Use tools::Time::GetClock() to obtain hour,minute,second

... instead of rtl::math::approxFloor(fValue*DATE_TIME_FACTOR+0.5)
seconds that most times works but sometimes not.

Change-Id: Iaca69630461f2067622898fab35cda61d20172a9
Reviewed-on: https://gerrit.libreoffice.org/59719Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins

sc/source/core/data/dpgroup.cxx

@@ -169,31 +169,29 @@ bool ScDPGroupDateFilter::match( const ScDPItemData & rCellData ) const
             nGroupType == DataPilotFieldGroupBy::SECONDS)
         {
             // handle time
-            // (as in the cell functions, ScInterpreter::ScGetHour etc.: seconds are rounded)
+            // (do as in the cell functions, ScInterpreter::ScGetHour() etc.)
 
-            double time = rCellData.GetValue() - approxFloor(rCellData.GetValue());
-            long seconds = static_cast<long>(approxFloor(time*DATE_TIME_FACTOR + 0.5));
+            sal_uInt16 nHour, nMinute, nSecond;
+            double fFractionOfSecond;
+            tools::Time::GetClock( rCellData.GetValue(), nHour, nMinute, nSecond, fFractionOfSecond, 0);
 
             switch (nGroupType)
             {
                 case DataPilotFieldGroupBy::HOURS:
                 {
-                    sal_Int32 hrs = seconds / 3600;
-                    if (hrs == nValue)
+                    if (nHour == nValue)
                         return true;
                 }
                 break;
                 case DataPilotFieldGroupBy::MINUTES:
                 {
-                    sal_Int32 minutes = (seconds % 3600) / 60;
-                    if (minutes == nValue)
+                    if (nMinute == nValue)
                         return true;
                 }
                 break;
                 case DataPilotFieldGroupBy::SECONDS:
                 {
-                    sal_Int32 sec = seconds % 60;
-                    if (sec == nValue)
+                    if (nSecond == nValue)
                         return true;
                 }
                 break;

sc/source/core/data/dputil.cxx

@@ -314,21 +314,22 @@ sal_Int32 ScDPUtil::getDatePartValue(
         nDatePart == sheet::DataPilotFieldGroupBy::SECONDS)
     {
         // handle time
-        // (as in the cell functions, ScInterpreter::ScGetHour etc.: seconds are rounded)
+        // (do as in the cell functions, ScInterpreter::ScGetHour() etc.)
 
-        double fTime = fValue - rtl::math::approxFloor(fValue);
-        long nSeconds = static_cast<long>(rtl::math::approxFloor(fTime*DATE_TIME_FACTOR+0.5));
+        sal_uInt16 nHour, nMinute, nSecond;
+        double fFractionOfSecond;
+        tools::Time::GetClock( fValue, nHour, nMinute, nSecond, fFractionOfSecond, 0);
 
         switch (nDatePart)
         {
             case sheet::DataPilotFieldGroupBy::HOURS:
-                nResult = nSeconds / 3600;
+                nResult = nHour;
                 break;
             case sheet::DataPilotFieldGroupBy::MINUTES:
-                nResult = ( nSeconds % 3600 ) / 60;
+                nResult = nMinute;
                 break;
             case sheet::DataPilotFieldGroupBy::SECONDS:
-                nResult = nSeconds % 60;
+                nResult = nSecond;
                 break;
         }
     }