Function has_equivalent_datetime_metadata

numpy/core/src/multiarray/datetime.c:2974–3004

* Returns true if the datetime metadata matches */

 * Returns true if the datetime metadata matches
 */
NPY_NO_EXPORT npy_bool
has_equivalent_datetime_metadata(PyArray_Descr *type1, PyArray_Descr *type2)
{
    PyArray_DatetimeMetaData *meta1, *meta2;

    if ((type1->type_num != NPY_DATETIME &&
                        type1->type_num != NPY_TIMEDELTA) ||
                    (type2->type_num != NPY_DATETIME &&
                        type2->type_num != NPY_TIMEDELTA)) {
        return 0;
    }

    meta1 = get_datetime_metadata_from_dtype(type1);
    if (meta1 == NULL) {
        PyErr_Clear();
        return 0;
    }
    meta2 = get_datetime_metadata_from_dtype(type2);
    if (meta2 == NULL) {
        PyErr_Clear();
        return 0;
    }

    /* For generic units, the num is ignored */
    if (meta1->base == NPY_FR_GENERIC && meta2->base == NPY_FR_GENERIC) {
        return 1;
    }

    return meta1->base == meta2->base &&
            meta1->num == meta2->num;
}

/*
 * Casts a single datetime from having src_meta metadata into