```purescript > toRFC3339String bottom (RFC3339String "000-271820-01-01T00:00:00.0Z") ``` Possibly due to `bottom` for `Year` being negative: https://github.com/purescript/purescript-datetime/blob/ffdd94fa0c4ac5d89107b0437aece0556970dcef/src/Data/Date/Component.purs#L28