Check in the pristine copy of ICU 4.6...

icu46/source/i18n/hebrwcal.cpp

+/*
+******************************************************************************
+* Copyright (C) 2003-2008, International Business Machines Corporation
+* and others. All Rights Reserved.
+******************************************************************************
+*
+* File HEBRWCAL.CPP
+*
+* Modification History:
+*
+*   Date        Name        Description
+*   12/03/2003  srl         ported from java HebrewCalendar
+*****************************************************************************
+*/
+
+#include "hebrwcal.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "umutex.h"
+#include <float.h>
+#include "gregoimp.h" // Math
+#include "astro.h" // CalendarAstronomer
+#include "uhash.h"
+#include "ucln_in.h"
+
+// Hebrew Calendar implementation
+
+/**
+* The absolute date, in milliseconds since 1/1/1970 AD, Gregorian,
+* of the start of the Hebrew calendar.  In order to keep this calendar's
+* time of day in sync with that of the Gregorian calendar, we use
+* midnight, rather than sunset the day before.
+*/
+//static const double EPOCH_MILLIS = -180799862400000.; // 1/1/1 HY
+
+static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
+    // Minimum  Greatest    Least  Maximum
+    //           Minimum  Maximum
+    {        0,        0,        0,        0}, // ERA
+    { -5000000, -5000000,  5000000,  5000000}, // YEAR
+    {        0,        0,       12,       12}, // MONTH
+    {        1,        1,       51,       56}, // WEEK_OF_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
+    {        1,        1,       29,       30}, // DAY_OF_MONTH
+    {        1,        1,      353,      385}, // DAY_OF_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
+    {       -1,       -1,        5,        5}, // DAY_OF_WEEK_IN_MONTH
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
+    { -5000000, -5000000,  5000000,  5000000}, // YEAR_WOY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
+    { -5000000, -5000000,  5000000,  5000000}, // EXTENDED_YEAR
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
+    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
+};
+
+/**
+* The lengths of the Hebrew months.  This is complicated, because there
+* are three different types of years, or six if you count leap years.
+* Due to the rules for postponing the start of the year to avoid having
+* certain holidays fall on the sabbath, the year can end up being three
+* different lengths, called "deficient", "normal", and "complete".
+*/
+static const int8_t MONTH_LENGTH[][3] = {
+    // Deficient  Normal     Complete
+    {   30,         30,         30     },           //Tishri
+    {   29,         29,         30     },           //Heshvan
+    {   29,         30,         30     },           //Kislev
+    {   29,         29,         29     },           //Tevet
+    {   30,         30,         30     },           //Shevat
+    {   30,         30,         30     },           //Adar I (leap years only)
+    {   29,         29,         29     },           //Adar
+    {   30,         30,         30     },           //Nisan
+    {   29,         29,         29     },           //Iyar
+    {   30,         30,         30     },           //Sivan
+    {   29,         29,         29     },           //Tammuz
+    {   30,         30,         30     },           //Av
+    {   29,         29,         29     },           //Elul
+};
+
+/**
+* The cumulative # of days to the end of each month in a non-leap year
+* Although this can be calculated from the MONTH_LENGTH table,
+* keeping it around separately makes some calculations a lot faster
+*/
+
+static const int16_t MONTH_START[][3] = {
+    // Deficient  Normal     Complete
+    {    0,          0,          0  },          // (placeholder)
+    {   30,         30,         30  },          // Tishri
+    {   59,         59,         60  },          // Heshvan
+    {   88,         89,         90  },          // Kislev
+    {  117,        118,        119  },          // Tevet
+    {  147,        148,        149  },          // Shevat
+    {  147,        148,        149  },          // (Adar I placeholder)
+    {  176,        177,        178  },          // Adar
+    {  206,        207,        208  },          // Nisan
+    {  235,        236,        237  },          // Iyar
+    {  265,        266,        267  },          // Sivan
+    {  294,        295,        296  },          // Tammuz
+    {  324,        325,        326  },          // Av
+    {  353,        354,        355  },          // Elul
+};
+
+/**
+* The cumulative # of days to the end of each month in a leap year
+*/
+static const int16_t  LEAP_MONTH_START[][3] = {
+    // Deficient  Normal     Complete
+    {    0,          0,          0  },          // (placeholder)
+    {   30,         30,         30  },          // Tishri
+    {   59,         59,         60  },          // Heshvan
+    {   88,         89,         90  },          // Kislev
+    {  117,        118,        119  },          // Tevet
+    {  147,        148,        149  },          // Shevat
+    {  177,        178,        179  },          // Adar I
+    {  206,        207,        208  },          // Adar II
+    {  236,        237,        238  },          // Nisan
+    {  265,        266,        267  },          // Iyar
+    {  295,        296,        297  },          // Sivan
+    {  324,        325,        326  },          // Tammuz
+    {  354,        355,        356  },          // Av
+    {  383,        384,        385  },          // Elul
+};
+
+static U_NAMESPACE_QUALIFIER CalendarCache *gCache =  NULL;
+
+U_CDECL_BEGIN
+static UBool calendar_hebrew_cleanup(void) {
+    delete gCache;
+    gCache = NULL;
+    return TRUE;
+}
+U_CDECL_END
+
+U_NAMESPACE_BEGIN
+//-------------------------------------------------------------------------
+// Constructors...
