Not sure if that's what you're looking for. But Airboxr (my product) syncs with Hubspot to pull data into Google Sheets and standardizes all dates into YYYY-MM-DD format.
Airboxr is slightly different from connectors in that: instead of dumping your data from Hubspot into Google Sheets, you use it to create queries as output (e.g., a pivot table of no. of new contacts added by date). You can save those queries as Hops (sort of like Zaps in Zapier) and retrieve the data from any Google Sheet.