split datetime definition from toml.hpp

tests/CMakeLists.txt

@@ -5,6 +5,7 @@ set(TEST_NAMES
     test_from_toml
     test_get
     test_value_operator
+    test_datetime
     )
 
 add_definitions("-Wall -Wpedantic")

tests/test_datetime.cpp

@@ -0,0 +1,23 @@
+#define BOOST_TEST_MODULE "test_datetime"
+#ifdef UNITTEST_FRAMEWORK_LIBRARY_EXIST
+#include <boost/test/unit_test.hpp>
+#else
+#define BOOST_TEST_NO_LIB
+#include <boost/test/included/unit_test.hpp>
+#endif
+#include <toml/toml.hpp>
+
+BOOST_AUTO_TEST_CASE(test_datetime_convertible)
+{
+    const auto now = std::chrono::system_clock::now();
+    toml::Datetime d1(now);
+    const std::chrono::system_clock::time_point cvt(d1);
+    toml::Datetime d2(cvt);
+
+    const auto time = std::chrono::system_clock::to_time_t(now);
+    toml::Datetime d3(time);
+    toml::Datetime d4(std::chrono::system_clock::from_time_t(time));
+
+    BOOST_CHECK_EQUAL(d1, d2);
+    BOOST_CHECK_EQUAL(d3, d4);
+}