diff --git a/ApplicationCode/ProjectDataModel/Flow/RimWellPlotTools.cpp b/ApplicationCode/ProjectDataModel/Flow/RimWellPlotTools.cpp
index 85f8a4b882..b0e2206a84 100644
--- a/ApplicationCode/ProjectDataModel/Flow/RimWellPlotTools.cpp
+++ b/ApplicationCode/ProjectDataModel/Flow/RimWellPlotTools.cpp
@@ -19,6 +19,7 @@
 #include "RimWellPlotTools.h"
 
 #include "RiaApplication.h"
+#include "RiaQDateTimeTools.h"
 #include "RiaWellNameComparer.h"
 
 #include "RifReaderEclipseRft.h"
@@ -31,6 +32,7 @@
 #include "RimEclipseResultCase.h"
 #include "RimOilField.h"
 #include "RimProject.h"
+#include "RimTools.h"
 #include "RimWellLogExtractionCurve.h"
 #include "RimWellLogFile.h"
 #include "RimWellLogFileChannel.h"
@@ -39,7 +41,6 @@
 #include "RimWellPath.h"
 #include "RimWellPathCollection.h"
 
-#include "RimTools.h"
 #include <regex>
 
 //--------------------------------------------------------------------------------------------------
@@ -986,7 +987,8 @@ void RimWellPlotTools::calculateValueOptionsForTimeSteps(
 
     for (const std::pair<QDateTime, std::set<RifDataSourceForRftPlt>>& timeStepPair : timestepsToShowWithSources)
     {
-        QString optionText = timeStepPair.first.toString(dateFormatString);
+        QString optionText = RiaQDateTimeTools::toStringUsingApplicationLocale(timeStepPair.first, dateFormatString);
+
         bool    hasObs     = false;
         bool    hasRft     = false;
         bool    hasGrid    = false;
diff --git a/ApplicationCode/ProjectDataModel/Flow/RimWellPltPlot.cpp b/ApplicationCode/ProjectDataModel/Flow/RimWellPltPlot.cpp
index cfdf972cdb..cbe735d51c 100644
--- a/ApplicationCode/ProjectDataModel/Flow/RimWellPltPlot.cpp
+++ b/ApplicationCode/ProjectDataModel/Flow/RimWellPltPlot.cpp
@@ -21,6 +21,7 @@
 #include "RiaApplication.h"
 #include "RiaColorTables.h"
 #include "RiaDateStringParser.h"
+#include "RiaQDateTimeTools.h"
 #include "RiaWellNameComparer.h"
 
 #include "RifReaderEclipseRft.h"
@@ -528,7 +529,8 @@ void RimWellPltPlot::syncCurvesFromUiSelection()
             curveName += sourceDef.eclCase()     ? sourceDef.eclCase()->caseUserDescription() : "";
             curveName += sourceDef.wellLogFile() ? sourceDef.wellLogFile()->name() : "";
             if ( sourceDef.sourceType() == RifDataSourceForRftPlt::RFT ) curveName += ", RFT";
-            curveName += ", " + timeStep.toString(dateFormatString);
+
+            curveName += ", " + RiaQDateTimeTools::toStringUsingApplicationLocale(timeStep, dateFormatString);
         }
 
         RimEclipseResultCase* rimEclipseResultCase = dynamic_cast<RimEclipseResultCase*>(sourceDef.eclCase());
diff --git a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
index bc2b30589f..e2c43a8f1f 100644
--- a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
+++ b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
@@ -20,6 +20,8 @@
 
 #include "Rim3dOverlayInfoConfig.h"
 
+#include "RiaQDateTimeTools.h"
+
 #include "RicGridStatisticsDialog.h"
 
