Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 974 insertions, 0 deletions

diff --git a/scaddins/source/datefunc/date.component b/scaddins/source/datefunc/date.component
new file mode 100644
index 000000000..7337d98c9
--- /dev/null
+++ b/scaddins/source/datefunc/date.component
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ -->
+
+<component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
+    xmlns="http://openoffice.org/2010/uno-components">
+  <implementation name="com.sun.star.sheet.addin.DateFunctionsImpl"
+    constructor="scaddins_ScaDateAddIn_get_implementation" single-instance="true">
+    <service name="com.sun.star.sheet.AddIn"/>
+    <service name="com.sun.star.sheet.addin.DateFunctions"/>
+  </implementation>
+</component>
diff --git a/scaddins/source/datefunc/datefunc.cxx b/scaddins/source/datefunc/datefunc.cxx
new file mode 100644
index 000000000..92492b29d
--- /dev/null
+++ b/scaddins/source/datefunc/datefunc.cxx
@@ -0,0 +1,688 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "datefunc.hxx"
+#include <datefunc.hrc>
+#include <strings.hrc>
+#include <com/sun/star/util/Date.hpp>
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <cppuhelper/weak.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <unotools/resmgr.hxx>
+#include <i18nlangtag/languagetag.hxx>
+#include <algorithm>
+#include <cmath>
+#include "deffuncname.hxx"
+
+using namespace ::com::sun::star;
+
+constexpr OUStringLiteral ADDIN_SERVICE = u"com.sun.star.sheet.AddIn";
+constexpr OUStringLiteral MY_SERVICE = u"com.sun.star.sheet.addin.DateFunctions";
+constexpr OUStringLiteral MY_IMPLNAME = u"com.sun.star.sheet.addin.DateFunctionsImpl";
+
+#define UNIQUE              false   // function name does not exist in Calc
+
+#define STDPAR              false   // all parameters are described
+#define INTPAR              true    // first parameter is internal
+
+#define FUNCDATA( FuncName, ParamCount, Category, Double, IntPar )  \
+    { "get" #FuncName, DATE_FUNCNAME_##FuncName, DATE_FUNCDESC_##FuncName, DATE_DEFFUNCNAME_##FuncName, ParamCount, Category, Double, IntPar }
+
+const ScaFuncDataBase pFuncDataArr[] =
+{
+    FUNCDATA( DiffWeeks,    3, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( DiffMonths,   3, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( DiffYears,    3, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( IsLeapYear,   1, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( DaysInMonth,  1, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( DaysInYear,   1, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( WeeksInYear,  1, ScaCategory::DateTime, UNIQUE, INTPAR ),
+    FUNCDATA( Rot13,        1, ScaCategory::Text,     UNIQUE, STDPAR )
+};
+
+#undef FUNCDATA
+
+ScaFuncData::ScaFuncData(const ScaFuncDataBase& rBaseData) :
+    aIntName( OUString::createFromAscii( rBaseData.pIntName ) ),
+    pUINameID( rBaseData.pUINameID ),
+    pDescrID( rBaseData.pDescrID ),
+    nParamCount( rBaseData.nParamCount ),
+    eCat( rBaseData.eCat ),
+    bDouble( rBaseData.bDouble ),
+    bWithOpt( rBaseData.bWithOpt )
+{
+    aCompList.push_back(OUString::createFromAscii(rBaseData.pCompListID[0]));
+    aCompList.push_back(OUString::createFromAscii(rBaseData.pCompListID[1]));
+}
+
+sal_uInt16 ScaFuncData::GetStrIndex( sal_uInt16 nParam ) const
+{
+    if( !bWithOpt )
+        nParam++;
+    return (nParam > nParamCount) ? (nParamCount * 2) : (nParam * 2);
+}
+
+static void InitScaFuncDataList(ScaFuncDataList& rList)
