1 files changed, 59 insertions, 0 deletions
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp
new file mode 100644
index 0000000000000..dfb3c5f982f2c
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp
@@ -0,0 +1,59 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class year;
+
+// constexpr year operator+(const year& x, const years& y) noexcept;
+//   Returns: year(int{x} + y.count()).
+//
+// constexpr year operator+(const years& x, const year& y) noexcept;
+//   Returns: y + x
+
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename Y, typename Ys>
+constexpr bool testConstexpr()
+{
+    Y y{1001};
+    Ys offset{23};
+    if (y + offset != Y{1024}) return false;
+    if (offset + y != Y{1024}) return false;
+    return true;
+}
+
+int main()
+{
+    using year  = std::chrono::year;
+    using years = std::chrono::years;
+
+    ASSERT_NOEXCEPT(                std::declval<year>() + std::declval<years>());
+    ASSERT_SAME_TYPE(year, decltype(std::declval<year>() + std::declval<years>()));
+
+    ASSERT_NOEXCEPT(                std::declval<years>() + std::declval<year>());
+    ASSERT_SAME_TYPE(year, decltype(std::declval<years>() + std::declval<year>()));
+
+    static_assert(testConstexpr<year, years>(), "");
+
+    year y{1223};
+    for (int i = 1100; i <= 1110; ++i)
+    {
+        year y1 = y + years{i};
+        year y2 = years{i} + y;
+        assert(y1 == y2);
+        assert(static_cast<int>(y1) == i + 1223);
+        assert(static_cast<int>(y2) == i + 1223);
+    }
+}