diff --git a/Tests/Conformance/DOIT3 b/Tests/Conformance/DOIT3
index 7bd9246..92debe7 100644
--- a/Tests/Conformance/DOIT3
+++ b/Tests/Conformance/DOIT3
@@ -1,4 +1,5 @@
 {1} c89oldfeat.c
+{1} c89time.c
 {1} c95digraph.c
 {1} c95iso646.c
 {1} c99fam.c
diff --git a/Tests/Conformance/c89time.c b/Tests/Conformance/c89time.c
new file mode 100644
index 0000000..e8d42c9
--- /dev/null
+++ b/Tests/Conformance/c89time.c
@@ -0,0 +1,167 @@
+/*
+ * Test <time.h> functions (C89).
+ */
+
+#include <time.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main(void) {
+        clock_t clock_start;
+        time_t time_start;
+        struct tm tm1, tm2;
+        time_t time1, time2;
+        char buf[20];
+        
+        clock_start = clock();
+        time(&time_start);
+        
+        tm1.tm_year = 2023 - 1900;
+        tm1.tm_mon = 1 - 1;
+        tm1.tm_mday = 5;
+        tm1.tm_hour = 18;
+        tm1.tm_min = 25;
+        tm1.tm_sec = 54;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = 4;
+        
+        if (strcmp(asctime(&tm1), "Thu Jan  5 18:25:54 2023\n") != 0)
+                goto Fail;
+        
+        tm1.tm_wday = -12345;
+        tm1.tm_yday = 12345;
+        time1 = mktime(&tm1);
+        if (tm1.tm_wday != 4)
+                goto Fail;
+        if (tm1.tm_yday != 4)
+                goto Fail;
+                
+        if (strcmp(ctime(&time1), "Thu Jan  5 18:25:54 2023\n") != 0)
+                goto Fail;
+        
+        if (strcmp(asctime(&tm1), "Thu Jan  5 18:25:54 2023\n") != 0)
+                goto Fail;
+
+        tm1.tm_year = 1978 - 1900;
+        tm1.tm_mon = 12 - 1;
+        tm1.tm_mday = 29;
+        tm1.tm_hour = 4;
+        tm1.tm_min = 2;
+        tm1.tm_sec = 5;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = 5;
+
+        if (strcmp(asctime(&tm1), "Fri Dec 29 04:02:05 1978\n") != 0)
+                goto Fail;
+
+        tm1.tm_wday = -12345;
+        tm1.tm_yday = 12345;
+        time1 = mktime(&tm1);
+        if (tm1.tm_wday != 5)
+                goto Fail;
+        if (tm1.tm_yday != 362)
+                goto Fail;
+
+        if (strcmp(asctime(&tm1), "Fri Dec 29 04:02:05 1978\n") != 0)
+                goto Fail;
+
+        if (strcmp(ctime(&time1), "Fri Dec 29 04:02:05 1978\n") != 0)
+                goto Fail;
+
+        tm1.tm_year = 2001 - 1900 - 2730 - 3;
+        tm1.tm_mon = 32760;
+        tm1.tm_mday = 31;
+        tm1.tm_hour = 26280;
+        tm1.tm_min = -20;
+        tm1.tm_sec = 32400;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = -12345;
+        time1 = mktime(&tm1);
+        
+        if (tm1.tm_yday != 29)
+                goto Fail;
+
+        if (strcmp(ctime(&time1), "Tue Jan 30 08:40:00 2001\n") != 0)
+                goto Fail;
+        
+        if (strcmp(asctime(localtime(&time1)), "Tue Jan 30 08:40:00 2001\n") != 0)
+                goto Fail;
+
+        tm1.tm_year = 2001 - 1900 + 2730 + 3;
+        tm1.tm_mon = -32760;
+        tm1.tm_mday = 31 - 366;
+        tm1.tm_hour = -26280;
+        tm1.tm_min = +200;
+        tm1.tm_sec = 32400;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = -12345;
+        time1 = mktime(&tm1);
+        
+        if (tm1.tm_yday != 30)
+                goto Fail;
+        
+        if (strcmp(asctime(localtime(&time1)), "Mon Jan 31 12:20:00 2000\n") != 0)
+                goto Fail;
+
+        if (strcmp(ctime(&time1), "Mon Jan 31 12:20:00 2000\n") != 0)
+                goto Fail;
+        
+        if (strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", &tm1) != 19)
+                goto Fail;
+        if (strcmp(buf, "2000-01-31 12:20:00") != 0)
+                goto Fail;
+
+        tm1.tm_sec += 100;
+        time2 = mktime(&tm1);
+        if (difftime(time2, time1) != 100)
+                goto Fail;
+
+        tm2 = *gmtime(&time1);
+        if (tm2.tm_year != tm1.tm_year)
+                goto Fail;
+        if (tm2.tm_mon != tm1.tm_mon)
+                goto Fail;
+        if (abs(tm2.tm_mday - tm1.tm_mday) > 1)
+                goto Fail;
+
+        /* Test limits of time_t in ORCA/C */
+
+        tm1.tm_year = 1969 - 1900;
+        tm1.tm_mon = 11 - 1;
+        tm1.tm_mday = 13;
+        tm1.tm_hour = 0;
+        tm1.tm_min = 0;
+        tm1.tm_sec = 0;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = -12345;
+        time1 = mktime(&tm1);
+
+        if (strcmp(ctime(&time1), "Thu Nov 13 00:00:00 1969\n") != 0)
+                goto Fail;
+
+        tm1.tm_year = 2105 - 1900;
+        tm1.tm_mon = 12 - 1;
+        tm1.tm_mday = 20;
+        tm1.tm_hour = 6;
+        tm1.tm_min = 28;
+        tm1.tm_sec = 15;
+        tm1.tm_isdst = -1;
+        tm1.tm_wday = -12345;
+        time1 = mktime(&tm1);
+        
+        if (strcmp(ctime(&time1), "Sun Dec 20 06:28:15 2105\n") != 0)
+                goto Fail;
+
+        if (clock() - clock_start < 0)
+                goto Fail;
+        if (difftime(time(NULL), time_start) < 0)
+                goto Fail;
+
+        printf ("Passed Conformance Test c89time\n");
+        return 0;
+
+Fail:
+        printf ("Failed Conformance Test c89time\n");
+}