diff -r 79e5bb0d9b8e Modules/timemodule.c
--- a/Modules/timemodule.c	Tue Feb 18 09:37:43 2014 +0100
+++ b/Modules/timemodule.c	Tue Feb 18 10:18:21 2014 +0100
@@ -381,10 +381,19 @@ If the platform supports the tm_gmtoff a
 attributes only.");
 
 static int
-pylocaltime(time_t *timep, struct tm *result)
+pylocaltime(time_t *timep, struct tm *result, const char *funcname)
 {
     struct tm *local;
 
+#ifdef _AIX
+    if (*timep < 0) {
+        PyErr_Format(PyExc_OverflowError,
+                     "%s() timestamp argument out of range",
+                     funcname);
+        return -1;
+    }
+#endif
+
     assert (timep != NULL);
     local = localtime(timep);
     if (local == NULL) {
@@ -408,7 +417,7 @@ time_localtime(PyObject *self, PyObject 
 
     if (!parse_time_t_args(args, "|O:localtime", &when))
         return NULL;
-    if (pylocaltime(&when, &buf) == -1)
+    if (pylocaltime(&when, &buf, "localtime") == -1)
         return NULL;
     return tmtotuple(&buf);
 }
@@ -592,7 +601,7 @@ time_strftime(PyObject *self, PyObject *
 
     if (tup == NULL) {
         time_t tt = time(NULL);
-        if (pylocaltime(&tt, &buf) == -1)
+        if (pylocaltime(&tt, &buf, "strftime") == -1)
             return NULL;
     }
     else if (!gettmarg(tup, &buf) || !checktm(&buf))
@@ -781,7 +790,7 @@ time_asctime(PyObject *self, PyObject *a
         return NULL;
     if (tup == NULL) {
         time_t tt = time(NULL);
-        if (pylocaltime(&tt, &buf) == -1)
+        if (pylocaltime(&tt, &buf, "asctime") == -1)
             return NULL;
 
     } else if (!gettmarg(tup, &buf) || !checktm(&buf))
@@ -803,7 +812,7 @@ time_ctime(PyObject *self, PyObject *arg
     struct tm buf;
     if (!parse_time_t_args(args, "|O:ctime", &tt))
         return NULL;
-    if (pylocaltime(&tt, &buf) == -1)
+    if (pylocaltime(&tt, &buf, "ctime") == -1)
         return NULL;
     return _asctime(&buf);
 }