diff --git a/PDP10/ka10_ai.c b/PDP10/ka10_ai.c
index a9e1da20..27f4f247 100644
--- a/PDP10/ka10_ai.c
+++ b/PDP10/ka10_ai.c
@@ -809,7 +809,7 @@ static void channel_command (uint64 data)
         if (check_nxm (data, &n, &data2, &n2))
             break;
 
-        (void)clock_gettime(CLOCK_REALTIME, &ts);
+        (void)sim_rtcn_get_time (&ts, 0);
         latency_timer = ts.tv_nsec / 100000;
         latency_timer %= 254;
         M[data & ADDR] = latency_timer & 0377;
@@ -938,7 +938,7 @@ t_stat ai_devio(uint32 dev, uint64 *data) {
 
     case CONI|4:
         /* Latency timer, timer unit, attention unit. */
-        (void)clock_gettime(CLOCK_REALTIME, &ts);
+        (void)sim_rtcn_get_time (&ts, 0);
         latency_timer = ts.tv_nsec / 100000;
         latency_timer %= 254;
         *data = (latency_timer << 022)
diff --git a/PDP10/ka10_pclk.c b/PDP10/ka10_pclk.c
index bcd56a31..f548ca93 100644
--- a/PDP10/ka10_pclk.c
+++ b/PDP10/ka10_pclk.c
@@ -70,7 +70,7 @@ DEVICE pclk_dev = {
 */
 t_stat pclk_devio(uint32 dev, uint64 *data)
 {
-    time_t t=time(NULL);
+    time_t t=sim_get_time(NULL);
     struct tm *dt;
     uint64 hour=12, minute=1, seconds=2, milliseconds=3;
     uint64 coni_word = ((minute&0xF)<<26) | (seconds<<20) | milliseconds;
diff --git a/PDP10/ka10_pd.c b/PDP10/ka10_pd.c
index 47438ab9..9ba6337a 100644
--- a/PDP10/ka10_pd.c
+++ b/PDP10/ka10_pd.c
@@ -77,7 +77,7 @@ DEVICE              pd_dev = {
 
 static uint64 pd_ticks (void)
 {
-    time_t t = time(NULL);
+    time_t t = sim_get_time(NULL);
     struct tm *x = localtime(&t);
     uint64 seconds;
     seconds = 86400ULL * x->tm_yday;
diff --git a/PDP10/kl10_fe.c b/PDP10/kl10_fe.c
index 3acaec22..a4915cdf 100644
--- a/PDP10/kl10_fe.c
+++ b/PDP10/kl10_fe.c
@@ -1026,7 +1026,7 @@ dte_function(UNIT *uptr)
 
         case PRI_EMRDT:            /* Request Date/Time */
                {
-                   time_t t = time(NULL);
+                   time_t t = sim_get_time(NULL);
                    struct tm *tm = localtime(&t);
                    int yr = tm->tm_year + 1900;
                    int tim = (((tm->tm_hour * 60) + tm->tm_min) * 60) +