Author here. I've used pg a ton in the past in production systems as an operational database. Never really missed having datediff.
Once we started using it as a data warehouse I noticed that function was missing -- most other data warehouses have it. Thought it would be worth providing an implementation since date stuff is annoying to do.
Once we started using it as a data warehouse I noticed that function was missing -- most other data warehouses have it. Thought it would be worth providing an implementation since date stuff is annoying to do.