diff --git a/date.h b/date.h
index 61364ba..30117eb 100644
--- a/date.h
+++ b/date.h
@@ -3096,6 +3096,11 @@ public:
         return to24hr();
     }
 
+    CONSTCD14 precision to_duration() const noexcept
+    {
+        return static_cast<precision>(*this);
+    }
+
     CONSTCD14 time_of_day_storage& make24() noexcept {base::make24(); return *this;}
     CONSTCD14 time_of_day_storage& make12() noexcept {base::make12(); return *this;}
 
@@ -3157,6 +3162,11 @@ public:
         return to24hr() + m_;
     }
 
+    CONSTCD14 precision to_duration() const noexcept
+    {
+        return static_cast<precision>(*this);
+    }
+
     CONSTCD14 time_of_day_storage& make24() noexcept {base::make24(); return *this;}
     CONSTCD14 time_of_day_storage& make12() noexcept {base::make12(); return *this;}
 
@@ -3223,6 +3233,11 @@ public:
         return to24hr() + m_ + s_;
     }
 
+    CONSTCD14 precision to_duration() const noexcept
+    {
+        return static_cast<precision>(*this);
+    }
+
     CONSTCD14 time_of_day_storage& make24() noexcept {base::make24(); return *this;}
     CONSTCD14 time_of_day_storage& make12() noexcept {base::make12(); return *this;}
 
@@ -3298,6 +3313,11 @@ public:
         return to24hr() + m_ + s_ + sub_s_;
     }
 
+    CONSTCD14 precision to_duration() const noexcept
+    {
+        return static_cast<precision>(*this);
+    }
+
     CONSTCD14 time_of_day_storage& make24() noexcept {base::make24(); return *this;}
     CONSTCD14 time_of_day_storage& make12() noexcept {base::make12(); return *this;}