package demo; 
 
import java.util.Date; 
import java.text.SimpleDateFormat; 
import java.text.DateFormat; 
import java.text.ParseException; 
import java.util.Calendar; 
 
public class Test 
{ 
 public Test() 
 { 
 } 
 
 public static void main(String[] args) 
 { 
 // 字符串轉(zhuǎn)換日期格式 
 // DateFormat fmtDateTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
 // 接收傳入?yún)?shù) 
 // String strDate = args[1]; 
 // 得到日期格式對(duì)象 
 // Date date = fmtDateTime.parse(strDate); 
 
 // 完整顯示今天日期時(shí)間 
 String str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS")).format(new Date()); 
 System.out.println(str); 
 
 // 創(chuàng)建 Calendar 對(duì)象 
 Calendar calendar = Calendar.getInstance(); 
 
 try 
 { 
  // 對(duì) calendar 設(shè)置時(shí)間的方法 
  // 設(shè)置傳入的時(shí)間格式 
  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-M-d H:m:s"); 
  // 指定一個(gè)日期 
  Date date = dateFormat.parse("2013-6-1 13:24:16"); 
  // 對(duì) calendar 設(shè)置為 date 所定的日期 
  calendar.setTime(date); 
 
  // 按特定格式顯示剛設(shè)置的時(shí)間 
  str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS")).format(calendar.getTime()); 
  System.out.println(str); 
 } 
 catch (ParseException e) 
 { 
  e.printStackTrace(); 
 } 
 
 // 或者另一種設(shè)置 calendar 方式 
 // 分別爲(wèi) year, month, date, hourOfDay, minute, second 
 calendar = Calendar.getInstance(); 
 calendar.set(2013, 1, 2, 17, 35, 44); 
 str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS")).format(calendar.getTime()); 
 System.out.println(str); 
 
 // Calendar 取得當(dāng)前時(shí)間的方法 
 // 初始化 (重置) Calendar 對(duì)象 
 calendar = Calendar.getInstance(); 
 // 或者用 Date 來(lái)初始化 Calendar 對(duì)象 
 calendar.setTime(new Date()); 
 
 // setTime 類(lèi)似上面一行 
 // Date date = new Date(); 
 // calendar.setTime(date); 
 
 str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS")).format(calendar.getTime()); 
 System.out.println(str); 
 
 // 顯示年份 
 int year = calendar.get(Calendar.YEAR); 
 System.out.println("year is = " + String.valueOf(year)); 
 
 // 顯示月份 (從0開(kāi)始, 實(shí)際顯示要加一) 
 int month = calendar.get(Calendar.MONTH); 
 System.out.println("nth is = " + (month + 1)); 
 
 // 本周幾 
 int week = calendar.get(Calendar.DAY_OF_WEEK); 
 System.out.println("week is = " + week); 
 
 // 今年的第 N 天 
 int DAY_OF_YEAR = calendar.get(Calendar.DAY_OF_YEAR); 
 System.out.println("DAY_OF_YEAR is = " + DAY_OF_YEAR); 
 
 // 本月第 N 天 
 int DAY_OF_MONTH = calendar.get(Calendar.DAY_OF_MONTH); 
 System.out.println("DAY_OF_MONTH = " + String.valueOf(DAY_OF_MONTH)); 
 
 // 3小時(shí)以后 
 calendar.add(Calendar.HOUR_OF_DAY, 3); 
 int HOUR_OF_DAY = calendar.get(Calendar.HOUR_OF_DAY); 
 System.out.println("HOUR_OF_DAY + 3 = " + HOUR_OF_DAY); 
 
 // 當(dāng)前分鐘數(shù) 
 int MINUTE = calendar.get(Calendar.MINUTE); 
 System.out.println("MINUTE = " + MINUTE); 
 
 // 15 分鐘以后 
 calendar.add(Calendar.MINUTE, 15); 
 MINUTE = calendar.get(Calendar.MINUTE); 
 System.out.println("MINUTE + 15 = " + MINUTE); 
 
 // 30分鐘前 
 calendar.add(Calendar.MINUTE, -30); 
 MINUTE = calendar.get(Calendar.MINUTE); 
 System.out.println("MINUTE - 30 = " + MINUTE); 
 
 // 格式化顯示 
 str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SS")).format(calendar.getTime()); 
 System.out.println(str); 
 
 // 重置 Calendar 顯示當(dāng)前時(shí)間 
 calendar.setTime(new Date()); 
 str = (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SS")).format(calendar.getTime()); 
 System.out.println(str); 
 
 // 創(chuàng)建一個(gè) Calendar 用于比較時(shí)間 
 Calendar calendarNew = Calendar.getInstance(); 
 
 // 設(shè)定為 5 小時(shí)以前，后者大，顯示 -1 
 calendarNew.add(Calendar.HOUR, -5); 
 System.out.println("時(shí)間比較：" + calendarNew.compareTo(calendar)); 
 
 // 設(shè)定7小時(shí)以后，前者大，顯示 1 
 calendarNew.add(Calendar.HOUR, +7); 
 System.out.println("時(shí)間比較：" + calendarNew.compareTo(calendar)); 
 
 // 退回 2 小時(shí)，時(shí)間相同，顯示 0 
 calendarNew.add(Calendar.HOUR, -2); 
 System.out.println("時(shí)間比較：" + calendarNew.compareTo(calendar)); 
 } 
} 

// 得微秒級(jí)時(shí)間差 
long val = calendarEnd.getTimeInMillis() - calendarBegin.getTimeInMillis(); 
// 換算后得到天數(shù) 
long day = val / (1000 * 60 * 60 * 24);