+{
+    for (const auto & nIndex : pFuncDataArr)
+        rList.push_back(ScaFuncData(nIndex));
+}
+
+//  entry points for service registration / instantiation
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+scaddins_ScaDateAddIn_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new ScaDateAddIn());
+}
+
+
+//  "normal" service implementation
+ScaDateAddIn::ScaDateAddIn()
+{
+}
+
+static const char*  pLang[] = { "de", "en" };
+static const char*  pCoun[] = { "DE", "US" };
+const sal_uInt32 nNumOfLoc = SAL_N_ELEMENTS( pLang );
+
+void ScaDateAddIn::InitDefLocales()
+{
+    pDefLocales.reset(new lang::Locale[ nNumOfLoc ]);
+
+    for( sal_uInt32 nIndex = 0; nIndex < nNumOfLoc; nIndex++ )
+    {
+        pDefLocales[ nIndex ].Language = OUString::createFromAscii( pLang[ nIndex ] );
+        pDefLocales[ nIndex ].Country = OUString::createFromAscii( pCoun[ nIndex ] );
+    }
+}
+
+const lang::Locale& ScaDateAddIn::GetLocale( sal_uInt32 nIndex )
+{
+    if( !pDefLocales )
+        InitDefLocales();
+
+    return (nIndex < nNumOfLoc) ? pDefLocales[ nIndex ] : aFuncLoc;
+}
+
+void ScaDateAddIn::InitData()
+{
+    aResLocale = Translate::Create("sca", LanguageTag(aFuncLoc));
+    pFuncDataList.reset();
+
+    pFuncDataList.reset(new ScaFuncDataList);
+    InitScaFuncDataList(*pFuncDataList);
+
+    if( pDefLocales )
+    {
+        pDefLocales.reset();
+    }
+}
+
+OUString ScaDateAddIn::GetFuncDescrStr(const TranslateId* pResId, sal_uInt16 nStrIndex)
+{
+    return ScaResId(pResId[nStrIndex - 1]);
+}
+
+// XServiceName
+OUString SAL_CALL ScaDateAddIn::getServiceName()
+{
+    // name of specific AddIn service
+    return MY_SERVICE;
+}
+
+// XServiceInfo
+OUString SAL_CALL ScaDateAddIn::getImplementationName()
+{
+    return MY_IMPLNAME;
+}
+
+sal_Bool SAL_CALL ScaDateAddIn::supportsService( const OUString& aServiceName )
+{
+    return cppu::supportsService(this, aServiceName);
+}
+
+uno::Sequence< OUString > SAL_CALL ScaDateAddIn::getSupportedServiceNames()
+{
+    return { ADDIN_SERVICE, MY_SERVICE };
+}
+
+// XLocalizable
+void SAL_CALL ScaDateAddIn::setLocale( const lang::Locale& eLocale )
+{
+    aFuncLoc = eLocale;
+    InitData();     // change of locale invalidates resources!
+}
+
+lang::Locale SAL_CALL ScaDateAddIn::getLocale()
+{
+    return aFuncLoc;
+}
+
+OUString SAL_CALL ScaDateAddIn::getProgrammaticFuntionName( const OUString& )
+{
+    //  not used by calc
+    //  (but should be implemented for other uses of the AddIn service)
+    return OUString();
+}
+
+OUString SAL_CALL ScaDateAddIn::getDisplayFunctionName( const OUString& aProgrammaticName )
+{
+    OUString aRet;
+
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt != pFuncDataList->end() )
+    {
+        aRet = ScaResId(fDataIt->GetUINameID());
+        if( fDataIt->IsDouble() )
+            aRet += "_ADD";
+    }
+    else
+    {
+        aRet = "UNKNOWNFUNC_" + aProgrammaticName;
+    }
+
+    return aRet;
+}
+
+OUString SAL_CALL ScaDateAddIn::getFunctionDescription( const OUString& aProgrammaticName )
+{
+    OUString aRet;
+
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt != pFuncDataList->end() )
+        aRet = GetFuncDescrStr( fDataIt->GetDescrID(), 1 );
+
+    return aRet;
+}
+
+OUString SAL_CALL ScaDateAddIn::getDisplayArgumentName(
+        const OUString& aProgrammaticName, sal_Int32 nArgument )
+{
+    OUString aRet;
+
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt != pFuncDataList->end() && (nArgument <= 0xFFFF) )
+    {
