diff --git a/tests/ansi/strftime.c b/tests/ansi/strftime.c
index 69ec6427dc..e30df21cb6 100644
--- a/tests/ansi/strftime.c
+++ b/tests/ansi/strftime.c
@@ -11,8 +11,8 @@ int main() {
 		fputs("strftime testcase could not set locale, errors may be expected!", stderr);
 	}
 
-	char timebuf[16];
-	char result[16] = " 8";
+	char timebuf[32];
+	char result[32] = " 8";
 	struct tm tm;
 	tm.tm_sec = 0;
 	tm.tm_min = 17;
@@ -33,6 +33,24 @@ int main() {
 	strftime(timebuf, sizeof(timebuf), "%X", &tm);
 	assert(!strcmp(timebuf, "17:17:00"));
 
+	memset(timebuf, 0, sizeof(timebuf));
+	strftime(timebuf, sizeof(timebuf), "%D", &tm);
+	assert(!strcmp(timebuf, "03/08/21"));
+
+	memset(timebuf, 0, sizeof(timebuf));
+	strftime(timebuf, sizeof(timebuf), "%OB %Ob", &tm);
+	assert(!strcmp(timebuf, "March Mar"));
+
+	memset(timebuf, 0, sizeof(timebuf));
+	strftime(timebuf, sizeof(timebuf), "%c", &tm);
+	memset(result, 0, sizeof(result));
+	strftime(result, sizeof(result), "%a %b %e %H:%M:%S %Y", &tm);
+	assert(!strcmp(timebuf, result));
+
+	memset(timebuf, 0, sizeof(timebuf));
+	strftime(timebuf, sizeof(timebuf), "%k %p %P%n", &tm);
+	assert(!strcmp(timebuf, "17 PM pm\n"));
+
 	memset(timebuf, 0, sizeof(timebuf));
 	strftime(timebuf, sizeof(timebuf), "%a %A", &tm);
 	assert(!strcmp(timebuf, "Tue Tuesday"));