Initial unit test submission.

test/date_test/durations.pass.cpp

@@ -0,0 +1,37 @@
+// Howard Hinnant
+// This work is licensed under a Creative Commons Attribution 4.0 International License.
+// http://creativecommons.org/licenses/by/4.0/
+
+// durations
+// 
+// using days = std::chrono::duration
+//     <int, std::ratio_multiply<std::ratio<24>, std::chrono::hours::period>>;
+// 
+// using weeks = std::chrono::duration
+//     <int, std::ratio_multiply<std::ratio<7>, days::period>>;
+// 
+// using years = std::chrono::duration
+//     <int, std::ratio_multiply<std::ratio<146097, 400>, days::period>>;
+// 
+// using months = std::chrono::duration
+//     <int, std::ratio_divide<years::period, std::ratio<12>>>;
+// 
+// time_point
+// 
+// using day_point = std::chrono::time_point<std::chrono::system_clock, days>;
+
+#include "date.h"
+
+#include <type_traits>
+
+static_assert(date::days{1} == std::chrono::seconds{86400}, "");
+static_assert(date::weeks{1} == std::chrono::seconds{604800}, "");
+static_assert(date::months{1} == std::chrono::seconds{2629746}, "");
+static_assert(date::years{1} == std::chrono::seconds{31556952}, "");
+
+static_assert(std::is_same<date::day_point::duration, date::days>{}, "");
+
+int
+main()
+{
+}