Temporal already supports using a space instead of a T as a separator between date and time (Temporal#DateTimeSeparator), as per the RFC 3339 specification. Is it possible to recognize it officially in the Date Spec (Spec#Date Time String Format)?
(Currently some browsers/engines already support it, but some don’t. I believe the usage of Date will still be predominant in the nearly future, and many SQL databases use RCF 3339 as the default date format.)
I am not expecting Date would parse everything Temporal could parse; just supporting the space would be enough, at least for me.