+//-------------------------------------------------------------------------
+
+/**
+* Constructs a default <code>HebrewCalendar</code> using the current time
+* in the default time zone with the default locale.
+* @internal
+*/
+HebrewCalendar::HebrewCalendar(const Locale& aLocale, UErrorCode& success)
+:   Calendar(TimeZone::createDefault(), aLocale, success)
+
+{
+    setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+
+HebrewCalendar::~HebrewCalendar() {
+}
+
+const char *HebrewCalendar::getType() const {
+    return "hebrew";
+}
+
+Calendar* HebrewCalendar::clone() const {
+    return new HebrewCalendar(*this);
+}
+
+HebrewCalendar::HebrewCalendar(const HebrewCalendar& other) : Calendar(other) {
+}
+
+
+//-------------------------------------------------------------------------
+// Rolling and adding functions overridden from Calendar
+//
+// These methods call through to the default implementation in IBMCalendar
+// for most of the fields and only handle the unusual ones themselves.
+//-------------------------------------------------------------------------
+
+/**
+* Add a signed amount to a specified field, using this calendar's rules.
+* For example, to add three days to the current date, you can call
+* <code>add(Calendar.DATE, 3)</code>. 
+* <p>
+* When adding to certain fields, the values of other fields may conflict and
+* need to be changed.  For example, when adding one to the {@link #MONTH MONTH} field
+* for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
+* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
+* "30 Elul 5758".
+* <p>
+* This method is able to add to
+* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
+* and {@link #ZONE_OFFSET ZONE_OFFSET}.
+* <p>
+* <b>Note:</b> You should always use {@link #roll roll} and add rather
+* than attempting to perform arithmetic operations directly on the fields
+* of a <tt>HebrewCalendar</tt>.  Since the {@link #MONTH MONTH} field behaves
+* discontinuously in non-leap years, simple arithmetic can give invalid results.
+* <p>
+* @param field     the time field.
+* @param amount    the amount to add to the field.
+*
+* @exception   IllegalArgumentException if the field is invalid or refers
+*              to a field that cannot be handled by this method.
