Day of the Year

day-of-the-year.java

class Solution {
    public int dayOfYear(String date) {
        int[] daysOfTheMonth = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        int days = 0;
        String[] split = date.split("-");
        int year = Integer.valueOf(split[0]);
        int month = Integer.valueOf(split[1]);
        int day = Integer.valueOf(split[2]);
        for (int i = 0 ; i < month - 1; i++) {
            days += daysOfTheMonth[i];
        }
        days += day;
        if (isLeapYear(year) && month > 2) {
            days++;
        }
        return days;
    }
    
    private boolean isLeapYear(int year) {
        return year % 400 == 0 || ( year % 4 == 0 && year % 100 != 0); 
    }
}