I've actually done this, and it's very fun. My main testing dataset is the 470,000 records from the Met, with 33k unique date values. Fortunately they include

I've actually done this, and it's very fun. My main testing dataset is the 470,000 records from the Met, with 33k unique date values. Fortunately they include machine-readable dates I can validate against. https://github.com/kjrocker/epochal https://github.com/kjrocker/epochal