Question about the find method inside timezone.js

Hi,
I have a question about the find function.
```
for (j = year + 1; j >= year - off; --j)
for (i = 0, I = rules.length; i < I; i++)
if (rules[i].from <= j && j <= rules[i].to) actualized.push(actualize(entry, rules[i], j));
else if (rules[i].to < j && off == 1) off = j - rules[i].to;
actualized.sort(function (a, b) { return a.sort - b.sort });
for (i = 0, I = actualized.length; i < I; i++) {
if (time >= actualized[i][clock] && actualized[i][actualized[i].clock] > entry[actualized[i].clock]) found = actualized[i];
}
```

So if year = 2017, it seems like the FOR statement is iterating all the years from 2018, 2017, 2016 ... to 2005. May I know why you need to do this, can we only iterate rules for year 2017 in this case?
Thanks!