+* @internal
+*/
+void HebrewCalendar::add(UCalendarDateFields field, int32_t amount, UErrorCode& status)
+{
+    if(U_FAILURE(status)) {
+        return;
+    }
+    switch (field) {
+  case UCAL_MONTH: 
+      {
+          // We can't just do a set(MONTH, get(MONTH) + amount).  The
+          // reason is ADAR_1.  Suppose amount is +2 and we land in
+          // ADAR_1 -- then we have to bump to ADAR_2 aka ADAR.  But
+          // if amount is -2 and we land in ADAR_1, then we have to
+          // bump the other way -- down to SHEVAT.  - Alan 11/00
+          int32_t month = get(UCAL_MONTH, status);
+          int32_t year = get(UCAL_YEAR, status);
+          UBool acrossAdar1;
+          if (amount > 0) {
+              acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
+              month += amount;
+              for (;;) {
+                  if (acrossAdar1 && month>=ADAR_1 && !isLeapYear(year)) {
+                      ++month;
+                  }
+                  if (month <= ELUL) {
+                      break;
+                  }
+                  month -= ELUL+1;
+                  ++year;
+                  acrossAdar1 = TRUE;
+              }
+          } else {
+              acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
+              month += amount;
+              for (;;) {
+                  if (acrossAdar1 && month<=ADAR_1 && !isLeapYear(year)) {
+                      --month;
+                  }
+                  if (month >= 0) {
+                      break;
+                  }
+                  month += ELUL+1;
+                  --year;
+                  acrossAdar1 = TRUE;
+              }
+          }
+          set(UCAL_MONTH, month);
+          set(UCAL_YEAR, year);
+          pinField(UCAL_DAY_OF_MONTH, status);
+          break;
+      }
+
+  default:
+      Calendar::add(field, amount, status);
+      break;
+    }
+}
+
+/**
+* @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
+*/
+void HebrewCalendar::add(EDateFields field, int32_t amount, UErrorCode& status)
+{
+    add((UCalendarDateFields)field, amount, status);
+}
+
+/**
+* Rolls (up/down) a specified amount time on the given field.  For
+* example, to roll the current date up by three days, you can call
+* <code>roll(Calendar.DATE, 3)</code>.  If the
+* field is rolled past its maximum allowable value, it will "wrap" back
+* to its minimum and continue rolling.  
+* For example, calling <code>roll(Calendar.DATE, 10)</code>
+* on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
+* <p>
+* When rolling certain fields, the values of other fields may conflict and
+* need to be changed.  For example, when rolling the {@link #MONTH MONTH} field
+* upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
+* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
+* "30 Elul".
+* <p>
+* This method is able to roll
+* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
+* and {@link #ZONE_OFFSET ZONE_OFFSET}.  Subclasses may, of course, add support for
+* additional fields in their overrides of <code>roll</code>.
+* <p>
+* <b>Note:</b> You should always use roll and {@link #add add} rather
+* than attempting to perform arithmetic operations directly on the fields
+* of a <tt>HebrewCalendar</tt>.  Since the {@link #MONTH MONTH} field behaves
+* discontinuously in non-leap years, simple arithmetic can give invalid results.
+* <p>
+* @param field     the time field.
+* @param amount    the amount by which the field should be rolled.
+*
+* @exception   IllegalArgumentException if the field is invalid or refers
+*              to a field that cannot be handled by this method.
+* @internal
+*/
+void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
+{
+    if(U_FAILURE(status)) {
+        return;
+    }
+    switch (field) {
+  case UCAL_MONTH:
+      {
+          int32_t month = get(UCAL_MONTH, status);
+          int32_t year = get(UCAL_YEAR, status);
+
+          UBool leapYear = isLeapYear(year);
+          int32_t yearLength = monthsInYear(year);
+          int32_t newMonth = month + (amount % yearLength);
+          //
+          // If it's not a leap year and we're rolling past the missing month
+          // of ADAR_1, we need to roll an extra month to make up for it.
+          //
+          if (!leapYear) {
+              if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
+                  newMonth++;
+              } else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
+                  newMonth--;
+              }
+          }
+          set(UCAL_MONTH, (newMonth + 13) % 13);
+          pinField(UCAL_DAY_OF_MONTH, status);
+          return;
+      }
+  default:
+      Calendar::roll(field, amount, status);
+    }
+}
+
+void HebrewCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
+    roll((UCalendarDateFields)field, amount, status);
+}
+
+//-------------------------------------------------------------------------
+// Support methods
+//-------------------------------------------------------------------------
+
+// Hebrew date calculations are performed in terms of days, hours, and
+// "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
+static const int32_t HOUR_PARTS = 1080;
+static const int32_t DAY_PARTS  = 24*HOUR_PARTS;
+
+// An approximate value for the length of a lunar month.
+// It is used to calculate the approximate year and month of a given
+// absolute date.
+static const int32_t  MONTH_DAYS = 29;
+static const int32_t MONTH_FRACT = 12*HOUR_PARTS + 793;
+static const int32_t MONTH_PARTS = MONTH_DAYS*DAY_PARTS + MONTH_FRACT;
+
+// The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
+// counting from noon on the day before.  BAHARAD is an abbreviation of
+// Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
+static const int32_t BAHARAD = 11*HOUR_PARTS + 204;
+
+/**
+* Finds the day # of the first day in the given Hebrew year.
