/*
* 日期格式 類 SimpleDateFormat
* 日期類 Date
* 日曆類 Calendar
*/
import java.text.SimpleDateFormat;
import java.util.Date;
public class MyDate {
public static void main(String[] args) {
Date date=new Date();
System.out.println(date);
System.out.println(date.getYear()+1900);
System.out.println(date.getMonth());
System.out.println(date.getDate());
System.out.println(date.getHours());
System.out.println(date.getSeconds());
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss: EEE");
System.out.println(sdf.format(date));
//format 格式 使格式化
}
}
/*
* Calendar 日曆類
*/
import java.text.ParseException;import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class MyCalendar {
public static void main(String[] args) {
Calendar cd=Calendar.getInstance();
/*
*
Calendar.getInstance()的解釋
Gets a calendar using the default time zone and locale.
The Calendar returned is based on the current time in the default time zone with the default FORMAT locale.
Returns:a Calendar.
*/
System.out.println(cd);
System.out.println(cd.get(Calendar.YEAR));
System.out.println(cd.get(Calendar.MONTH)+1);//0~11表示 1~12月份
System.out.println(cd.get(Calendar.DATE));
System.out.println(cd.get(Calendar.HOUR));
System.out.println(cd.get(Calendar.MINUTE));
System.out.println(cd.get(Calendar.SECOND));
//long num=14702311004531;
//System.out.println(new Date(num));
//求20分鐘後的日期
cd.add(Calendar.MINUTE,20 );
System.out.println(cd);
//將一個日曆轉成一個Date
Date date=cd.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss:SS: EEE");
System.out.println(sdf.format(date));
//2016-08-03 21:46 2016-08-05 11:23 求出這;兩個時間之間相差的小時 以及相差的分鐘
SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd HH:mm");//指定給定的日期字符串格式
try {
Date d1=sdf1.parse("2016-08-03 21:46");//將給定的字符串變成一個日期對象
Date d2=sdf1.parse("2016-08-05 11:23");
System.out.println(Math.abs(Math.floor(d1.getTime()-d2.getTime())/1000/60/60));
System.out.println(Math.abs(Math.floor(d1.getTime()-d2.getTime())/1000/60));
//將日期轉化成日曆
cd.setTime(d2);
System.out.println(cd);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}