an integer specifying the offset at which
* to begin parsing.  If not 0, on output the offset at which parsing ended.
* @param status A pointer to an UErrorCode to receive any errors
* @return The value of the parsed date/time
* @see udat_format
* @stable ICU 2.0
*/
U_STABLE UDate U_EXPORT2 
udat_parse(    const    UDateFormat*    format,
            const    UChar*          text,
                    int32_t         textLength,
                    int32_t         *parsePos,
                    UErrorCode      *status);

/**
* Parse a string into an date/time using a UDateFormat.
* The date will be parsed using the conventions specified in {@link #udat_open }
* @param format The formatter to use.
* @param calendar The calendar in which to store the parsed data.
* @param text The text to parse.
* @param textLength The length of text, or -1 if null-terminated.
* @param parsePos If not 0, on input a pointer to an integer specifying the offset at which
* to begin parsing.  If not 0, on output the offset at which parsing ended.
* @param status A pointer to an UErrorCode to receive any errors
* @see udat_format
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_parseCalendar(const    UDateFormat*    format,
                            UCalendar*      calendar,
                   const    UChar*          text,
                            int32_t         textLength,
                            int32_t         *parsePos,
                            UErrorCode      *status);

/**
* Determine if an UDateFormat will perform lenient parsing.
* With lenient parsing, the parser may use heuristics to interpret inputs that do not
* precisely match the pattern. With strict parsing, inputs must match the pattern.
* @param fmt The formatter to query
* @return TRUE if fmt is set to perform lenient parsing, FALSE otherwise.
* @see udat_setLenient
* @stable ICU 2.0
*/
U_STABLE UBool U_EXPORT2 
udat_isLenient(const UDateFormat* fmt);

/**
* Specify whether an UDateFormat will perform lenient parsing.
* With lenient parsing, the parser may use heuristics to interpret inputs that do not
* precisely match the pattern. With strict parsing, inputs must match the pattern.
* @param fmt The formatter to set
* @param isLenient TRUE if fmt should perform lenient parsing, FALSE otherwise.
* @see dat_isLenient
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_setLenient(    UDateFormat*    fmt,
                    UBool          isLenient);

/**
* Get the UCalendar associated with an UDateFormat.
* A UDateFormat uses a UCalendar to convert a raw value to, for example,
* the day of the week.
* @param fmt The formatter to query.
* @return A pointer to the UCalendar used by fmt.
* @see udat_setCalendar
* @stable ICU 2.0
*/
U_STABLE const UCalendar* U_EXPORT2 
udat_getCalendar(const UDateFormat* fmt);

/**
* Set the UCalendar associated with an UDateFormat.
* A UDateFormat uses a UCalendar to convert a raw value to, for example,
* the day of the week.
* @param fmt The formatter to set.
* @param calendarToSet A pointer to an UCalendar to be used by fmt.
* @see udat_setCalendar
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_setCalendar(            UDateFormat*    fmt,
                    const   UCalendar*      calendarToSet);

/**
* Get the UNumberFormat associated with an UDateFormat.
* A UDateFormat uses a UNumberFormat to format numbers within a date,
* for example the day number.
* @param fmt The formatter to query.
* @return A pointer to the UNumberFormat used by fmt to format numbers.
* @see udat_setNumberFormat
* @stable ICU 2.0
*/
U_STABLE const UNumberFormat* U_EXPORT2 
udat_getNumberFormat(const UDateFormat* fmt);

/**
* Set the UNumberFormat associated with an UDateFormat.
* A UDateFormat uses a UNumberFormat to format numbers within a date,
* for example the day number.
* @param fmt The formatter to set.
* @param numberFormatToSet A pointer to the UNumberFormat to be used by fmt to format numbers.
* @see udat_getNumberFormat
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_setNumberFormat(            UDateFormat*    fmt,
                        const   UNumberFormat*  numberFormatToSet);

/**
* Get a locale for which date/time formatting patterns are available.
* A UDateFormat in a locale returned by this function will perform the correct
* formatting and parsing for the locale.
* @param localeIndex The index of the desired locale.
* @return A locale for which date/time formatting patterns are available, or 0 if none.
* @see udat_countAvailable
* @stable ICU 2.0
*/
U_STABLE const char* U_EXPORT2 
udat_getAvailable(int32_t localeIndex);