+        sal_uInt16 nStr = fDataIt->GetStrIndex( static_cast< sal_uInt16 >( nArgument ) );
+        if( nStr )
+            aRet = GetFuncDescrStr( fDataIt->GetDescrID(), nStr );
+        else
+            aRet = "internal";
+    }
+
+    return aRet;
+}
+
+OUString SAL_CALL ScaDateAddIn::getArgumentDescription(
+        const OUString& aProgrammaticName, sal_Int32 nArgument )
+{
+    OUString aRet;
+
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt != pFuncDataList->end() && (nArgument <= 0xFFFF) )
+    {
+        sal_uInt16 nStr = fDataIt->GetStrIndex( static_cast< sal_uInt16 >( nArgument ) );
+        if( nStr )
+            aRet = GetFuncDescrStr( fDataIt->GetDescrID(), nStr + 1 );
+        else
+            aRet = "for internal use only";
+    }
+
+    return aRet;
+}
+
+OUString SAL_CALL ScaDateAddIn::getProgrammaticCategoryName(
+        const OUString& aProgrammaticName )
+{
+    OUString aRet;
+
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt != pFuncDataList->end() )
+    {
+        switch( fDataIt->GetCategory() )
+        {
+            case ScaCategory::DateTime:   aRet = "Date&Time";    break;
+            case ScaCategory::Text:       aRet = "Text";         break;
+            case ScaCategory::Finance:    aRet = "Financial";    break;
+            case ScaCategory::Inf:        aRet = "Information";  break;
+            case ScaCategory::Math:       aRet = "Mathematical"; break;
+            case ScaCategory::Tech:       aRet = "Technical";    break;
+        }
+    }
+
+    if( aRet.isEmpty() )
+        aRet = "Add-In";
+    return aRet;
+}
+
+OUString SAL_CALL ScaDateAddIn::getDisplayCategoryName(
+        const OUString& aProgrammaticName )
+{
+    return getProgrammaticCategoryName( aProgrammaticName );
+}
+
+// XCompatibilityNames
+uno::Sequence< sheet::LocalizedName > SAL_CALL ScaDateAddIn::getCompatibilityNames(
+        const OUString& aProgrammaticName )
+{
+    auto fDataIt = std::find_if(pFuncDataList->begin(), pFuncDataList->end(),
+                                FindScaFuncData( aProgrammaticName ) );
+    if( fDataIt == pFuncDataList->end() )
+        return uno::Sequence< sheet::LocalizedName >( 0 );
+
+    const std::vector<OUString>& rStrList = fDataIt->GetCompNameList();
+    sal_uInt32 nCount = rStrList.size();
+
+    uno::Sequence< sheet::LocalizedName > aRet( nCount );
+    sheet::LocalizedName* pArray = aRet.getArray();
+
+    for( sal_uInt32 nIndex = 0; nIndex < nCount; nIndex++ )
+        pArray[ nIndex ] = sheet::LocalizedName( GetLocale( nIndex ), rStrList.at( nIndex ) );
+
+    return aRet;
+}
+
+namespace {
+
+// auxiliary functions
+bool IsLeapYear( sal_uInt16 nYear )
+{
+    return ((((nYear % 4) == 0) && ((nYear % 100) != 0)) || ((nYear % 400) == 0));
+}
+
+sal_uInt16 DaysInMonth( sal_uInt16 nMonth, sal_uInt16 nYear )
+{
+    static const sal_uInt16 aDaysInMonth[12] = { 31, 28, 31, 30, 31, 30,
+                                        31, 31, 30, 31, 30, 31 };
+
+    if ( nMonth != 2 )
+        return aDaysInMonth[nMonth-1];
+    else
+    {
+        if ( IsLeapYear(nYear) )
+            return aDaysInMonth[nMonth-1] + 1;
+        else
+            return aDaysInMonth[nMonth-1];
+    }
+}
+
+/**
+ * Convert a date to a count of days starting from 01/01/0001
+ *
+ * The internal representation of a Date used in this Addin
+ * is the number of days between 01/01/0001 and the date
+ * this function converts a Day , Month, Year representation
+ * to this internal Date value.
