diff --git a/include/date/date.h b/include/date/date.h
index c77273e..a7e0849 100644
--- a/include/date/date.h
+++ b/include/date/date.h
@@ -3694,21 +3694,6 @@ struct static_pow10<0>
     static CONSTDATA std::uint64_t value = 1;
 };
 
-template <class Rep, unsigned w, bool in_range = (w < 19)>
-struct make_precision
-{
-    using type = std::chrono::duration<Rep,
-                                       std::ratio<1, static_pow10<w>::value>>;
-    static CONSTDATA unsigned width = w;
-};
-
-template <class Rep, unsigned w>
-struct make_precision<Rep, w, false>
-{
-    using type = std::chrono::duration<Rep, std::micro>;
-    static CONSTDATA unsigned width = 6;
-};
-
 template <class Duration>
 class decimal_format_seconds
 {
diff --git a/test/date_test/detail/decimal_format_seconds.pass.cpp b/test/date_test/detail/decimal_format_seconds.pass.cpp
index cc8e3cd..9491b93 100644
--- a/test/date_test/detail/decimal_format_seconds.pass.cpp
+++ b/test/date_test/detail/decimal_format_seconds.pass.cpp
@@ -20,16 +20,16 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-// template <class Duration,
-//           unsigned w = width<std::common_type<
-//                                  Duration,
-//                                  std::chrono::seconds>::type::period::den>::value>
+// template <class Duration>
 // class decimal_format_seconds
 // {
+//     using CT = typename std::common_type<Duration, std::chrono::seconds>::type;
+//     using rep = typename CT::rep;
 // public:
-//     using precision = typename make_precision<w>::type;
-//     static auto constexpr width = make_precision<w>::width;
-// 
+//     static unsigned constexpr width = detail::width<CT::period::den>::value < 19 ?
+//                                       detail::width<CT::period::den>::value : 6u;
+//     using precision = std::chrono::duration<rep,
+//                                             std::ratio<1, static_pow10<width>::value>>;
 // private:
 //     std::chrono::seconds s_;
 //     precision            sub_s_;
diff --git a/test/date_test/detail/make_precision.pass.cpp b/test/date_test/detail/make_precision.pass.cpp
deleted file mode 100644
index efdec1c..0000000
--- a/test/date_test/detail/make_precision.pass.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) 2017 Howard Hinnant
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
-
-// template <unsigned w>
-// struct make_precision
-// {
-//     using type = std::chrono::duration<std::int64_t,
-//                                        std::ratio<1, static_pow10<w>::value>>;
-//     static constexpr unsigned width = w;
-// };
-
-#include "date.h"
-
-#include <cstdint>
-#include <type_traits>
-
-int
-main()
-{
-    using namespace date::detail;
-    using namespace std;
-    using namespace std::chrono;
-
-    static_assert(make_precision<int64_t, 0>::width ==  0, "");
-    static_assert(is_same<make_precision<int64_t, 0>::type, duration<int64_t, ratio<1, 1>>>{}, "");
-
-    static_assert(make_precision<int64_t, 1>::width ==  1, "");
-    static_assert(is_same<make_precision<int64_t, 1>::type, duration<int64_t, ratio<1, 10>>>{}, "");
-
-    static_assert(make_precision<int64_t, 2>::width ==  2, "");
-    static_assert(is_same<make_precision<int64_t, 2>::type, duration<int64_t, ratio<1, 100>>>{}, "");
-
-    static_assert(make_precision<int64_t, 3>::width ==  3, "");
-    static_assert(is_same<make_precision<int64_t, 3>::type, duration<int64_t, ratio<1, 1000>>>{}, "");
-
-    static_assert(make_precision<int64_t, 18>::width ==  18, "");
-    static_assert(is_same<make_precision<int64_t, 18>::type, duration<int64_t, ratio<1, 1000000000000000000>>>{}, "");
-
-    static_assert(make_precision<int64_t, 19>::width ==  6, "");
-    static_assert(is_same<make_precision<int64_t, 19>::type, microseconds>{}, "");
-
-    static_assert(make_precision<int64_t, 20>::width ==  6, "");
-    static_assert(is_same<make_precision<int64_t, 20>::type, microseconds>{}, "");
-}