Function raise_if_datetime64_metadata_cast_error

numpy/core/src/multiarray/datetime.c:1446–1472

* Tests whether a datetime64 can be cast from the source metadata * to the destination metadata according to the specified casting rule. * * Returns -1 if an exception was raised, 0 otherwise. */

 * Returns -1 if an exception was raised, 0 otherwise.
 */
NPY_NO_EXPORT int
raise_if_datetime64_metadata_cast_error(char *object_type,
                            PyArray_DatetimeMetaData *src_meta,
                            PyArray_DatetimeMetaData *dst_meta,
                            NPY_CASTING casting)
{
    if (can_cast_datetime64_metadata(src_meta, dst_meta, casting)) {
        return 0;
    }
    else {
        PyObject *src = metastr_to_unicode(src_meta, 0);
        if (src == NULL) {
            return -1;
        }
        PyObject *dst = metastr_to_unicode(dst_meta, 0);
        if (dst == NULL) {
            Py_DECREF(src);
            return -1;
        }
        PyErr_Format(PyExc_TypeError,
            "Cannot cast %s from metadata %S to %S according to the rule %s",
            object_type, src, dst, npy_casting_to_string(casting));
        Py_DECREF(src);
        Py_DECREF(dst);
        return -1;
    }
}

/*
 * Tests whether a timedelta64 can be cast from the source metadata