+ */
+
+sal_Int32 DateToDays( sal_uInt16 nDay, sal_uInt16 nMonth, sal_uInt16 nYear )
+{
+    sal_Int32 nDays = (static_cast<sal_Int32>(nYear)-1) * 365;
+    nDays += ((nYear-1) / 4) - ((nYear-1) / 100) + ((nYear-1) / 400);
+
+    for( sal_uInt16 i = 1; i < nMonth; i++ )
+        nDays += DaysInMonth(i,nYear);
+    nDays += nDay;
+
+    return nDays;
+}
+
+/**
+ * Convert a count of days starting from 01/01/0001 to a date
+ *
+ * The internal representation of a Date used in this Addin
+ * is the number of days between 01/01/0001 and the date
+ * this function converts this internal Date value
+ * to a Day , Month, Year representation of a Date.
+ *
+ * @throws lang::IllegalArgumentException
+ */
+
+void DaysToDate( sal_Int32 nDays,
+                sal_uInt16& rDay, sal_uInt16& rMonth, sal_uInt16& rYear )
+{
+    if( nDays < 0 )
+        throw lang::IllegalArgumentException();
+
+    sal_Int32   nTempDays;
+    sal_Int32   i = 0;
+    bool    bCalc;
+
+    do
+    {
+        nTempDays = nDays;
+        rYear = static_cast<sal_uInt16>((nTempDays / 365) - i);
+        nTempDays -= (static_cast<sal_Int32>(rYear) -1) * 365;
+        nTempDays -= (( rYear -1) / 4) - (( rYear -1) / 100) + ((rYear -1) / 400);
+        bCalc = false;
+        if ( nTempDays < 1 )
+        {
+            i++;
+            bCalc = true;
+        }
+        else
+        {
+            if ( nTempDays > 365 )
+            {
+                if ( (nTempDays != 366) || !IsLeapYear( rYear ) )
+                {
+                    i--;
+                    bCalc = true;
+                }
+            }
+        }
+    }
+    while ( bCalc );
+
+    rMonth = 1;
+    while ( nTempDays > DaysInMonth( rMonth, rYear ) )
+    {
+        nTempDays -= DaysInMonth( rMonth, rYear );
+        rMonth++;
+    }
+    rDay = static_cast<sal_uInt16>(nTempDays);
+}
+
+/**
+ * Get the null date used by the spreadsheet document
+ *
+ * The internal representation of a Date used in this Addin
+ * is the number of days between 01/01/0001 and the date
+ * this function returns this internal Date value for the document null date
+ *
+ * @throws uno::RuntimeException
+ */
+sal_Int32 GetNullDate( const uno::Reference< beans::XPropertySet >& xOptions )
+{
+    if (xOptions.is())
+    {
+        try
+        {
+            uno::Any aAny = xOptions->getPropertyValue( "NullDate" );
+            util::Date aDate;
+            if ( aAny >>= aDate )
+                return DateToDays( aDate.Day, aDate.Month, aDate.Year );
+        }
+        catch (uno::Exception&)
+        {
+        }
+    }
+
+    // no null date available -> no calculations possible
+    throw uno::RuntimeException();
+}
+
+}
+// XDateFunctions
+
+/**
+ * Get week difference between 2 dates
+ *
+ * new Weeks(date1,date2,mode) function for StarCalc
+ *
+ * Two modes of operation are provided.
+ * mode 0 is just a simple division by 7 calculation.
+ *
+ * mode 1 calculates the difference by week adhering to ISO8601.
+ *
+ * The International Standard IS-8601 states that Monday is the first
+ * day of the week. The Gregorian Calendar is used for all dates,
+ * proleptic in case of dates before 1582-10-15.
