Add LocalDateTime scalar?

[martinbonnin]

Right now we have:

• DateTime, exact point in time with UTC offset: 2011-08-30T13:22:53.108+03:30
• LocalDate, a local date without a time-zone: 1983-10-20

But we're missing a way to represent a local date with a time like 2007-12-03T10:15:30

It cannot be represented as a DateTime because the semantics are different. A LocalDateTime point in time might change if some of our governments decide to change timezones.

The specification could be relatively close to the Java LocalDateTime. I can write something up if there's interest.

Prior art:

• [RFC] New Scalar for date-time graphql-spec#579
• Proposal: LocalDateTime scalar graphql-java/graphql-java-extended-scalars#7