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diff --git a/tests/unit/datetime.c b/tests/unit/datetime.c
new file mode 100644
index 0000000..591dc9f
--- /dev/null
+++ b/tests/unit/datetime.c
@@ -0,0 +1,26 @@
+#include "glk.h"
+#include "glkunit.h"
+
+static int
+test_current_time_equals_current_simple_time(void)
+{
+	glktimeval_t timeval;
+
+	/* This test will fail if the following two operations do not occur within
+	a second of each other. That is not a robust test, but you could argue that
+	there is a serious bug if either operation takes more than one second. */
+	glk_current_time(&timeval);
+	glsi32 simple_time = glk_current_simple_time(1);
+	ASSERT_EQUAL(simple_time, timeval.low_sec);
+
+	glk_current_time(&timeval);
+	glsi32 simple_time_high_bits = glk_current_simple_time(0xFFFFFFFF);
+	ASSERT_EQUAL(simple_time_high_bits, timeval.high_sec);
+
+	SUCCEED;
+}
+
+struct TestDescription tests[] = {
+	{ "current time equals simple time", test_current_time_equals_current_simple_time },
+	{ NULL, NULL }
+};