Here you can find the source of dayOfWeek(final Date date)
public static int dayOfWeek(final Date date)
//package com.java2s; /*//from w ww. j av a 2 s . c o m * #%L * Webstar Newsletter * %% * Copyright (C) 2013 Webstar Csoport Kft. * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ import java.util.*; public class Main { public static int dayOfWeek(final Date date) { Calendar calendar = GregorianCalendar.getInstance(); calendar.setTime(date); int weekday = calendar.get(Calendar.DAY_OF_WEEK); return weekday; } }