1 files changed, 45 insertions, 0 deletions
diff --git a/lib/mlibc/tests/ansi/timegm.c b/lib/mlibc/tests/ansi/timegm.c
new file mode 100644
index 0000000..f5af03e
--- /dev/null
+++ b/lib/mlibc/tests/ansi/timegm.c
@@ -0,0 +1,45 @@
+#include <time.h>
+#include <stdio.h>
+#include <assert.h>
+
+int main() {
+	struct tm soon = {};
+	soon.tm_sec = 0;
+	soon.tm_min = 0;
+	soon.tm_hour = 0;
+	soon.tm_mday = 1;
+	soon.tm_mon = 0;
+	soon.tm_year = 70;
+	time_t result;
+	time_t expected_result = 0;
+	// This should be epoch.
+	result = timegm(&soon);
+	printf("epoch: %ld\n", result);
+	assert(result == expected_result);
+
+	soon.tm_sec = 12;
+	soon.tm_min = 8;
+	soon.tm_hour = 16;
+	soon.tm_mday = 17;
+	soon.tm_mon = 4;
+	soon.tm_year = 122;
+	expected_result = 1652803692;
+	result = timegm(&soon);
+	// On my host, this returned 1652803692, verify this.
+	printf("epoch: %ld\n", result);
+	assert(result == expected_result);
+
+	soon.tm_sec = 45;
+	soon.tm_min = 42;
+	soon.tm_hour = 17;
+	soon.tm_mday = 16;
+	soon.tm_mon = 8;
+	soon.tm_year = 69;
+	expected_result = -9181035;
+	result = timegm(&soon);
+	// On my host, this returned -9181035, verify this.
+	printf("epoch: %ld\n", result);
+	assert(result == expected_result);
+
+	return 0;
+}