+ *
+ * The (consecutive) week number of a date is
+ * std::floor( (date + NullDate - 1), 7.0 ),
+ * with weeks starting on Monday, and week 0
+ * starting on Monday, 0001-01-01 Gregorian.
+ *
+ * Weeks(d2,d1,m) is defined as -Weeks(d1,d2,m).
+ *
+ */
+
+sal_Int32 SAL_CALL ScaDateAddIn::getDiffWeeks(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nStartDate, sal_Int32 nEndDate,
+        sal_Int32 nMode )
+{
+    if ( nMode  == 0 )
+    {
+        return ( nEndDate - nStartDate ) / 7;
+    }
+    else if ( nMode == 1 )
+    {
+        sal_Int32 nNullDate = GetNullDate( xOptions );
+        sal_Int32 nDays1 = nStartDate + nNullDate - 1;
+        sal_Int32 nDays2 = nEndDate + nNullDate - 1;
+
+        return ( std::floor( nDays2 / 7.0 ) - std::floor( nDays1 / 7.0 ) );
+    }
+    else
+        throw lang::IllegalArgumentException();
+}
+
+/**
+ * Get month difference between 2 dates
+ * =Month(start, end, mode) Function for StarCalc
+ *
+ * two modes are provided
+ *
+ * mode 0 is the interval between the dates in month
+ *
+ * mode 1 is the difference in calendar month
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getDiffMonths(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nStartDate, sal_Int32 nEndDate,
+        sal_Int32 nMode )
+{
+    if (nMode != 0 && nMode != 1)
+        throw lang::IllegalArgumentException();
+
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+
+    sal_Int32 nDays1 = nStartDate + nNullDate;
+    sal_Int32 nDays2 = nEndDate + nNullDate;
+
+    sal_uInt16 nDay1,nMonth1,nYear1;
+    sal_uInt16 nDay2,nMonth2,nYear2;
+    DaysToDate(nDays1,nDay1,nMonth1,nYear1);
+    DaysToDate(nDays2,nDay2,nMonth2,nYear2);
+
+    sal_Int32 nRet = nMonth2 - nMonth1 + (nYear2 - nYear1) * 12;
+    if ( nMode == 1 || nDays1 == nDays2 ) return nRet;
+
+    if ( nDays1 < nDays2 )
+    {
+        if ( nDay1 > nDay2 )
+        {
+            nRet -= 1;
+        }
+    }
+    else
+    {
+        if ( nDay1 < nDay2 )
+        {
+            nRet += 1;
+        }
+    }
+
+    return nRet;
+}
+
+/**
+ * Get Year difference between 2 dates
+ *
+ * two modes are provided
+ *
+ * mode 0 is the interval between the dates in years
+ *
+ * mode 1 is the difference in calendar years
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getDiffYears(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nStartDate, sal_Int32 nEndDate,
+        sal_Int32 nMode )
+{
+    if (nMode != 0 && nMode != 1)
+        throw lang::IllegalArgumentException();
+
+    if ( nMode != 1 )
+        return getDiffMonths( xOptions, nStartDate, nEndDate, nMode ) / 12;
+
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+
+    sal_Int32 nDays1 = nStartDate + nNullDate;
+    sal_Int32 nDays2 = nEndDate + nNullDate;
+
+    sal_uInt16 nDay1,nMonth1,nYear1;
+    sal_uInt16 nDay2,nMonth2,nYear2;
+    DaysToDate(nDays1,nDay1,nMonth1,nYear1);
+    DaysToDate(nDays2,nDay2,nMonth2,nYear2);
+
+    return nYear2 - nYear1;
+}
+
+/**
+ * Check if a Date is in a leap year in the Gregorian calendar
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getIsLeapYear(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nDate )
+{
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+    sal_Int32 nDays = nDate + nNullDate;
+
+    sal_uInt16 nDay, nMonth, nYear;
+    DaysToDate(nDays,nDay,nMonth,nYear);
+
+    return static_cast<sal_Int32>(IsLeapYear(nYear));
+}
+
+/**
+ * Get the Number of Days in the month for a date
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getDaysInMonth(
+        const uno::Reference<beans::XPropertySet>& xOptions,
+        sal_Int32 nDate )
+{
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+    sal_Int32 nDays = nDate + nNullDate;
