from dbnomics import fetch_series, fetch_series_by_api_link
df = fetch_series('BIS', 'long_cpi', max_nb_series=1000)
The snippet doesn’t show which date is out of bounds; please post the full traceback and versions of dbnomics and pandas. The failure is likely during conversion of an observation period to a pandas timestamp. Checking the raw BIS series response would show whether it contains an unexpected date.