/**
* Determine how many locales have date/time  formatting patterns available.
* This function is most useful as determining the loop ending condition for
* calls to {@link #udat_getAvailable }.
* @return The number of locales for which date/time formatting patterns are available.
* @see udat_getAvailable
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2 
udat_countAvailable(void);

/**
* Get the year relative to which all 2-digit years are interpreted.
* For example, if the 2-digit start year is 2100, the year 99 will be
* interpreted as 2199.
* @param fmt The formatter to query.
* @param status A pointer to an UErrorCode to receive any errors
* @return The year relative to which all 2-digit years are interpreted.
* @see udat_Set2DigitYearStart
* @stable ICU 2.0
*/
U_STABLE UDate U_EXPORT2 
udat_get2DigitYearStart(    const   UDateFormat     *fmt,
                                    UErrorCode      *status);

/**
* Set the year relative to which all 2-digit years will be interpreted.
* For example, if the 2-digit start year is 2100, the year 99 will be
* interpreted as 2199.
* @param fmt The formatter to set.
* @param d The year relative to which all 2-digit years will be interpreted.
* @param status A pointer to an UErrorCode to receive any errors
* @see udat_Set2DigitYearStart
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_set2DigitYearStart(    UDateFormat     *fmt,
                            UDate           d,
                            UErrorCode      *status);

/**
* Extract the pattern from a UDateFormat.
* The pattern will follow the pattern syntax rules.
* @param fmt The formatter to query.
* @param localized TRUE if the pattern should be localized, FALSE otherwise.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_applyPattern
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2 
udat_toPattern(    const   UDateFormat     *fmt,
                        UBool          localized,
                        UChar           *result,
                        int32_t         resultLength,
                        UErrorCode      *status);

/**
* Set the pattern used by an UDateFormat.
* The pattern should follow the pattern syntax rules.
* @param format The formatter to set.
* @param localized TRUE if the pattern is localized, FALSE otherwise.
* @param pattern The new pattern
* @param patternLength The length of pattern, or -1 if null-terminated.
* @see udat_toPattern
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_applyPattern(            UDateFormat     *format,
                            UBool          localized,
                    const   UChar           *pattern,
                            int32_t         patternLength);

/** 
 * The possible types of date format symbols 
 * @stable ICU 2.6
 */
typedef enum UDateFormatSymbolType {
    /** The era names, for example AD */
    UDAT_ERAS,
    /** The month names, for example February */
    UDAT_MONTHS,
    /** The short month names, for example Feb. */
    UDAT_SHORT_MONTHS,
    /** The weekday names, for example Monday */
    UDAT_WEEKDAYS,
    /** The short weekday names, for example Mon. */
    UDAT_SHORT_WEEKDAYS,
    /** The AM/PM names, for example AM */
    UDAT_AM_PMS,
    /** The localized characters */
    UDAT_LOCALIZED_CHARS,
    /** The long era names, for example Anno Domini */
    UDAT_ERA_NAMES,
    /** The narrow month names, for example F */
    UDAT_NARROW_MONTHS,
    /** The narrow weekday names, for example N */
    UDAT_NARROW_WEEKDAYS,
    /** Standalone context versions of months */
    UDAT_STANDALONE_MONTHS,
    UDAT_STANDALONE_SHORT_MONTHS,
    UDAT_STANDALONE_NARROW_MONTHS,
    /** Standalone context versions of weekdays */
    UDAT_STANDALONE_WEEKDAYS,
    UDAT_STANDALONE_SHORT_WEEKDAYS,
    UDAT_STANDALONE_NARROW_WEEKDAYS,
    /** The quarters, for example 1st Quarter */
    UDAT_QUARTERS,
    /** The short quarter names, for example Q1 */
    UDAT_SHORT_QUARTERS,
    /** Standalone context versions of quarters */
    UDAT_STANDALONE_QUARTERS,
    UDAT_STANDALONE_SHORT_QUARTERS

