Calendar calendar=Calendar.getInstance();//創(chuàng)建日期類
calendar.setTime(date);//獲取時(shí)間
int sumday=calendar.getActualMaximum(Calendar.DATE);//獲取當(dāng)月最大的天數(shù)

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 來初始化 Calendar 對(duì)象  
calendar.setTime(new Date());  

// setTime 類似上面一行  
// 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)以前察绷，后者大恬砂，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)以后蚜点，前者大搞动，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)轧抗，時(shí)間相同，顯示 0  
calendarNew.add(Calendar.HOUR, -2);  
System.out.println("時(shí)間比較：" + calendarNew.compareTo(calendar));  

}
}