Function day_view 

fn day_view(
    health: &Health,
    state: &HealthState,
    records: &DoseRecords,
    knowledge: &Knowledge,
    days: &Days,
    around: &Around<'_>,
    date: Date,
    now: &Zoned,
) -> DayView

One day: its list (blocks, those taken out that day, its doses) and what its column draws.