diff --git a/src/ISO8601.cpp b/src/ISO8601.cpp
index 7685965e9..4b21eed52 100644
--- a/src/ISO8601.cpp
+++ b/src/ISO8601.cpp
@@ -1043,6 +1043,28 @@ std::string ISO8601d::toISO () const
   return iso.str ();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// 1998-01-19T07:00:00 =  YYYY-MM-DDThh:mm:ss
+std::string ISO8601d::toISOLocalExtended () const
+{
+  struct tm* t = localtime (&_date);
+
+  std::stringstream iso;
+  iso << std::setw (4) << std::setfill ('0') << t->tm_year + 1900
+      << "-"
+      << std::setw (2) << std::setfill ('0') << t->tm_mon + 1
+      << "-"
+      << std::setw (2) << std::setfill ('0') << t->tm_mday
+      << "T"
+      << std::setw (2) << std::setfill ('0') << t->tm_hour
+      << ":"
+      << std::setw (2) << std::setfill ('0') << t->tm_min
+      << ":"
+      << std::setw (2) << std::setfill ('0') << t->tm_sec;
+
+  return iso.str ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 double ISO8601d::toJulian () const
 {
diff --git a/src/ISO8601.h b/src/ISO8601.h
index 0a3fbd0f0..54642cbce 100644
--- a/src/ISO8601.h
+++ b/src/ISO8601.h
@@ -49,6 +49,7 @@ public:
   time_t toEpoch () const;
   std::string toEpochString () const;
   std::string toISO () const;
+  std::string toISOLocalExtended () const;
   double toJulian () const;
   void toMDY (int&, int&, int&) const;
   const std::string toString (const std::string& format = "m/d/Y") const;