Function given_times 

pub fn given_times<'a>(
    tasks: &'a [Task],
    today: Date,
    zone: &TimeZone,
) -> Vec<(&'a Task, i64)>

Times given by a drag before blocks (X-SIOUL-AT) still to honour, each to become a block once: an open task’s, for today or later, as (task, its start in Unix seconds), in zone.