mike-burns/aeson — comment on commit 4fbd5b9139d487dd7eb00fe5674e424489a85b7c
File: Data/Aeson/Types/Class.hs line 639
By mike-burns:

'The value of an absent time zone offset is "Z"', according to ECMA-262. I took this to mean that this would be fine as a `ZonedTime`, with an offset of +00:00.