Macro icu_calendar::types::dt_unit

macro_rules! dt_unit {
    ($name:ident, $storage:ident, $value:expr, $docs:expr) => { ... };
}

This macro defines a struct for 0-based date fields: hours, minutes, seconds and fractional seconds. Each unit is bounded by a range. The traits implemented here will return a Result on whether or not the unit is in range from the given input.