最近在做判斷時間是今天，昨天，明天，在網上找了一個例子用的時候不怎麼對，特此出一個自己在之前網上例子中

修改的程式碼，不想去找原作者就此發一個部落格。

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class CalendarTest {

/**

* @param args

*/

public static void main(String[] args) {

String time = formatDateTime("2017-01-17 15:45:30"

System.out.println("time:"+time);

time = formatDateTime("2017-01-16 15:45:30");

System.out.println("time:"+time);

time = formatDateTime("2017-01-11 15:43:30");

System.out.println("time:"+time);

}

/**

* 格式化時間

* @param time

* @return

*/

private static String formatDateTime(String time) {

SimpleDateFormat format

if(time==null ||"".equals(time)){

return"";

}

Date date = null;

try {

date = format.parse(time);

} catch (ParseException e) {

e.printStackTrace();

}

Calendar current = Calendar.getInstance();

Calendar today = Calendar.getInstance();//今天

today

today.set(Calendar.MONTH, current.get(Calendar.MONTH));

today.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH));

//  Calendar.HOUR——12小時制的小時數 Calendar.HOUR_OF_DAY——24小時制的小時數

today.set( Calendar.HOUR_OF_DAY, 23);

today.set( Calendar.MINUTE, 59);

today.set(Calendar.SECOND, 59);

Calendar yesterday = Calendar.getInstance();//昨天

yesterday.set(Calendar.YEAR, current.get(Calendar.YEAR));

yesterday.set(Calendar.MONTH, current.get(Calendar.MONTH));

yesterday.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH)-1);

yesterday.set( Calendar.HOUR_OF_DAY, 23);

yesterday.set( Calendar.MINUTE, 59);

yesterday.set(Calendar.SECOND, 59);

current.setTime(date);

if(current.after(today)){

return "明天 "+time.split(" ")[1];

}else if(current.before(today) && current.after(yesterday)){

return "今天 "+time.split(" ")[1];

}else{

int index = time.indexOf("-")+1;

return "昨天 "+time.substring(index, time.length());

}

}

}