+* To do this, we want to calculate the time of the Tishri 1 new moon
+* in that year.
+* <p>
+* The algorithm here is similar to ones described in a number of
+* references, including:
+* <ul>
+* <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
+*     Cambridge University Press, 1997, pages 85-91.
+*
+* <li>Hebrew Calendar Science and Myths,
+*     <a href="http://www.geocities.com/Athens/1584/">
+*     http://www.geocities.com/Athens/1584/</a>
+*
+* <li>The Calendar FAQ,
+*      <a href="http://www.faqs.org/faqs/calendars/faq/">
+*      http://www.faqs.org/faqs/calendars/faq/</a>
+* </ul>
+*/
+int32_t HebrewCalendar::startOfYear(int32_t year, UErrorCode &status)
+{
+    ucln_i18n_registerCleanup(UCLN_I18N_HEBREW_CALENDAR, calendar_hebrew_cleanup);
+    int32_t day = CalendarCache::get(&gCache, year, status);
+
+    if (day == 0) {
+        int32_t months = (235 * year - 234) / 19;           // # of months before year
+
+        int64_t frac = (int64_t)months * MONTH_FRACT + BAHARAD;  // Fractional part of day #
+        day  = months * 29 + (int32_t)(frac / DAY_PARTS);        // Whole # part of calculation
+        frac = frac % DAY_PARTS;                        // Time of day
+
+        int32_t wd = (day % 7);                        // Day of week (0 == Monday)
+
+        if (wd == 2 || wd == 4 || wd == 6) {
+            // If the 1st is on Sun, Wed, or Fri, postpone to the next day
+            day += 1;
+            wd = (day % 7);
+        }
+        if (wd == 1 && frac > 15*HOUR_PARTS+204 && !isLeapYear(year) ) {
+            // If the new moon falls after 3:11:20am (15h204p from the previous noon)
+            // on a Tuesday and it is not a leap year, postpone by 2 days.
+            // This prevents 356-day years.
+            day += 2;
+        }
+        else if (wd == 0 && frac > 21*HOUR_PARTS+589 && isLeapYear(year-1) ) {
+            // If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
+            // on a Monday and *last* year was a leap year, postpone by 1 day.
+            // Prevents 382-day years.
+            day += 1;
+        }
+        CalendarCache::put(&gCache, year, day, status);
+    }
+    return day;
+}
+
+/**
+* Find the day of the week for a given day
+*
+* @param day   The # of days since the start of the Hebrew calendar,
+*              1-based (i.e. 1/1/1 AM is day 1).
+*/
+int32_t HebrewCalendar::absoluteDayToDayOfWeek(int32_t day)
+{
+    // We know that 1/1/1 AM is a Monday, which makes the math easy...
+    return (day % 7) + 1;
+}
+
+/**
+* Returns the the type of a given year.
+*  0   "Deficient" year with 353 or 383 days
+*  1   "Normal"    year with 354 or 384 days
+*  2   "Complete"  year with 355 or 385 days
+*/
+int32_t HebrewCalendar::yearType(int32_t year) const
+{
+    int32_t yearLength = handleGetYearLength(year);
+
+    if (yearLength > 380) {
+        yearLength -= 30;        // Subtract length of leap month.
+    }
+
+    int type = 0;
+
+    switch (yearLength) {
+  case 353:
+      type = 0; break;
+  case 354:
+      type = 1; break;
+  case 355:
+      type = 2; break;
+  default:
+      //throw new RuntimeException("Illegal year length " + yearLength + " in year " + year);
+      type = 1;
+    }
+    return type;
+}
+
+/**
+* Determine whether a given Hebrew year is a leap year
+*
+* The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17.
+* The formula below performs the same test, believe it or not.
+*/
+UBool HebrewCalendar::isLeapYear(int32_t year) {
+    //return (year * 12 + 17) % 19 >= 12;
+    int32_t x = (year*12 + 17) % 19;
+    return x >= ((x < 0) ? -7 : 12);
+}
+
+int32_t HebrewCalendar::monthsInYear(int32_t year) {
+    return isLeapYear(year) ? 13 : 12;
+}
+
+//-------------------------------------------------------------------------
+// Calendar framework
+//-------------------------------------------------------------------------
+
+/**
+* @internal
+*/
+int32_t HebrewCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
+    return LIMITS[field][limitType];
+}
+
+/**
+* Returns the length of the given month in the given year
+* @internal
+*/
+int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
+    // Resolve out-of-range months.  This is necessary in order to
+    // obtain the correct year.  We correct to
+    // a 12- or 13-month year (add/subtract 12 or 13, depending
+    // on the year) but since we _always_ number from 0..12, and
+    // the leap year determines whether or not month 5 (Adar 1)
+    // is present, we allow 0..12 in any given year.
