Retrieve Washington open data portal dataset last update timestamp

[gregoryfoster]

Enable the retrieval of the metadata last update timestamp from particular datasets on the Washington state Socrata-based open data portal. Use the sodapy library for interfacing to the Socrata API. Enable name-based retrieval of the datasets (encapsulate the Socrata identifier, recognizing that this may entail upkeep). And transform the Unix-epoch timestamp into a Python datetime value.

The primary use case here is checking to see if more recent data is available without pulling down the entire dataset or having to execute multiple lines of code.