diff --git a/src/rewrite/Duration.cpp b/src/rewrite/Duration.cpp
index 56d0ee4a5..d0cb4a469 100644
--- a/src/rewrite/Duration.cpp
+++ b/src/rewrite/Duration.cpp
@@ -25,11 +25,13 @@
 //
 ////////////////////////////////////////////////////////////////////////////////
 
+#include <vector>
+#include "task.h"
 #include "Duration.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 Duration::Duration ()
-: mSeconds (0)
+: mDays (0)
 {
 }
 
@@ -37,7 +39,13 @@ Duration::Duration ()
 Duration::Duration (const Duration& other)
 {
   throw std::string ("unimplemented Duration::Duration");
-  mSeconds = other.mSeconds;
+  mDays = other.mDays;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+Duration::Duration (const std::string& input)
+{
+  parse (input);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -46,12 +54,36 @@ Duration& Duration::operator= (const Duration& other)
   throw std::string ("unimplemented Duration::operator=");
   if (this != &other)
   {
-    mSeconds = other.mSeconds;
+    mDays = other.mDays;
   }
 
   return *this;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+Duration::operator int ()
+{
+  return (int) mDays;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+Duration::operator time_t ()
+{
+  return mDays;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool Duration::operator< (const Duration& other)
+{
+  return mDays < other.mDays;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool Duration::operator> (const Duration& other)
+{
+  return mDays > other.mDays;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 Duration::~Duration ()
 {
@@ -60,7 +92,68 @@ Duration::~Duration ()
 ////////////////////////////////////////////////////////////////////////////////
 void Duration::parse (const std::string& input)
 {
-  throw std::string ("unimplemented Duration::parse");
+  std::string lower_input = lowerCase (input);
+
+  std::vector <std::string> supported;
+  supported.push_back ("daily");
+  supported.push_back ("day");
+  supported.push_back ("weekly");
+  supported.push_back ("weekdays");
+  supported.push_back ("sennight");
+  supported.push_back ("biweekly");
+  supported.push_back ("fortnight");
+  supported.push_back ("monthly");
+  supported.push_back ("bimonthly");
+  supported.push_back ("quarterly");
+  supported.push_back ("biannual");
+  supported.push_back ("biyearly");
+  supported.push_back ("annual");
+  supported.push_back ("semiannual");
+  supported.push_back ("yearly");
+
+  std::vector <std::string> matches;
+  if (autoComplete (lower_input, supported, matches) == 1)
+  {
+    std::string found = matches[0];
+
+         if (found == "daily"    || found == "day")       mDays = 1;
+    else if (found == "weekdays")                         mDays = 1;
+    else if (found == "weekly"   || found == "sennight")  mDays = 7;
+    else if (found == "biweekly" || found == "fortnight") mDays = 14;
+    else if (found == "monthly")                          mDays = 30;
+    else if (found == "bimonthly")                        mDays = 61;
+    else if (found == "quarterly")                        mDays = 91;
+    else if (found == "semiannual")                       mDays = 183;
+    else if (found == "yearly"   || found == "annual")    mDays = 365;
+    else if (found == "biannual" || found == "biyearly")  mDays = 730;
+  }
+
+  // Support \d+ d|w|m|q|y
+  else
+  {
+    // Verify all digits followed by d, w, m, q, or y.
+    unsigned int length = lower_input.length ();
+    for (unsigned int i = 0; i < length; ++i)
+    {
+      if (! isdigit (lower_input[i]) &&
+          i == length - 1)
+      {
+        int number = ::atoi (lower_input.substr (0, i).c_str ());
+
+        switch (lower_input[length - 1])
+        {
+        case 'd': mDays = number *   1; break;
+        case 'w': mDays = number *   7; break;
+        case 'm': mDays = number *  30; break;
+        case 'q': mDays = number *  91; break;
+        case 'y': mDays = number * 365; break;
+        }
+      }
+    }
+  }
+
+  if (mDays == 0)
+    throw std::string ("The duration '") + input + "' was not recognized.";
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/rewrite/Duration.h b/src/rewrite/Duration.h
index dee0ee578..d5e1361dc 100644
--- a/src/rewrite/Duration.h
+++ b/src/rewrite/Duration.h
@@ -28,19 +28,26 @@
 #define INCLUDED_DURATION
 
 #include <string>
+#include <time.h>
 
 class Duration
 {
 public:
   Duration ();                           // Default constructor
   Duration (const Duration&);            // Copy constructor
+  Duration (const std::string&);         // Parse
   Duration& operator= (const Duration&); // Assignment operator
+  bool operator< (const Duration&);
+  bool operator> (const Duration&);
   ~Duration ();                          // Destructor
 
+  operator int ();
+  operator time_t ();
+
   void parse (const std::string&);
 
 private:
-  int mSeconds;
+  time_t mDays;
 };
 
 #endif