diff --git a/src/Date.cpp b/src/Date.cpp
index f82a80da3..07465fb68 100644
--- a/src/Date.cpp
+++ b/src/Date.cpp
@@ -100,7 +100,7 @@ Date::Date (const std::string& input, const std::string& format /* = "m/d/Y" */)
 
   unsigned int i = 0; // Index into input.
 
-  // Format may include: mMdDyYVaAbBhHNS
+  // Format may include: mMdDyYVaAbBhHNSjJ
   //
   // Note that the format should never include T or Z, as that interferes with
   // the potential parsing for ISO dates constructed from the above format.
@@ -666,6 +666,13 @@ int Date::dayOfWeek (const std::string& input)
   return -1;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+int Date::dayOfYear () const
+{
+  struct tm* t = localtime (&mT);
+  return t->tm_yday + 1;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int Date::monthOfYear (const std::string& input)
 {
diff --git a/src/Date.h b/src/Date.h
index 6fcfe806b..24572b260 100644
--- a/src/Date.h
+++ b/src/Date.h
@@ -75,6 +75,7 @@ public:
   int year () const;
   int weekOfYear (int) const;
   int dayOfWeek () const;
+  int dayOfYear () const;
   int hour () const;
   int minute () const;
   int second () const;
diff --git a/test/date.t.cpp b/test/date.t.cpp
index b04326e41..26c5d0f81 100644
--- a/test/date.t.cpp
+++ b/test/date.t.cpp
@@ -34,7 +34,7 @@ Context context;
 ////////////////////////////////////////////////////////////////////////////////
 int main (int argc, char** argv)
 {
-  UnitTest t (165);
+  UnitTest t (168);
 
   try
   {
@@ -242,6 +242,11 @@ int main (int argc, char** argv)
     t.is (fromString13.minute (),   34, "ctor (std::string) -> N");
     t.is (fromString13.second (),   56, "ctor (std::string) -> S");
 
+    // Day of year
+    t.is (Date ("1/1/2011",   "m/d/Y").dayOfYear (),   1, "dayOfYear (1/1/2011)   ->   1");
+    t.is (Date ("5/1/2011",   "m/d/Y").dayOfYear (), 121, "dayOfYear (5/1/2011)   -> 121");
+    t.is (Date ("12/31/2011", "m/d/Y").dayOfYear (), 365, "dayOfYear (12/31/2011) -> 365");
+
     // Easter
     Date e1 (Date::easter(1980));
     t.is (e1.toString (), "4/6/1980", "Easter 4/6/1980");