Rails allows calling `to_s` with an optional format argument on dates. This can lead to cryptic "wrong number of args" errors when you end up calling something like `http://nil.to _s(:db)` Using the alias `to_formatted_s(:db)` leads to a much nicer "no method error"
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Creating your own epoch is pretty common. PG stores time as a 64 bit integer representing microseconds since 01-01-2000 (also I was mistaken in my other tweet, OSX is since 2001)
If you aren't specifically storing a 32 bit integer as seconds, there's not much reason to use 1970-01-01 as your 0 point, it's pretty arbitrary either way
