package com.guanlan.layout.txz.util;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

* Created by qwerthink on 2017/3/30.

*/

public class DateUtil {

private static SimpleDateFormat sdf=new SimpleDateFormat("yyyyMM");

private static Calendar calendar=Calendar.getInstance();

/*

输入日期字符串比如201703，返回当月第一天的Date

*/

public static Date getMinDateMonth(String month){

try {

Date nowDate=sdf.parse(month);

calendar = Calendar.getInstance();

calendar.setTime(nowDate);

calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));

return calendar.getTime();

} catch (ParseException e) {

e.printStackTrace();

}

return null;

}

/*

输入日期字符串，返回当月最后一天的Date

*/

public static Date getMaxDateMonth(String month){

try {

Date nowDate=sdf.parse(month);

calendar = Calendar.getInstance();

calendar.setTime(nowDate);

calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));

return calendar.getTime();

} catch (ParseException e) {

e.printStackTrace();

}

return null;

}

public static void main(String[] args) throws ParseException{

String month="201705";

System.out.println(getMinDateMonth(month));

System.out.println(getMaxDateMonth(month));

}

}