 #include "RigCaseCellResultsData.h"
@@ -899,9 +901,12 @@ QString Rim3dOverlayInfoConfig::timeStepText(RimEclipseView* eclipseView)
     if (currTimeStepIndex >= 0 && currTimeStepIndex < (int)timeSteps.size())
     {
         QString dateFormat = RimTools::createTimeFormatStringFromDates(timeSteps);
+
+        QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(timeSteps[currTimeStepIndex], dateFormat);
+
         dateTimeString = QString("Time Step: %1/%2  %3").arg(QString::number(currTimeStepIndex), 
                                                              QString::number(timeSteps.size() - 1),
-                                                             timeSteps[currTimeStepIndex].toString(dateFormat));
+                                                             dateString);
     }
 
     return QString("<p><b><center>-- %1 --</center></b>").arg(dateTimeString) +
diff --git a/ApplicationCode/ProjectDataModel/Rim3dWellLogRftCurve.cpp b/ApplicationCode/ProjectDataModel/Rim3dWellLogRftCurve.cpp
index b1a4380880..48e319403c 100644
--- a/ApplicationCode/ProjectDataModel/Rim3dWellLogRftCurve.cpp
+++ b/ApplicationCode/ProjectDataModel/Rim3dWellLogRftCurve.cpp
@@ -18,7 +18,10 @@
 
 #include "Rim3dWellLogRftCurve.h"
 
+#include "RiaQDateTimeTools.h"
+
 #include "RifReaderEclipseRft.h"
+
 #include "RigWellLogCurveData.h"
 
 #include "RimWellLogRftCurveNameConfig.h"
@@ -191,7 +194,9 @@ QList<caf::PdmOptionItemInfo> Rim3dWellLogRftCurve::calculateValueOptions(const
                 std::vector<QDateTime> timeStamps = reader->availableTimeSteps(wellName(), m_wellLogChannelName());
                 for (const QDateTime& dt : timeStamps)
                 {
-                    options.push_back(caf::PdmOptionItemInfo(dt.toString(dateFormat), dt));
+                    QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(dt, dateFormat);
+
+                    options.push_back(caf::PdmOptionItemInfo(dateString, dt));
                 }
             }
 
diff --git a/ApplicationCode/ProjectDataModel/RimEclipseCase.cpp b/ApplicationCode/ProjectDataModel/RimEclipseCase.cpp
index bc7c62f522..78fd512799 100644
--- a/ApplicationCode/ProjectDataModel/RimEclipseCase.cpp
+++ b/ApplicationCode/ProjectDataModel/RimEclipseCase.cpp
@@ -851,8 +851,10 @@ QString RimEclipseCase::timeStepName(int frameIdx) const
     if (frameIdx < static_cast<int>(timeStepDates.size()))
     {
         QDateTime date = timeStepDates.at(frameIdx);
-        return date.toString(m_timeStepFormatString);
+
+        return RiaQDateTimeTools::toStringUsingApplicationLocale(date, m_timeStepFormatString);
     }
+
     return QString("");
 }
 
diff --git a/ApplicationCode/ProjectDataModel/RimTimeStepFilter.cpp b/ApplicationCode/ProjectDataModel/RimTimeStepFilter.cpp
index 3d6529564d..eeeb6ce0a8 100644
--- a/ApplicationCode/ProjectDataModel/RimTimeStepFilter.cpp
+++ b/ApplicationCode/ProjectDataModel/RimTimeStepFilter.cpp
@@ -18,7 +18,10 @@
 
 #include "RimTimeStepFilter.h"
 
+#include "RiaQDateTimeTools.h"
+
 #include "RifReaderEclipseOutput.h"
+
 #include "RigCaseCellResultsData.h"
 
 #include "RimEclipseResultCase.h"
@@ -91,10 +94,13 @@ RimTimeStepFilter::RimTimeStepFilter()
 void RimTimeStepFilter::setTimeStepsFromFile(const std::vector<QDateTime>& timeSteps)
 {
     m_dateFormat = RimTools::createTimeFormatStringFromDates(timeSteps);
+    
     std::vector<QString> timeStepStrings;
     for (const QDateTime& date : timeSteps)
     {
-        timeStepStrings.push_back(date.toString(m_dateFormat));
+        QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(date, m_dateFormat);
+
+        timeStepStrings.push_back(dateString);
     }
 
     m_timeStepNamesFromFile = timeStepStrings;
@@ -128,7 +134,7 @@ void RimTimeStepFilter::setTimeStepsFromFile(const std::vector<std::pair<QString
         QString stepString = stringDatePair.first;
         if (stringDatePair.second.isValid())
         {
-            stepString = stringDatePair.second.toString(m_dateFormat);
+            stepString = RiaQDateTimeTools::toStringUsingApplicationLocale(stringDatePair.second, m_dateFormat);
         }
         timeStepStrings.push_back(stepString);
     }
diff --git a/ApplicationCode/ProjectDataModel/RimWellLogRftCurve.cpp b/ApplicationCode/ProjectDataModel/RimWellLogRftCurve.cpp
index c2c4861bd4..202dd0e0cd 100644
--- a/ApplicationCode/ProjectDataModel/RimWellLogRftCurve.cpp
+++ b/ApplicationCode/ProjectDataModel/RimWellLogRftCurve.cpp
@@ -21,6 +21,7 @@
 
 #include "RiaApplication.h"
 #include "RiaEclipseUnitTools.h"
+#include "RiaQDateTimeTools.h"
 #include "RiaSimWellBranchTools.h"
 
 #include "RifEclipseRftAddress.h"
@@ -430,7 +431,9 @@ QList<caf::PdmOptionItemInfo> RimWellLogRftCurve::calculateValueOptions(const ca
             std::vector<QDateTime> timeStamps = reader->availableTimeSteps(m_wellName, m_wellLogChannelName());
             for (const QDateTime& dt : timeStamps)
             {
-                options.push_back(caf::PdmOptionItemInfo(dt.toString(dateFormat), dt));
+                QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(dt, dateFormat);
+
+                options.push_back(caf::PdmOptionItemInfo(dateString, dt));
             }
         }
 
diff --git a/ApplicationCode/UserInterface/RiuQwtCurvePointTracker.cpp b/ApplicationCode/UserInterface/RiuQwtCurvePointTracker.cpp
index bb9c108bd4..d8a4922df8 100644
--- a/ApplicationCode/UserInterface/RiuQwtCurvePointTracker.cpp
+++ b/ApplicationCode/UserInterface/RiuQwtCurvePointTracker.cpp
@@ -18,6 +18,8 @@
 
 #include "RiuQwtCurvePointTracker.h"
 
+#include "RiaQDateTimeTools.h"
+
 #include "qwt_plot_marker.h"
 #include "qwt_symbol.h"
 
@@ -176,7 +178,9 @@ QPointF RiuQwtCurvePointTracker::closestCurvePoint(const QPoint& cursorPosition,
         if ( dateScaleDraw )
         {
             QDateTime date = dateScaleDraw->toDateTime(mainAxisSampleVal);
-            *mainAxisValueString = date.toString("hh:mm dd.MMMM.yyyy");
+            
+            QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(date, "hh:mm dd.MMMM.yyyy");
+            *mainAxisValueString = dateString;
         }
         else if ( mainAxisScaleDraw )
         {
diff --git a/ApplicationCode/UserInterface/RiuResultQwtPlot.cpp b/ApplicationCode/UserInterface/RiuResultQwtPlot.cpp
index 6ed8ef30eb..e844873ff4 100644
--- a/ApplicationCode/UserInterface/RiuResultQwtPlot.cpp
+++ b/ApplicationCode/UserInterface/RiuResultQwtPlot.cpp
@@ -20,6 +20,7 @@
 #include "RiuResultQwtPlot.h"
 
 #include "RiaCurveDataTools.h"
+#include "RiaQDateTimeTools.h"
 
 #include "RimContextCommandBuilder.h"
 #include "RimCase.h"
@@ -214,7 +215,10 @@ QString RiuResultQwtPlot::asciiDataForUiSelectedCurves() const
                 }
             }
             out += "\n";
-            out += m_timeSteps.at(caseId)[i].toString("yyyy-MM-dd hh:mm:ss ");
+
+            QString dateString = RiaQDateTimeTools::toStringUsingApplicationLocale(m_timeSteps.at(caseId)[i], "yyyy-MM-dd hh:mm:ss ");
+
+            out += dateString;
 
             for (size_t j = 0; j < m_curveData.at(caseId).size(); j++) // curves
             {