diff --git a/c/timeconv_test/timeconv_test.c b/c/timeconv_test/timeconv_test.c
index d3ab285..ee628c0 100644
--- a/c/timeconv_test/timeconv_test.c
+++ b/c/timeconv_test/timeconv_test.c
@@ -5,12 +5,16 @@
 
 #include "timeconv.h"
 
-void usec_test()
+void conv_test()
 {
 	struct tm t;
 	struct timeval tv;
-	uint64_t usec = 0;
+	struct timespec ts;
+	struct timecent tc;
+	struct timemil tl;
+	uint64_t pack64 = 0;
 	char buf[256];
+	size_t i = 0;
 
 	putenv("TZ=GMT+0");
 
@@ -22,26 +26,43 @@ void usec_test()
 	t.tm_year = 2011-1900;
 	t.tm_isdst = 0;
 
-	tv.tv_sec = mktime(&t);
-	tv.tv_usec = 798431;
+	for (i = 0; i < 4; i++) {
+		tv.tv_sec = mktime(&t);
+		ts.tv_sec = mktime(&t);
+		tc.tv_sec = mktime(&t);
+		tl.tv_sec = mktime(&t);
 
-	usec = usec_from_timeval(tv);
-
-	memset(&tv, 0, sizeof(tv));
-
-	tv = timeval_from_usec(usec);
-
-	memset(&t, 0, sizeof(t));
-
-	t = *gmtime(&tv.tv_sec);
-
-	strftime(buf, sizeof(buf), "%Y.%m.%d %H:%M:%S", &t);
-	printf("%s\n", buf);
+		switch (i) {
+		case 0: pack64 = usec_from_timeval(tv);
+			tv.tv_usec = 798431;
+			memset(&tv, 0, sizeof(tv));
+			tv = timeval_from_usec(pack64);
+		break;
+		case 1: pack64 = nsec_from_timespec(ts);
+			ts.tv_nsec = 798431;
+			memset(&ts, 0, sizeof(ts));
+			ts = timespec_from_nsec(pack64);
+		break;
+		case 2: pack64 = csec_from_timecent(tc);
+			tc.tv_csec = 798431;
+			memset(&tc, 0, sizeof(tc));
+			tc = timecent_from_csec(pack64);
+		break;
+		case 3: pack64 = msec_from_timemil(tl);
+			tl.tv_msec = 798431;
+			memset(&tl, 0, sizeof(tl));
+			tl = timemil_from_msec(pack64);
+		break;
+		default:;
+		}
+		strftime(buf, sizeof(buf), "%Y.%m.%d %H:%M:%S", gmtime(&tv.tv_sec));
+		printf("%s\n", buf);
+	}
 }
 
 int main(int argc, char *argv[])
 {
-	usec_test();
+	conv_test();
 
 	return 0;
 }