gh-111513: Improve datetime.fromtimestamp's error message

Misc/NEWS.d/next/Library/2024-09-19-16-00-22.gh-issue-111513.6jHm02.rst

@@ -0,0 +1 @@
+Improve the error message that may be raised by :meth:`datetime.date.fromtimestamp`.

Python/pytime.c

@@ -387,6 +387,10 @@ pytime_object_to_denominator(PyObject *obj, time_t *sec, long *numerator,
         *sec = _PyLong_AsTime_t(obj);
         *numerator = 0;
         if (*sec == (time_t)-1 && PyErr_Occurred()) {
+            if (PyErr_ExceptionMatches(PyExc_TypeError)) {
+                PyErr_Format(PyExc_TypeError,
+                             "argument must be int or float, not %T", obj);
+            }
             return -1;
         }
         return 0;