Datetime does need to be part of the spec if you want your markup files portable otherwise every TOML parser might decode a date slightly differently. In that r

Datetime does need to be part of the spec if you want your markup files portable otherwise every TOML parser might decode a date slightly differently. In that regard it is really no different to saying "01" (string) is different to 1 (integer) in terms of preserving your data's integrity.