Java时间工具类-获取一天的起始与结束时间

package com.crt.settlement.Datasource.common.utils;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class DateUtil {
    /*
     * 获取昨天的时间
     */
    public static Date getYesterdayDate(){
        Date date=new Date();//取时间
         Calendar calendar = new GregorianCalendar();
         calendar.setTime(date);
         calendar.add(calendar.DATE,-1);//把日期往后增加一天.整数往后推,负数往前移动
         return calendar.getTime();
    }
    public static Calendar getYesterdayCalendar(){
        Date date=new Date();//取时间
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        calendar.add(calendar.DATE,-1);//把日期往后增加一天.整数往后推,负数往前移动
        return calendar;
    }
    /*
     * 获取明天的时间
     */
    public static Date getTomorrowDate(){
        Date date=new Date();//取时间
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        calendar.add(calendar.DATE,1);//把日期往后增加一天.整数往后推,负数往前移动
        return calendar.getTime();
    }
    public static Calendar getTomorrowCalendar(){
        Date date=new Date();//取时间
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        calendar.add(calendar.DATE,1);//把日期往后增加一天.整数往后推,负数往前移动
        return calendar;
    }
    /*
     * 获取当前天的起始时间
     */
    public static Date getStartTime(Calendar day) {   
        day.set(Calendar.HOUR_OF_DAY, 0); 
        day.set(Calendar.MINUTE, 0);  
        day.set(Calendar.SECOND, 0);  
        day.set(Calendar.MILLISECOND, 0);  
        return day.getTime();  
    }  
    /*
     * 获取当前天的结束时间
     */
    public static Date getEndTime(Calendar day) {  
        day.set(Calendar.HOUR_OF_DAY, 23);  
        day.set(Calendar.MINUTE, 59);  
        day.set(Calendar.SECOND, 59);  
        day.set(Calendar.MILLISECOND, 999);  
        return day.getTime();  
    } 
}