Resolves: tdf#100452 class Date full (BCE,CE) proleptic Gregorian calendar

... implementing signed years with year 0 gap.
Date(31,12,-1) last day BCE
Date(1,1,1) first day CE

New class Date member functions:
* AddYears(sal_Int16) to be used instead of
  aDate.SetYear(aDate.GetYear()+sal_Int16) to handle year 0 gap.
* convenience GetNextYear() to be used insted of GetYear()+1
* convenience GetPrevYear() to be used insted of GetYear()-1
* AddMonths(sal_Int32)
* operator=(const css::util::Date&)

New class DateTime member functions:
* operator=(const css::util::DateTime&)

Made some conversion ctors explicit, specifically Date(sal_Int32)

Adapted hopefully all places that used a sal_uInt16 year to use
sal_Int16 where appropriate.

Eliminated some quirks in date handling found on the fly.

Added era handling to i18npool icu calendar setting interface, which
missing was responsible for 0001-01-01 entered in Calc being set as
-0001-01-01, hence subtracting one day resulted in -0002-12-31.

Change-Id: I77b39fba9599ebd5067d7864f6c9ebe01f6f578f
Reviewed-on: https://gerrit.libreoffice.org/27049
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>

2 files changed, 16 insertions, 8 deletions

diff --git a/i18npool/inc/calendar_gregorian.hxx b/i18npool/inc/calendar_gregorian.hxx
index 4f333815a918..4a16c00c3eb6 100644
--- a/i18npool/inc/calendar_gregorian.hxx
+++ b/i18npool/inc/calendar_gregorian.hxx
@@ -116,9 +116,9 @@ private:
 
     /** Submit fieldSetValue array according to fieldSet. */
     void submitFields() throw(css::uno::RuntimeException);
-    /** Submit fieldSetValue array according to fieldSet, plus YMDhms if >=0,
+    /** Submit fieldSetValue array according to fieldSet, plus EYMDhms if >=0,
         plus zone and DST if != 0 */
-    void submitValues( sal_Int32 nYear, sal_Int32 nMonth, sal_Int32 nDay, sal_Int32 nHour, sal_Int32 nMinute, sal_Int32 nSecond, sal_Int32 nMilliSecond, sal_Int32 nZone, sal_Int32 nDST) throw(css::uno::RuntimeException);
+    void submitValues( sal_Int32 nEra, sal_Int32 nYear, sal_Int32 nMonth, sal_Int32 nDay, sal_Int32 nHour, sal_Int32 nMinute, sal_Int32 nSecond, sal_Int32 nMilliSecond, sal_Int32 nZone, sal_Int32 nDST) throw(css::uno::RuntimeException);
     /** Set fields internally. */
     void setValue() throw(css::uno::RuntimeException);
     /** Obtain combined field values for timezone offset (minutes+secondmillis)
diff --git a/i18npool/source/calendar/calendar_gregorian.cxx b/i18npool/source/calendar/calendar_gregorian.cxx
index fc470e109e8e..275b24dff0ed 100644
--- a/i18npool/source/calendar/calendar_gregorian.cxx
+++ b/i18npool/source/calendar/calendar_gregorian.cxx
@@ -491,12 +491,14 @@ void Calendar_gregorian::submitFields() throw(css::uno::RuntimeException)
         body->set( fieldNameConverter( CalendarFieldIndex::DST_OFFSET), nDSTOffset);
 }
 
-void Calendar_gregorian::submitValues( sal_Int32 nYear,
+void Calendar_gregorian::submitValues( sal_Int32 nEra, sal_Int32 nYear,
         sal_Int32 nMonth, sal_Int32 nDay, sal_Int32 nHour, sal_Int32 nMinute,
         sal_Int32 nSecond, sal_Int32 nMilliSecond, sal_Int32 nZone, sal_Int32 nDST )
             throw(css::uno::RuntimeException)
 {
     submitFields();
+    if (nEra >= 0)
+        body->set( UCAL_ERA, nEra);
     if (nYear >= 0)
         body->set( UCAL_YEAR, nYear);
     if (nMonth >= 0)
@@ -567,12 +569,18 @@ void Calendar_gregorian::setValue() throw(RuntimeException)
 
     bool bNeedZone = !(fieldSet & (1 << CalendarFieldIndex::ZONE_OFFSET));
     bool bNeedDST  = !(fieldSet & (1 << CalendarFieldIndex::DST_OFFSET));
-    sal_Int32 nZone1, nDST1, nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone0, nDST0;
+    sal_Int32 nZone1, nDST1, nEra, nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone0, nDST0;
     nZone1 = nDST1 = nZone0 = nDST0 = 0;
-    nYear = nMonth = nDay = nHour = nMinute = nSecond = nMilliSecond = -1;
+    nEra = nYear = nMonth = nDay = nHour = nMinute = nSecond = nMilliSecond = -1;
     if ( bNeedZone || bNeedDST )
     {
         UErrorCode status;
+        if ( !(fieldSet & (1 << CalendarFieldIndex::ERA)) )
+        {
+            nEra = body->get( UCAL_ERA, status = U_ZERO_ERROR);
+            if ( !U_SUCCESS(status) )
+                nEra = -1;
+        }
         if ( !(fieldSet & (1 << CalendarFieldIndex::YEAR)) )
         {
             nYear = body->get( UCAL_YEAR, status = U_ZERO_ERROR);
@@ -629,7 +637,7 @@ void Calendar_gregorian::setValue() throw(RuntimeException)
         }
 
         // Submit values to obtain a time zone and DST corresponding to the date/time.
-        submitValues( nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone0, nDST0);
+        submitValues( nEra, nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone0, nDST0);
 
         DUMP_ICU_CAL_MSG(("%s\n","setValue() in bNeedZone||bNeedDST after submitValues()"));
         DUMP_I18N_CAL_MSG(("%s\n","setValue() in bNeedZone||bNeedDST after submitValues()"));
@@ -680,7 +688,7 @@ void Calendar_gregorian::setValue() throw(RuntimeException)
                 lcl_setCombinedOffsetFieldValues( nDST2, fieldSetValue,
                         fieldValue, CalendarFieldIndex::DST_OFFSET,
                         CalendarFieldIndex::DST_OFFSET_SECOND_MILLIS);
-            submitValues( nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone2, nDST2);
+            submitValues( nEra, nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone2, nDST2);
             DUMP_ICU_CAL_MSG(("%s\n","setValue() after Zone/DST glitch resubmit"));
             DUMP_I18N_CAL_MSG(("%s\n","setValue() after Zone/DST glitch resubmit"));
 
@@ -726,7 +734,7 @@ void Calendar_gregorian::setValue() throw(RuntimeException)
             }
             if (bResubmit)
             {
-                submitValues( nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone3, nDST3);
+                submitValues( nEra, nYear, nMonth, nDay, nHour, nMinute, nSecond, nMilliSecond, nZone3, nDST3);
                 DUMP_ICU_CAL_MSG(("%s\n","setValue() after Zone/DST glitch 2nd resubmit"));
                 DUMP_I18N_CAL_MSG(("%s\n","setValue() after Zone/DST glitch 2nd resubmit"));
             }