Several date and time formats were blindly imported from Rails' Date/Time formats, but I'd expect several of those are never in a CSV (e.g. the 23 digit timestamp with nanoseconds).
I've removed the long numbers-only date/time formats, because these can false positive, e.g. if you have 6-digit identifiers, a lot of them will look like dates, e.g. 12340101.
There are very likely other formats that can be removed due to their never appearing in CSVs.
Coverage increased (+0.51%) to 96.42% when pulling 1fe84b19dd14103be68d97a26075c4bc3f668533 on jpmckinney:fewer_formats into 08ab3af84a892ab3eed054d8f60da1926e5ec67f on theodi:master.
From #105
I've removed the long numbers-only date/time formats, because these can false positive, e.g. if you have 6-digit identifiers, a lot of them will look like dates, e.g. 12340101.
There are very likely other formats that can be removed due to their never appearing in CSVs.
Fixes #106