Here you can find the source of isJulianLeapYear(int normalizedJulianYear)
public static final boolean isJulianLeapYear(int normalizedJulianYear)
//package com.java2s; //License from project: Mozilla Public License public class Main { public static final boolean isJulianLeapYear(int normalizedJulianYear) { return (normalizedJulianYear % 4) == 0; }//from w w w . j a v a 2 s. com }