經常看到社交類app中關於動態釋出的時間點與當前時間的換算，說麻煩也不麻煩，說簡單也不簡單，只是計算起來有點繞。如以當前時間為基準，自己某個時間在微博上發表一個動態，發表時間提示有多種顯示，如剛剛、幾分鐘前、幾個小時前、昨天、前天、日期等等。自己之前做過類似的時間換算，雖然不是最優，但最終效果還是達到了，下面附上原始碼

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;


public class TestDate {
	
	/** 準備第一個模板，從字串中提取出日期數字  */
	private static String pat1 = "yyyy-MM-dd HH:mm:ss" ;  
	/** 準備第二個模板，將提取後的日期數字變為指定的格式*/  
	private static String pat2 = "yyyy年MM月dd日 HH:mm:ss" ;
	/** 例項化模板物件*/  
	private static SimpleDateFormat sdf1 = new SimpleDateFormat(pat1) ;         
	private static SimpleDateFormat sdf2 = new SimpleDateFormat(pat2) ;
	public static void main(String[] args) {
		Date dates = Dates();
		String string = sdf1.format(dates);
		System.out.println(string);
		String time = "2013-01-29 19:38:21"; 
		System.out.println(getTime(time));
	}
	
	public static Long farmatTime(String string){
		Date date =null;
		try {
			SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			date = Date(sf.parse(string));
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return date.getTime();
	}
	
	public static Date Date(Date date){
		Date datetimeDate;
		datetimeDate = new Date(date.getTime());
		return datetimeDate;
	}
	public static Date Dates(){
		Date datetimeDate;
		Long dates  = 1361515285070L;
		datetimeDate = new Date(dates);
		return datetimeDate;
	}
	
	public static String getTime(String commitDate) {
		// TODO Auto-generated method stub
		// 在主頁面中設定當天時間
		Date nowTime = new Date();
        String currDate = sdf1.format(nowTime);
        Date date = null ;  
        try{  
        	// 將給定的字串中的日期提取出來  
        	date = sdf1.parse(commitDate) ;   
        }catch(Exception e){            
            e.printStackTrace() ;        
        }  
		int nowDate = Integer.valueOf(currDate.substring(8, 10));
		int commit = Integer.valueOf(commitDate.substring(8, 10));
        String monthDay = sdf2.format(date).substring(5, 12);
        String yearMonthDay = sdf2.format(date).substring(0, 12);
        int month = Integer.valueOf(monthDay.substring(0, 2));
        int day = Integer.valueOf(monthDay.substring(3, 5));
        if (month < 10 && day <10) {
			monthDay = monthDay.substring(1, 3) + monthDay.substring(4);
        }else if(month < 10){
			monthDay = monthDay.substring(1);
		}else if (day < 10) {
			monthDay = monthDay.substring(0, 3) + monthDay.substring(4);
		}
        int yearMonth = Integer.valueOf(yearMonthDay.substring(5, 7));
        int yearDay = Integer.valueOf(yearMonthDay.substring(8, 10));
        if (yearMonth < 10 && yearDay <10) {
        	yearMonthDay = yearMonthDay.substring(0, 5) + yearMonthDay.substring(6,8) + yearMonthDay.substring(9);
        }else if(yearMonth < 10){
        	yearMonthDay = yearMonthDay.substring(0, 5) + yearMonthDay.substring(6);
        }else if (yearDay < 10) {
        	yearMonthDay = yearMonthDay.substring(0, 8) + yearMonthDay.substring(9);
        }
		String str = " 00:00:00";
		float currDay = farmatTime(currDate.substring(0, 10) + str);
		float commitDay = farmatTime(commitDate.substring(0, 10) +str);
		int currYear = Integer.valueOf(currDate.substring(0, 4));
		int commitYear = Integer.valueOf(commitDate.substring(0, 4));
		int flag = (int)(farmatTime(currDate)/1000 - farmatTime(commitDate)/1000);
		String des = null;
		String hourMin = commitDate.substring(11, 16);
		int temp = flag;
		if (temp < 60) {
			System.out.println("A");
			if (commitDay < currDay) {
				des = "昨天  " + hourMin;
			}else {
				des = "剛剛";
			}
		}else if (temp < 60 * 60) {
			System.out.println("B");
			if (commitDay < currDay) {
				des = "昨天  " + hourMin;
			}else {
				des = temp/60 + "分鐘以前";
			}
		}else if(temp< 60*60*24){
			System.out.println("C");
			int hour = temp / (60*60);
			if (commitDay < currDay) {
				des = "昨天  " + hourMin;
			}else {
				if (hour < 6) {
					des = hour + "小時前";
				}else {
					des = hourMin;
				}
			}
		}else if (temp < (60 * 60 * 24 *2 )) {
			System.out.println("D");
			if (nowDate - commit == 1) {
				des = "昨天  " + hourMin;
			}else {
				des = "前天  " + hourMin;
			}
		}else if (temp < 60 * 60 * 60 * 3) {
			System.out.println("E");
			if (nowDate - commit == 2) {
				des = "前天  " + hourMin;
			}else {
				if (commitYear < currYear) {
					des = yearMonthDay + hourMin;
				}else {
					des = monthDay + hourMin;
				}
			}
		}else {
			System.out.println("F");
			if (commitYear < currYear) {
				des = yearMonthDay + hourMin;
			}else {
				des = monthDay + hourMin;
			}
		}
		if (des == null) {
			des = commitDate;
		}
		return des;
	}
	
	public static Date Date(){
		Date datetimeDate;
		Long dates  = 1361514787384L;
		datetimeDate = new Date(dates);
		return datetimeDate;
	}

}
 

 執行結果：

2013-01-29 19:38:21  轉換結果

下圖為新浪關於時間顯示效果圖