Here you can find the source of dayOfWeek(String pFormerStr)
public static int dayOfWeek(String pFormerStr)
//package com.java2s; /*// ww w .jav a 2s .c om * (C) 2013-2015 Asiainfo-linkage Group Holding Limited. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * Authors: * davylin<linjxljx@gmail.com> */ import java.util.*; public class Main { static StringTokenizer sToken; public static int dayOfWeek(String pFormerStr) { GregorianCalendar vTodayCal = parse2Cal(pFormerStr); return vTodayCal.get(7); } public static int dayOfWeek(Date date) { GregorianCalendar gc = new GregorianCalendar(); gc.setTime(date); return gc.get(7); } public static GregorianCalendar parse2Cal(String pDateStr) { sToken = new StringTokenizer(pDateStr, "-/"); int vYear = Integer.parseInt(sToken.nextToken()); int vMonth = Integer.parseInt(sToken.nextToken()) - 1; int vDayOfMonth = Integer.parseInt(sToken.nextToken()); return new GregorianCalendar(vYear, vMonth, vDayOfMonth); } }