pub const DATETIME_FORMAT: &str = "%Y-%m-%dT%H:%M";Expand description
The wire format a FieldKind::DateTime value takes: YYYY-MM-DDTHH:MM,
local, carrying no zone and no seconds.
DATE_FORMAT’s sibling and there for its reason. The absent zone is a
property of the value rather than an omission: the moment is not fixed until
something outside the description supplies one.