+
+    sal_uInt16 nDay, nMonth, nYear;
+    DaysToDate(nDays,nDay,nMonth,nYear);
+
+    return DaysInMonth( nMonth, nYear );
+}
+
+/**
+ * Get number of days in the year of a date specified
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getDaysInYear(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nDate )
+{
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+    sal_Int32 nDays = nDate + nNullDate;
+
+    sal_uInt16 nDay, nMonth, nYear;
+    DaysToDate(nDays,nDay,nMonth,nYear);
+
+    return ( IsLeapYear(nYear) ? 366 : 365 );
+}
+
+/**
+ * Get number of weeks in the year for a date
+ *
+ * Most years have 52 weeks, but years that start on a Thursday
+ * and leap years that start on a Wednesday have 53 weeks
+ *
+ * The International Standard IS-8601 has decreed that Monday
+ * shall be the first day of the week.
+ *
+ * A WeekDay can be calculated by subtracting 1 and calculating the rest of
+ * a division by 7 from the internal date representation
+ * which gives a 0 - 6 value for Monday - Sunday
+ *
+ * @see #IsLeapYear #WeekNumber
+ */
+sal_Int32 SAL_CALL ScaDateAddIn::getWeeksInYear(
+        const uno::Reference< beans::XPropertySet >& xOptions,
+        sal_Int32 nDate )
+{
+    sal_Int32 nNullDate = GetNullDate( xOptions );
+    sal_Int32 nDays = nDate + nNullDate;
+
+    sal_uInt16 nDay, nMonth, nYear;
+    DaysToDate(nDays,nDay,nMonth,nYear);
+
+    sal_Int32 nJan1WeekDay = ( DateToDays(1,1,nYear) - 1) % 7;
+
+    sal_Int32 nRet;
+    if ( nJan1WeekDay == 3 )        /* Thursday */
+        nRet = 53;
+    else if ( nJan1WeekDay == 2 )   /* Wednesday */
+        nRet = ( IsLeapYear(nYear) ? 53 : 52 );
+    else
+        nRet = 52;
+
+    return nRet;
+}
+
+/**
+ * Encrypt or decrypt a string using ROT13 algorithm
+ *
+ * This function rotates each character by 13 in the alphabet.
+ * Only the characters 'a' ... 'z' and 'A' ... 'Z' are modified.
+ */
+OUString SAL_CALL ScaDateAddIn::getRot13( const OUString& aSrcString )
+{
+    OUStringBuffer aBuffer( aSrcString );
+    for( sal_Int32 nIndex = 0; nIndex < aBuffer.getLength(); nIndex++ )
+    {
+        sal_Unicode cChar = aBuffer[nIndex];
+        if( (cChar >= 'a') && (cChar <= 'z'))
+        {
+            cChar += 13;
+            if (cChar > 'z')
+                cChar -= 26;
+        }
+        else if( (cChar >= 'A') && (cChar <= 'Z') )
+        {
+            cChar += 13;
+            if (cChar > 'Z')
+                cChar -= 26;
+        }
+        aBuffer[nIndex] = cChar;
+    }
+    return aBuffer.makeStringAndClear();
+}
+
+OUString ScaDateAddIn::ScaResId(TranslateId aId)
+{
+    return Translate::get(aId, aResLocale);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/scaddins/source/datefunc/datefunc.hxx b/scaddins/source/datefunc/datefunc.hxx
new file mode 100644
index 000000000..0dd6b5fa2
--- /dev/null
+++ b/scaddins/source/datefunc/datefunc.hxx
@@ -0,0 +1,189 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+// date functions add in
+
+#pragma once
+
+#include <vector>
+#include <memory>
+#include <com/sun/star/lang/XServiceName.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/sheet/XAddIn.hpp>
+#include <com/sun/star/sheet/XCompatibilityNames.hpp>
+#include <com/sun/star/sheet/addin/XDateFunctions.hpp>
+#include <com/sun/star/sheet/addin/XMiscFunctions.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <unotools/resmgr.hxx>
+
+namespace com::sun::star::lang { class XMultiServiceFactory; }
+
+enum class ScaCategory
+{
+    DateTime,
+    Text,
+    Finance,
+    Inf,
+    Math,
+    Tech
+};
+
+struct ScaFuncDataBase
+{
+    const char*                 pIntName;           // internal name (get***)
