bug fix for month increment - February is going amiss in some cases.

[yashwanthm]

The month increment decrement operator is buggy and this should help increment the month correctly.
February as a month doesn't get constructed in some cases when done this way:

if (isFutureDate) {
 monthIterator.setMonth(monthIterator.getMonth() + 1);
} else {
 monthIterator.setMonth(monthIterator.getMonth() - 1);
}

This should take care of it correctly.

if (isFutureDate) {
 monthIterator.setMonth(monthIterator.getMonth() + 1, 1);
} else {
 monthIterator.setMonth(monthIterator.getMonth() - 1, 1);
}