16     using time_point_h = std::chrono::time_point<
17         std::chrono::system_clock, std::chrono::hours>;
18     using time_point_m = std::chrono::time_point<
19         std::chrono::system_clock, std::chrono::minutes>;
20     using time_point_s = std::chrono::time_point<
21         std::chrono::system_clock, std::chrono::seconds>;
22     using time_point_ms = std::chrono::time_point<
23         std::chrono::system_clock, std::chrono::milliseconds>;
24     using time_point_us = std::chrono::time_point<
25         std::chrono::system_clock, std::chrono::microseconds>;
33 TEST_SUBMODULE(chrono, m) {  in TEST_SUBMODULE()  argument
34     using system_time = std::chrono::system_clock::time_point;  in TEST_SUBMODULE()
35     using steady_time = std::chrono::steady_clock::time_point;  in TEST_SUBMODULE()
37     using timespan = std::chrono::duration<int64_t, std::nano>;  in TEST_SUBMODULE()
38     using timestamp = std::chrono::time_point<std::chrono::system_clock, timespan>;  in TEST_SUBMODULE()
42     m.def("test_chrono1", []() { return std::chrono::system_clock::now(); });  in TEST_SUBMODULE()
50     m.def("test_chrono3", [](std::chrono::system_clock::duration d) { return d; });  in TEST_SUBMODULE()
58     m.def("test_chrono5", []() { return std::chrono::steady_clock::now(); });  in TEST_SUBMODULE()
66     m.def("test_chrono7", [](std::chrono::microseconds t) { return t; });  in TEST_SUBMODULE()
68 …m.def("test_chrono_float_diff", [](std::chrono::duration<float> a, std::chrono::duration<float> b)…  in TEST_SUBMODULE()