+    TranslateId                 pUINameID;          // resource ID to UI name
+    const TranslateId*          pDescrID;           // resource ID to description, parameter names and ~ description
+    const char**                pCompListID;        // list of valid names
+    sal_uInt16                  nParamCount;        // number of named / described parameters
+    ScaCategory                 eCat;               // function category
+    bool                        bDouble;            // name already exist in Calc
+    bool                        bWithOpt;           // first parameter is internal
+};
+
+class ScaFuncData final
+{
+private:
+    OUString                    aIntName;           // internal name (get***)
+    TranslateId                 pUINameID;          // resource ID to UI name
+    const TranslateId*          pDescrID;           // leads also to parameter descriptions!
+    sal_uInt16                  nParamCount;        // num of parameters
+    std::vector<OUString>       aCompList;          // list of all valid names
+    ScaCategory                 eCat;               // function category
+    bool                    bDouble;            // name already exist in Calc
+    bool                    bWithOpt;           // first parameter is internal
+
+public:
+                                ScaFuncData(const ScaFuncDataBase& rBaseData);
+
+    const TranslateId &  GetUINameID() const     { return pUINameID; }
+    const TranslateId*    GetDescrID() const      { return pDescrID; }
+    ScaCategory          GetCategory() const     { return eCat; }
+    bool                 IsDouble() const        { return bDouble; }
+
+    sal_uInt16                  GetStrIndex( sal_uInt16 nParam ) const;
+    bool                 Is( std::u16string_view rCompare ) const
+                                                    { return aIntName == rCompare; }
+
+    const std::vector<OUString>& GetCompNameList() const { return aCompList; }
+};
+
+typedef std::vector<ScaFuncData> ScaFuncDataList;
+
+// Predicate for use with std::find_if
+struct FindScaFuncData
+{
+    const OUString& m_rId;
+    explicit FindScaFuncData( const OUString& rId ) : m_rId(rId) {}
+    bool operator() ( ScaFuncData const & rCandidate ) const { return rCandidate.Is(m_rId); }
+};
+
+
+// THE AddIn class for date functions
+
+class ScaDateAddIn : public ::cppu::WeakImplHelper<
+                                css::sheet::XAddIn,
+                                css::sheet::XCompatibilityNames,
+                                css::sheet::addin::XDateFunctions,
+                                css::sheet::addin::XMiscFunctions,
+                                css::lang::XServiceName,
+                                css::lang::XServiceInfo >
+{
+private:
+    css::lang::Locale                          aFuncLoc;
+    std::unique_ptr< css::lang::Locale[] >     pDefLocales;
+    std::locale                                aResLocale;
+    std::unique_ptr< ScaFuncDataList >         pFuncDataList;
+
+
+    void                        InitDefLocales();
+    const css::lang::Locale& GetLocale( sal_uInt32 nIndex );
+    void                        InitData();
+
+    /// @throws css::uno::RuntimeException
+    OUString                    GetFuncDescrStr(const TranslateId* pResId, sal_uInt16 nStrIndex);
+
+public:
+                                ScaDateAddIn();
+
+    OUString ScaResId(TranslateId aId);
+
+                                // XAddIn
+    virtual OUString SAL_CALL getProgrammaticFuntionName( const OUString& aDisplayName ) override;
+    virtual OUString SAL_CALL getDisplayFunctionName( const OUString& aProgrammaticName ) override;
+    virtual OUString SAL_CALL getFunctionDescription( const OUString& aProgrammaticName ) override;
