Macro date

macro_rules! date {
    ($year:literal - $month:literal - $day:literal) => { ... };
}

👎Deprecated: Cannot be supported on Rust 1.31

Declare a Date using the YYYY-MM-DD format (ISO 8601).

This is deprecated, because it cannot be implemented on Rust 1.31 and the whole point of the crate is supporting old versions.