时间工具类,DateUtil各种好用

package com.huxin.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

public class DateUtil {
private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");

private final static SimpleDateFormat sdfDay = new SimpleDateFormat(
"yyyy-MM-dd");

private final static SimpleDateFormat sdfDays = new SimpleDateFormat(
"yyyyMMdd");

private final static SimpleDateFormat sdfTime = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");

/**
* 获取YYYY格式
*
* @return
*/
public static String getYear() {
return sdfYear.format(new Date());
}

/**
* 获取YYYY-MM-DD格式
*
* @return
*/
public static String getDay() {
return sdfDay.format(new Date());
}

/**
* 获取YYYYMMDD格式
*
* @return
*/
public static String getDays(){
return sdfDays.format(new Date());
}

/**
* 获取YYYY-MM-DD HH:mm:ss格式
*
* @return
*/
public static String getTime() {
return sdfTime.format(new Date());
}

/**
* @Title: compareDate
* @Description: TODO(日期比较，如果s>=e 返回true 否则返回false)
* @param s
* @param e
* @return boolean
* @throws
* @author luguosui
*/
public static boolean compareDate(String s, String e) {
if(fomatDate(s)==null||fomatDate(e)==null){
return false;
}
return fomatDate(s).getTime() >=fomatDate(e).getTime();
}

/**
* 格式化日期
*
* @return
*/
public static Date fomatDate(String date) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
return fmt.parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}

/**
* 校验日期是否合法
*
* @return
*/
public static boolean isValidDate(String s) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
fmt.parse(s);
return true;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
return false;
}
}
public static int getDiffYear(String startTime,String endTime) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365);
return years;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
return 0;
}
}
/**
* <li>功能描述：时间相减得到天数
* @param beginDateStr
* @param endDateStr
* @return
* long
* @author Administrator
*/
public static long getDaySub(String beginDateStr,String endDateStr){
long day=0;
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
java.util.Date beginDate = null;
java.util.Date endDate = null;

try {
beginDate = format.parse(beginDateStr);
endDate= format.parse(endDateStr);
} catch (ParseException e) {
e.printStackTrace();
}
day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);
//System.out.println("相隔的天数="+day);

return day;
}

/**
* 得到n天之后的日期
* @param days
* @return
*/
public static String getAfterDayDate(String days) {
int daysInt = Integer.parseInt(days);

Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = sdfd.format(date);

return dateStr;
}

/**
* 得到n天之后是周几
* @param days
* @return
*/
public static String getAfterDayWeek(String days) {
int daysInt = Integer.parseInt(days);

Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdf = new SimpleDateFormat("E");
String dateStr = sdf.format(date);

return dateStr;
}

/*
* 获取n个月后的日期
*/
public static String getAfterMonthDate(String month) throws Exception {
int daysInt = Integer.parseInt(month);

//Calendar canlendar = Calendar.getInstance(); // java.util包
Calendar canlendar = Calendar.getInstance(); // java.util包
//canlendar.setTime(sdfTime.parse("1994-1-30 12:12:25"));
canlendar.add(Calendar.MONTH, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = sdfd.format(date);

return dateStr;
}

/**
n个月后的今天
*/
public static Date getAfterMonthBao(Date sj,int daysInt) throws Exception {
//Calendar canlendar = Calendar.getInstance(); // java.util包
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.setTime(sj);
canlendar.add(Calendar.MONTH, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
return date;
}

/**
* 得到n天之后的日期
* @param days
* @return
*/
public static String getAfterDay(String days) {
int daysInt = Integer.parseInt(days);

Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdfd.format(date);

return dateStr;
}

/**
* 获取当前时间 精确到小时
* @return
*/
public static String getPlanNumber()
{
//SimpleDateFormat sdfd = new SimpleDateFormat("yyyyMMddHHmmss");
SimpleDateFormat sdfd = new SimpleDateFormat("yyyyMMddHHmmss");
String dateStr = sdfd.format(new Date());
String rs=dateStr.substring(2,dateStr.length()-6);
return rs;
}

/**
* 格式化时间输出,短时间
* @param date
* @return
*/
public static String getDateWo(Date date){
return sdfDay.format(date);
}

