Here you can find the source of yesterday()
public static String yesterday()
//package com.java2s; /*// w w w. j av a2s . c o m * (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 { public static String yesterday() { Date td = new Date(); Date tmr = new Date(td.getTime() - 86400000L); String tomorrow = tmr.toLocaleString().split(" ")[0]; String tArr[] = tomorrow.split("-"); if (tArr[1].length() < 2) tArr[1] = (new StringBuffer("0")).append(tArr[1]).toString(); if (tArr[2].length() < 2) tArr[2] = (new StringBuffer("0")).append(tArr[2]).toString(); return (new StringBuffer(String.valueOf(tArr[0]))).append("-").append(tArr[1]).append("-").append(tArr[2]) .toString(); } }