Here you can find the source of addTime(Date date, int field, int value)
public final static Date addTime(Date date, int field, int value)
//package com.java2s; /*//from ww w . ja v a2 s . c o m * Copyright Bruce Liang (ldcsaa@gmail.com) * * Version : Log-Cutter 2.0.2 * Author : Bruce Liang * Website : http://www.jessma.org * Project : https://github.com/ldcsaa * Blog : http://www.cnblogs.com/ldcsaa * WeiBo : http://weibo.com/u/1402935851 * QQ Group : 75375912 * * 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. */ import java.util.Calendar; import java.util.Date; public class Main { public final static Date addTime(Date date, int field, int value) { return addTime(date, field, value, false); } public final static Date addTime(Date date, int field, int value, boolean trimTime) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(field, value); if (trimTime) { c.set(Calendar.HOUR, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); c.set(Calendar.MILLISECOND, 0); } return c.getTime(); } }