/**
* 得到n天之后的日期的时间戳,短时间
* @param days
* @return  返回秒数
*/
public static int getAfterDayInt(String days) {
int daysInt = Integer.parseInt(days);

Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdfd.format(date);

return (int)(fomatDate(dateStr).getTime()/1000);
}

/**
* 得到n天之后的日期的时间戳,长时间
* @return  返回秒数
*/
public static int getToDayLong() {
return (int)(new Date().getTime()/1000);
}

/*
* 精确到天的秒数
*/
public static int getAddTimeInt(long t) {
try {
Date date=new Date(t*1000);
String now=sdfDay.format(date);
return (int)(sdfDay.parse(now).getTime()/1000);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}

/**
* 格式化日期
*
* @return  获得长时间精确到秒
*/
public static Date fomatDateLong(String date) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
try {
return fmt.parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}

/**
* 获取当前小时
* @return
*/
public static int getHour()
{
Calendar cal = Calendar.getInstance();
//int year = cal.get(Calendar.YEAR);//获取年份
//int month=cal.get(Calendar.MONTH);//获取月份
//int day=cal.get(Calendar.DATE);//获取日
int hour=cal.get(Calendar.HOUR_OF_DAY);//小时
//int minute=cal.get(Calendar.MINUTE);//分
//int second=cal.get(Calendar.SECOND);//秒
//int dayofweek = cal.get(Calendar.DAY_OF_WEEK);//一周的第几天
//if(1==1)
//return false;
//if(hour<9 || (hour >= 12 && hour <13 )  || hour >16)
// {
//     return true;
// }

return hour;
}

/*
* 获取n个月后的日期--精确到天
*/
public static String getAfterMonthDay(String month) throws Exception {
int daysInt = Integer.parseInt(month);
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.MONTH, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTi
4000
me();
String dateStr = sdfDay.format(date);
return dateStr;
}

/**
* 获取今天日期 yyyy-MM-dd
* @return
*/
public static Date getNow(){
return fomatDate(DateUtil.getDateWo(new Date()));
}

/*
* 将时间戳转换为字符串类型  yyyy年MM月dd
*/
public static String getDateStr(long time){
Date date=new Date(time);
SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy年MM月dd");
return sdfDay.format(date);
}

/**
* 得到n天之后的日期
* @param days
* @return
* @throws Exception
*/
public static Date getBeforeDayDate(int days) throws Exception {
int daysInt = days;
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdfd.format(date);
Date dateNow=sdfDay.parse(dateStr);
return dateNow;
}
/*
* 取整天的时间戳范围,精确到天
*/
public static int getDateToDayOneInt(){
String str=getDay();
Date dat=fomatDate(str);
return (int)(dat.getTime()/1000);
}

/**
* 精确到某一个的时间戳   yyyy-MM-dd
* @param date
* @return
*/
public static int StrDateToInt(String date){
try {
return (int)(sdfDay.parse(date).getTime()/1000);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}

/**
* 获取前几个月前几天的日期详情
* @param month 月数
* @param day  天数   + 往后   -往前
* @return  日期时间  yyyy-mm-dd
* @throws Exception
*/
public static Date getAfterMonthDay(int month,int day) throws Exception {
//Calendar canlendar = Calendar.getInstance(); // java.util包
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DAY_OF_MONTH, day);
canlendar.add(Calendar.MONTH, month); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
return fomatDate(sdfDay.format(date));
}

/**
* 获取前几个月前几天的日期详情
* @param month 月数
* @param day  天数   + 往后   -往前
* @return  日期时间  yyyy-mm-dd
* @throws Exception
*/
public static Date getAfterMonthDay(Date datePlan,int month,int day) throws Exception {
//Calendar canlendar = Calendar.getInstance(); // java.util包
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.setTime(datePlan);
canlendar.add(Calendar.DAY_OF_MONTH, day);
canlendar.add(Calendar.MONTH, month); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
return fomatDate(sdfDay.format(date));
}

/**
* 时间戳转换为时间字符串
* @param sec
* @return
*/
public static String int2LongDate(long sec){
Date date=new Date(sec*1000);
return sdfTime.format(date);
}