+    while (month < 0) {
+        month += monthsInYear(--extendedYear);
+    }
+    // Careful: allow 0..12 in all years
+    while (month > 12) {
+        month -= monthsInYear(extendedYear++);
+    }
+
+    switch (month) {
+    case HESHVAN:
+    case KISLEV:
+      // These two month lengths can vary
+      return MONTH_LENGTH[month][yearType(extendedYear)];
+
+    default:
+      // The rest are a fixed length
+      return MONTH_LENGTH[month][0];
+    }
+}
+
+/**
+* Returns the number of days in the given Hebrew year
+* @internal
+*/
+int32_t HebrewCalendar::handleGetYearLength(int32_t eyear) const {
+    UErrorCode status = U_ZERO_ERROR;
+    return startOfYear(eyear+1, status) - startOfYear(eyear, status);
+}
+
+//-------------------------------------------------------------------------
+// Functions for converting from milliseconds to field values
+//-------------------------------------------------------------------------
+
+/**
+* Subclasses may override this method to compute several fields
+* specific to each calendar system.  These are:
+*
+* <ul><li>ERA
+* <li>YEAR
+* <li>MONTH
+* <li>DAY_OF_MONTH
+* <li>DAY_OF_YEAR
+* <li>EXTENDED_YEAR</ul>
+* 
+* Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields,
+* which will be set when this method is called.  Subclasses can
+* also call the getGregorianXxx() methods to obtain Gregorian
+* calendar equivalents for the given Julian day.
+*
+* <p>In addition, subclasses should compute any subclass-specific
+* fields, that is, fields from BASE_FIELD_COUNT to
+* getFieldCount() - 1.
+* @internal
+*/
+void HebrewCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
+    int32_t d = julianDay - 347997;
+    double m = ((d * (double)DAY_PARTS)/ (double) MONTH_PARTS);         // Months (approx)
+    int32_t year = (int32_t)( ((19. * m + 234.) / 235.) + 1.);     // Years (approx)
+    int32_t ys  = startOfYear(year, status);                   // 1st day of year
+    int32_t dayOfYear = (d - ys);
+
+    // Because of the postponement rules, it's possible to guess wrong.  Fix it.
+    while (dayOfYear < 1) {
+        year--;
+        ys  = startOfYear(year, status);
+        dayOfYear = (d - ys);
+    }
+
+    // Now figure out which month we're in, and the date within that month
+    int32_t type = yearType(year);
+    UBool isLeap = isLeapYear(year);
+
+    int32_t month = 0;
+    int32_t momax = sizeof(MONTH_START) / (3 * sizeof(MONTH_START[0][0]));
+    while (month < momax && dayOfYear > (  isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type] ) ) {
+        month++;
+    }
+    if (month >= momax || month<=0) {
+        // TODO: I found dayOfYear could be out of range when
+        // a large value is set to julianDay.  I patched startOfYear
+        // to reduce the chace, but it could be still reproduced either
+        // by startOfYear or other places.  For now, we check
+        // the month is in valid range to avoid out of array index
+        // access problem here.  However, we need to carefully review
+        // the calendar implementation to check the extreme limit of
+        // each calendar field and the code works well for any values
+        // in the valid value range.  -yoshito
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+    month--;
+    int dayOfMonth = dayOfYear - (isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type]);
+
+    internalSet(UCAL_ERA, 0);
+    internalSet(UCAL_YEAR, year);
+    internalSet(UCAL_EXTENDED_YEAR, year);
+    internalSet(UCAL_MONTH, month);
+    internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
+    internalSet(UCAL_DAY_OF_YEAR, dayOfYear);       
+}
+
+//-------------------------------------------------------------------------
+// Functions for converting from field values to milliseconds
+//-------------------------------------------------------------------------
+
+/**
+* @internal
+*/
+int32_t HebrewCalendar::handleGetExtendedYear() {
+    int32_t year;
+    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
+        year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
+    } else {
+        year = internalGet(UCAL_YEAR, 1); // Default to year 1
+    }
+    return year;
+}
+
+/**
+* Return JD of start of given month/year.
