BigQuery load_table_from_dataframe mangles DATETIME values (INVALID or wrong dates)
This was a real backend limitation: Parquet uploads couldnt carry DATETIME values, so the client mapped datetime64[ns] to TIMESTAMP and values got mangled or forced to UTC. The BigQuery team later fixed the backend bug, but at the time the verified workarounds (confirmed by multiple reporters) were: 1. Use the strea…
Problem outcome: unknown