Here you can find the source of month(final Date date)
public static int month(final Date date)
//package com.java2s; //License from project: Apache License import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import static java.util.Calendar.*; public class Main { /**/*from w w w . j a v a 2 s . c om*/ * Returns the month from the day, i.e. a number between 1 (January) and 12 (December). */ public static int month(final Date date) { return fromDateToCalendar(date).get(MONTH) + 1; } public static Calendar fromDateToCalendar(final Date date) { final Calendar cal = new GregorianCalendar(); cal.clear(); cal.setMinimalDaysInFirstWeek(4); cal.setFirstDayOfWeek(Calendar.MONDAY); cal.setTime(date); return cal; } }