/**
* 获取本月的第一天
* @return
*/
public static String getTheMonthFirstDay(){
//获取当前月第一天：
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, 0);
//设置为1号,当前日期既为本月第一天
c.set(Calendar.DAY_OF_MONTH,1);
String first = sdfDay.format(c.getTime());
System.out.println("===============first:"+first);
return first;
}

/**
* 获取本月的最后一天
* @return
*/
public static String getTheMonthLastDay(){

//获取当前月最后一天
Calendar ca = Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH,
ca.getActualMaximum(Calendar.DAY_OF_MONTH));
String last = sdfDay.format(ca.getTime());
System.out.println("===============last:"+last);
return last;
}

/*
* 本月+1
*/
public static String toDayAddOneMonth() throws Exception{
return sdfDay.format(getAfterMonthBao(fomatDate(getTheMonthFirstDay()), 1));
}

/**
* 获取date+time合成之后的时间的时间戳
* @param planDate
* @param time
* @return
* @throws Exception
*/
public static int planDateAndDayTime(Date planDate,Date time) throws Exception{
String plan=sdfTime.format(planDate);
String day=sdfTime.format(time);

String start=plan.substring(0,day.indexOf(" "));
String end=day.substring(day.indexOf(" ")+1);

int ms=(int)(sdfTime.parse(start+" "+end).getTime()/1000);
return ms;

}

/*
* 设置指定小时的时间
*/
public static String sheHourTime(int hour){
Calendar c = Calendar.getInstance();
//设置为1号,当前日期既为本月第一天
c.set(Calendar.HOUR_OF_DAY,hour);
c.set(Calendar.MINUTE,0);
c.set(Calendar.SECOND,0);
String first = sdfTime.format(c.getTime());
return first;
}

/**
* 两个日期之间的天数差
* @param start
* @param end
* @return
*/
public static int getDaySubInt(long start,long end){
String str_begin=sdfDay.format(new Date(start*1000));
String str_end=sdfDay.format(new Date(end*1000));
return (int) getDaySub(str_begin,str_end);
}

//时间格式化 yyyy-MM-dd
public static String Date2Str(Date date){
return sdfDay.format(date);
}

/**
* 判断传递过来的日期是否是当天
*
* @param date
* @return
*/
public static boolean isCurrentDay(Date date) {
try {
String dateStr = sdfDay.format(date);
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date d = format.parse(dateStr);
return getNow().compareTo(d) == 0;
} catch (Exception e) {
return false;
}
}

/*
获取格式化时间
*/
public static String getDateStr(String dateTime){
String toDay="";
SimpleDateFormat geshi = new SimpleDateFormat("yyyy年MM月dd");
try {
toDay=geshi.format(sdfDay.parse(dateTime));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return toDay;
}

/*
2016年05月03 10:32
*/
public static String getDateStrMo(){
SimpleDateFormat sdf = new SimpleDateFormat(
"yyyy年MM月dd HH:mm");
return sdf.format(new Date());

}

public static int addYear(int daysInt){
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.YEAR, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdfd.format(date);
return DateUtil.StrDateToInt(dateStr);
}

public static int getAfterMonthDayInt(Date datePlan,int month,int day) throws Exception {
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.setTime(datePlan);
canlendar.add(Calendar.DAY_OF_MONTH, day);
canlendar.add(Calendar.MONTH, month); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
return (int)(date.getTime()/1000);
}

public static void main(String[] args) throws Exception{
/*
System.out.println(getDays());
System.out.println(getAfterDayWeek("3"));
System.out.println(getAfterMonthDate("1"));
System.out.println(getAfterMonthBao(new Date(), 2));
*/
System.out.println(getAfterDay("105"));
}

public static String dateToLLPayFormat(String s) {
SimpleDateFormat dataFormat = new SimpleDateFormat("yyyyMMddHHmmss",
Locale.getDefault());
if (s.length() == 10) {
return dataFormat.format(new Date(Long.valueOf(s + "000")));
} else {
return dataFormat.format(new Date(Long.valueOf(s + "000")));
}
}

public static String changeTimeZone(long time, String format) {
Date date = new Date(time);
SimpleDateFormat dateFormat = new SimpleDateFormat(format);//yyyyMMddHHmmss
dateFormat.setTimeZone(TimeZone.getTimeZone("GMT+08"));
String dateStrTmp = dateFormat.format(date);
return dateStrTmp;
}
}