} UDateFormatSymbolType;

struct UDateFormatSymbols;
/** Date format symbols.
 *  For usage in C programs.
 *  @stable ICU 2.6
 */
typedef struct UDateFormatSymbols UDateFormatSymbols;

/**
* Get the symbols associated with an UDateFormat.
* The symbols are what a UDateFormat uses to represent locale-specific data,
* for example month or day names.
* @param fmt The formatter to query.
* @param type The type of symbols to get.  One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @param symbolIndex The desired symbol of type type.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_countSymbols
* @see udat_setSymbols
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2 
udat_getSymbols(const   UDateFormat             *fmt,
                        UDateFormatSymbolType   type,
                        int32_t                 symbolIndex,
                        UChar                   *result,
                        int32_t                 resultLength,
                        UErrorCode              *status);

/**
* Count the number of particular symbols for an UDateFormat.
* This function is most useful as for detemining the loop termination condition
* for calls to {@link #udat_getSymbols }.
* @param fmt The formatter to query.
* @param type The type of symbols to count.  One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @return The number of symbols of type type.
* @see udat_getSymbols
* @see udat_setSymbols
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2 
udat_countSymbols(    const    UDateFormat                *fmt,
                            UDateFormatSymbolType    type);

/**
* Set the symbols associated with an UDateFormat.
* The symbols are what a UDateFormat uses to represent locale-specific data,
* for example month or day names.
* @param format The formatter to set
* @param type The type of symbols to set.  One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @param symbolIndex The index of the symbol to set of type type.
* @param value The new value
* @param valueLength The length of value, or -1 if null-terminated
* @param status A pointer to an UErrorCode to receive any errors
* @see udat_getSymbols
* @see udat_countSymbols
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2 
udat_setSymbols(    UDateFormat             *format,
                    UDateFormatSymbolType   type,
                    int32_t                 symbolIndex,
                    UChar                   *value,
                    int32_t                 valueLength,
                    UErrorCode              *status);

/**
 * Get the locale for this date format object.
 * You can choose between valid and actual locale.
 * @param fmt The formatter to get the locale from
 * @param type type of the locale we're looking for (valid or actual) 
 * @param status error code for the operation
 * @return the locale name
 * @stable ICU 2.8
 */
U_STABLE const char* U_EXPORT2
udat_getLocaleByType(const UDateFormat *fmt,
                     ULocDataLocaleType type,
                     UErrorCode* status); 

/**
* Extract the date pattern from a UDateFormat set for relative date formatting.
* The pattern will follow the pattern syntax rules.
* @param fmt The formatter to query.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to a UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_applyPatternRelative
* @internal ICU 4.2 technology preview
*/
U_INTERNAL int32_t U_EXPORT2 
udat_toPatternRelativeDate(const UDateFormat *fmt,
                           UChar             *result,
                           int32_t           resultLength,
                           UErrorCode        *status);

/**
* Extract the time pattern from a UDateFormat set for relative date formatting.
* The pattern will follow the pattern syntax rules.
* @param fmt The formatter to query.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to a UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_applyPatternRelative
* @internal ICU 4.2 technology preview
*/
U_INTERNAL int32_t U_EXPORT2 
udat_toPatternRelativeTime(const UDateFormat *fmt,
                           UChar             *result,
                           int32_t           resultLength,
                           UErrorCode        *status);

/**
* Set the date & time patterns used by a UDateFormat set for relative date formatting.
* The patterns should follow the pattern syntax rules.
* @param format The formatter to set.
* @param datePattern The new date pattern
* @param datePatternLength The length of datePattern, or -1 if null-terminated.
* @param timePattern The new time pattern
* @param timePatternLength The length of timePattern, or -1 if null-terminated.
* @param status A pointer to a UErrorCode to receive any errors
* @see udat_toPatternRelativeDate, udat_toPatternRelativeTime
* @internal ICU 4.2 technology preview
*/
U_INTERNAL void U_EXPORT2 
udat_applyPatternRelative(UDateFormat *format,
                          const UChar *datePattern,
                          int32_t     datePatternLength,
                          const UChar *timePattern,
                          int32_t     timePatternLength,
                          UErrorCode  *status);


#endif /* #if !UCONFIG_NO_FORMATTING */

#endif