refactor date parsing to validate months outside 1-12 range

[ForestJohnson]

Fixes #70

Code pulled from bwendt-mylo@f59b34a

all tests passing

[ForestJohnson]

The logic that compares teh two dateInfos (from bwendt-mylo@f59b34a) was flawed because it would fail on dates that have time zone offsets due to the way that fecha / JS standard library handles time zones. So i replaced it with

  if(dateInfo.day != null && dateInfo.day < 1 || dateInfo.day > 32) {
    return false;
  }
  if(dateInfo.month != null && dateInfo.month < 0 || dateInfo.month > 11) {
    return false;
  }
  return true;

which is the simplest shortest way of achieving my goal.

[taylorhakes]

I have fixed this issue in this PR #72

[ForestJohnson]

💯