+* @internal
+*/
+int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
+    UErrorCode status = U_ZERO_ERROR;
+    // Resolve out-of-range months.  This is necessary in order to
+    // obtain the correct year.  We correct to
+    // a 12- or 13-month year (add/subtract 12 or 13, depending
+    // on the year) but since we _always_ number from 0..12, and
+    // the leap year determines whether or not month 5 (Adar 1)
+    // is present, we allow 0..12 in any given year.
+    while (month < 0) {
+        month += monthsInYear(--eyear);
+    }
+    // Careful: allow 0..12 in all years
+    while (month > 12) {
+        month -= monthsInYear(eyear++);
+    }
+
+    int32_t day = startOfYear(eyear, status);
+
+    if(U_FAILURE(status)) {
+        return 0;
+    }
+
+    if (month != 0) {
+        if (isLeapYear(eyear)) {
+            day += LEAP_MONTH_START[month][yearType(eyear)];
+        } else {
+            day += MONTH_START[month][yearType(eyear)];
+        }
+    }
+
+    return (int) (day + 347997);
+}
+
+UBool
+HebrewCalendar::inDaylightTime(UErrorCode& status) const
+{
+    // copied from GregorianCalendar
+    if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) 
+        return FALSE;
+
+    // Force an update of the state of the Calendar.
+    ((HebrewCalendar*)this)->complete(status); // cast away const
+
+    return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
+}
+
+// default century
+const UDate     HebrewCalendar::fgSystemDefaultCentury        = DBL_MIN;
+const int32_t   HebrewCalendar::fgSystemDefaultCenturyYear    = -1;
+
+UDate           HebrewCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
+int32_t         HebrewCalendar::fgSystemDefaultCenturyStartYear   = -1;
+
+
+UBool HebrewCalendar::haveDefaultCentury() const
+{
+    return TRUE;
+}
+
+UDate HebrewCalendar::defaultCenturyStart() const
+{
+    return internalGetDefaultCenturyStart();
+}
+
+int32_t HebrewCalendar::defaultCenturyStartYear() const
+{
+    return internalGetDefaultCenturyStartYear();
+}
+
+UDate
+HebrewCalendar::internalGetDefaultCenturyStart() const
+{
+    // lazy-evaluate systemDefaultCenturyStart
+    UBool needsUpdate;
+    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStart
+
+    return fgSystemDefaultCenturyStart;
+}
+
+int32_t
+HebrewCalendar::internalGetDefaultCenturyStartYear() const
+{
+    // lazy-evaluate systemDefaultCenturyStartYear
+    UBool needsUpdate;
+    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+    if (needsUpdate) {
+        initializeSystemDefaultCentury();
+    }
+
+    // use defaultCenturyStart unless it's the flag value;
+    // then use systemDefaultCenturyStartYear
+
+    return fgSystemDefaultCenturyStartYear;
+}
+
+void
+HebrewCalendar::initializeSystemDefaultCentury()
+{
+    // initialize systemDefaultCentury and systemDefaultCenturyYear based
+    // on the current time.  They'll be set to 80 years before
+    // the current time.
+    UErrorCode status = U_ZERO_ERROR;
+    HebrewCalendar calendar(Locale("@calendar=hebrew"),status);
+    if (U_SUCCESS(status))
+    {
+        calendar.setTime(Calendar::getNow(), status);
+        calendar.add(UCAL_YEAR, -80, status);
+        UDate    newStart =  calendar.getTime(status);
+        int32_t  newYear  =  calendar.get(UCAL_YEAR, status);
+        umtx_lock(NULL);
+        if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
+            fgSystemDefaultCenturyStartYear = newYear;
+            fgSystemDefaultCenturyStart = newStart;
+        }
+        umtx_unlock(NULL);
+    }
+    // We have no recourse upon failure unless we want to propagate the failure
+    // out.
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HebrewCalendar)
+
+U_NAMESPACE_END
+
+#endif // UCONFIG_NO_FORMATTING
+