Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright 2012 Sorin Otescu <sorin.otescu@gmail.com>
 * 
 * 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 static Date startOfThisMonth(int startDayOfMonth) {
        Calendar cal = Calendar.getInstance();

        if (cal.get(Calendar.DATE) < startDayOfMonth) // the start is startDayOfMonth, last month
            cal.add(Calendar.MONTH, -1);

        int lastDayInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

        if (startDayOfMonth <= lastDayInMonth)
            cal.set(Calendar.DATE, startDayOfMonth);
        else {
            cal.add(Calendar.MONTH, 1);
            cal.set(Calendar.DATE, 1);
        }

        return startOfDay(cal.getTime());
    }

    public static Date startOfDay(Date origDate) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(origDate);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }
}