Calculate seconds til the next time the clock strikes n

seconds_til.nut

function secondsTil(now,targetTime) {
    local data = split(targetTime,":");
    local target = { hour = data[0].tointeger(), min = data[1].tointeger() };
    
    if ((target.hour < now.hour) || (target.hour == now.hour && target.min < now.min)) {
        target.hour += 24;
    }
    
    local secondsTill = 0;
    secondsTill += (target.hour - now.hour) * 3600;
    secondsTill += (target.min - now.min) * 60;
    return secondsTill;
}