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>

1 files changed, 2 insertions, 2 deletions

diff --git a/sc/inc/docoptio.hxx b/sc/inc/docoptio.hxx
index a5f3bbfdc298..529135bb9a37 100644
--- a/sc/inc/docoptio.hxx
+++ b/sc/inc/docoptio.hxx
@@ -73,9 +73,9 @@ public:
     double GetIterEps() const               { return fIterEps; }
     void   SetIterEps( double fEps )        { fIterEps = fEps; }
 
-    void   GetDate( sal_uInt16& rD, sal_uInt16& rM, sal_uInt16& rY ) const
+    void   GetDate( sal_uInt16& rD, sal_uInt16& rM, sal_Int16& rY ) const
                                         { rD = nDay; rM = nMonth; rY = nYear;}
-    void   SetDate (sal_uInt16 nD, sal_uInt16 nM, sal_uInt16 nY)
+    void   SetDate (sal_uInt16 nD, sal_uInt16 nM, sal_Int16 nY)
                                         { nDay = nD; nMonth = nM; nYear = nY; }
     sal_uInt16 GetTabDistance() const { return nTabDistance;}
     void   SetTabDistance( sal_uInt16 nTabDist ) {nTabDistance = nTabDist;}