Function again_at 

fn again_at(holds: &Holds, stamp: i64) -> i64

When a reminder held now may come: when the time now ends (waking, the end of free time, the hours’ end), a minute on at the soonest; while a layer holds it (a slot of time for you, do-not-disturb) or the end is unknown (a pause), at the next quarter of an hour (Unix seconds). In steps, never “a minute from now”: the list given to Java stays the same from one call to the next, so it is not given again, its alarms set again, every second.