+    virtual OUString SAL_CALL getDisplayArgumentName( const OUString& aProgrammaticName, sal_Int32 nArgument ) override;
+    virtual OUString SAL_CALL getArgumentDescription( const OUString& aProgrammaticName, sal_Int32 nArgument ) override;
+    virtual OUString SAL_CALL getProgrammaticCategoryName( const OUString& aProgrammaticName ) override;
+    virtual OUString SAL_CALL getDisplayCategoryName( const OUString& aProgrammaticName ) override;
+
+                                // XCompatibilityNames
+    virtual css::uno::Sequence< css::sheet::LocalizedName > SAL_CALL getCompatibilityNames( const OUString& aProgrammaticName ) override;
+
+                                // XLocalizable
+    virtual void SAL_CALL       setLocale( const css::lang::Locale& eLocale ) override;
+    virtual css::lang::Locale SAL_CALL getLocale() override;
+
+                                // XServiceName
+    virtual OUString SAL_CALL getServiceName() override;
+
+                                // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL   supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    //  methods from own interfaces start here
+
+                                // XDateFunctions
+    virtual sal_Int32 SAL_CALL  getDiffWeeks(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nEndDate, sal_Int32 nStartDate,
+                                    sal_Int32 nMode ) override;
+
+    virtual sal_Int32 SAL_CALL  getDiffMonths(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nEndDate, sal_Int32 nStartDate,
+                                    sal_Int32 nMode ) override;
+
+    virtual sal_Int32 SAL_CALL  getDiffYears(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nEndDate, sal_Int32 nStartDate,
+                                    sal_Int32 nMode ) override;
+
+    virtual sal_Int32 SAL_CALL  getIsLeapYear(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nDate ) override;
+
+    virtual sal_Int32 SAL_CALL  getDaysInMonth(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nDate ) override;
+
+    virtual sal_Int32 SAL_CALL  getDaysInYear(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nDate ) override;
+
+    virtual sal_Int32 SAL_CALL  getWeeksInYear(
+                                    const css::uno::Reference< css::beans::XPropertySet >& xOptions,
+                                    sal_Int32 nDate ) override;
+
+                                // XMiscFunctions
+    virtual OUString SAL_CALL getRot13(
+                                    const OUString& aSrcText ) override;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/scaddins/source/datefunc/deffuncname.hxx b/scaddins/source/datefunc/deffuncname.hxx
new file mode 100644
index 000000000..493ef9393
--- /dev/null
+++ b/scaddins/source/datefunc/deffuncname.hxx
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+static const char* DATE_DEFFUNCNAME_DiffWeeks[2] =
+{
+    "WOCHEN",
+    "WEEKS"
+};
+
+static const char* DATE_DEFFUNCNAME_DiffMonths[2] =
+{
+    "MONATE",
+    "MONTHS"
+};
+
+static const char* DATE_DEFFUNCNAME_DiffYears[2] =
+{
+    "JAHRE",
+    "YEARS"
+};
+
+static const char* DATE_DEFFUNCNAME_IsLeapYear[2] =
+{
+    "ISTSCHALTJAHR",
+    "ISLEAPYEAR"
+};
+
+static const char* DATE_DEFFUNCNAME_DaysInMonth[2] =
+{
+    "TAGEIMMONAT",
+    "DAYSINMONTH"
+};
+
+static const char* DATE_DEFFUNCNAME_DaysInYear[2] =
+{
+    "TAGEIMJAHR",
+    "DAYSINYEAR"
+};
+
+static const char* DATE_DEFFUNCNAME_WeeksInYear[2] =
+{
+    "WOCHENIMJAHR",
+    "WEEKSINYEAR"
+};
+
+static const char* DATE_DEFFUNCNAME_Rot13[2] =
+{
+    "ROT13",
+    "ROT13"
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */