diff --git a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.cpp b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.cpp
index 3a5ee2b187..bb4e51cf85 100644
--- a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.cpp
+++ b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.cpp
@@ -445,6 +445,16 @@ RifEclipseSummaryAddress RifEclipseSummaryAddress::ensembleStatisticsAddress( co
     return addr;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RifEclipseSummaryAddress RifEclipseSummaryAddress::timeAddress()
+{
+    RifEclipseSummaryAddress addr;
+    addr.m_variableCategory = SummaryVarCategory::SUMMARY_TIME;
+    return addr;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -1241,6 +1251,14 @@ bool RifEclipseSummaryAddress::isCalculated() const
     return m_id != -1;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+bool RifEclipseSummaryAddress::isTime() const
+{
+    return m_variableCategory == SummaryVarCategory::SUMMARY_TIME;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.h b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.h
index af064c79bd..e8a3bcb545 100644
--- a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.h
+++ b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddress.h
@@ -89,6 +89,9 @@ public:
     static RifEclipseSummaryAddress importedAddress( const std::string& vectorName, int calculationId = -1 );
     static RifEclipseSummaryAddress ensembleStatisticsAddress( const std::string& vectorName, const std::string& datavectorName );
 
+    // Special address when time is used as x-axis
+    static RifEclipseSummaryAddress timeAddress();
+
     static std::string generateStringFromAddresses( const std::vector<RifEclipseSummaryAddress>& addressVector,
                                                     const std::string                            jointString = "; " );
 
@@ -147,6 +150,7 @@ public:
     auto operator<=>( const RifEclipseSummaryAddress& rhs ) const = default;
 
     bool isCalculated() const;
+    bool isTime() const;
 
     std::string                formatUiTextRegionToRegion() const;
     static std::pair<int, int> regionToRegionPairFromUiText( const std::string& s );
diff --git a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddressDefines.h b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddressDefines.h
index acea27c528..ff0ff26a38 100644
--- a/ApplicationLibCode/FileInterface/RifEclipseSummaryAddressDefines.h
+++ b/ApplicationLibCode/FileInterface/RifEclipseSummaryAddressDefines.h
@@ -47,7 +47,8 @@ enum class SummaryVarCategory
     SUMMARY_BLOCK,
     SUMMARY_BLOCK_LGR,
     SUMMARY_IMPORTED,
-    SUMMARY_ENSEMBLE_STATISTICS
+    SUMMARY_ENSEMBLE_STATISTICS,
+    SUMMARY_TIME // Used to represent time as along the x-axis
 };
 
 enum class SummaryIdentifierType