时间类

[java]代码库

import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class DateTest {
	
	public static void main(String[] args) {
		Date d = new Date();
		Date nd = new Date(d.getTime()-1000*60*60*24);
		System.out.println(d);
		System.out.println(nd);
		System.out.println(d.before(nd));
		
		Date end = new Date();
		System.out.println(end.getTime()-d.getTime());
		
	}
}

DateFormat:

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

public class DateFormatTest {

	public static void main(String[] args)throws ParseException  {

		Date d = new Date();
		
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss") ;//可以有语言Locale.ENGLISH 
		System.out.println(format.format(d));
		
		format.applyPattern("EEE MM,dd,yyyy HH:mm:ss ");
		System.out.println(format.format(d));
		
		format.applyPattern("MM,dd,yy HH:mm:ss");
		System.out.println(format.format(d));
		
		Date d2 = format.parse("10,31,16 19:18:56");
		System.out.println(d2);
		
		SimpleDateFormat format2 = new SimpleDateFormat("EEE MM,dd,yyyy HH:mm:ss ", Locale.ENGLISH);
		System.out.println(format2.format(d));
		

import java.util.Calendar;

public class CalendarTest {

	public static void main (String[] args){

		Calendar c = Calendar.getInstance();
		
		c.set(2016, 7, 5, 22, 12, 1);
		System.out.println(c.getTime());
		System.out.println(c.get(Calendar.DAY_OF_WEEK));
		System.out.println(Calendar.MONDAY);
		System.out.println(c.get(Calendar.DAY_OF_YEAR));

		
		c.set(Calendar.MONTH, 8);
		c.set(Calendar.DAY_OF_MONTH, 31);
		System.out.println("after set date :  " + c.getTime());

		for (int i=0;i<50;i++) {
			c.roll(Calendar.DAY_OF_MONTH, true);
		}
		System.out.println("after roll :  " + c.getTime());
		
		for (int i=0;i<50;i++) {
			c.add(Calendar.DAY_OF_MONTH, 1);
		}
		System.out.println("after add 1 :  " + c.getTime());
		
		for (int i=0;i<50;i++) {
			c.add(Calendar.DAY_OF_MONTH, -1);
		}
		System.out.println("after add -1 :  " + c.getTime());
	}