date-diff-partial-to-complete.js

function (birthMonth, birthDay, birthYear) {
        var todayDate = new Date(),
            todayYear = todayDate.getFullYear(),
            todayMonth = todayDate.getMonth(),
            todayDay = todayDate.getDate(),
            age = todayYear - birthYear.date;

        if (todayMonth < birthMonth.date - 1) {
            age--;
        }

        if (birthMonth.date - 1 === todayMonth && todayDay < birthDay.date) {
            age--;
        }

        return $scope.age = age;
    };

@jgwill can you check it