博客

package com.wonders.api.date;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

/**
 * JDK1.7
 * GregorianCalendar类
 * (1)GregorianCalendar是一个具体的日历子类，它提供了大多数世界使用的标准日历系统
 * (2)GregorianCalendar是一个混合日历，它支持Julian和Gregorian的日历系统，支持单一的不连续性，它对应于公历在公历建立时(在某些国家的1582年10月15日，后来在其他国家)的公历日期。
 * (3)通过调用setGregorianChange()可以对日期进行转换。
 * @author liyongyong
 *
 */
public class GregorianCalendarTest {

	public static void main(String[] args) {
		GregorianCalendar g = new GregorianCalendar();
		/**
		 * 
		 */
		System.out.println(g.getTimeZone());
		//得到太平洋所支持的标准时间GMT-08:00的ids
		String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000);
		//如果数组为空，则说明不存在对应的ids
		if (ids.length == 0) {
			System.out.println("不存在对应的ids");
		}
		System.out.println("current time");
		//创建一个太平洋标准时间时区
		SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);
		pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
		pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
		//创建一个与太平洋夏令时区域的GregorianCalendar ,设置当前的日期和时间
		Calendar calendar = new GregorianCalendar(pdt);
		Date trialTime = new Date();
		calendar.setTime(trialTime);
		
		 //输出一些信息
		 System.out.println("ERA: " + calendar.get(Calendar.ERA));
		 System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
		 System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
		 System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
		 System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
		 System.out.println("DATE: " + calendar.get(Calendar.DATE));
		 System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
		 System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR));
		 System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
		 System.out.println("DAY_OF_WEEK_IN_MONTH: "
		                    + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
		 System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
		 System.out.println("HOUR: " + calendar.get(Calendar.HOUR));
		 System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
		 System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
		 System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
		 System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
		 System.out.println("ZONE_OFFSET: "
		                    + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
		 System.out.println("DST_OFFSET: "
		                    + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
	
		 System.out.println("Current Time, with hour reset to 3");
		 calendar.clear(Calendar.HOUR_OF_DAY); // 没有被重写
		 calendar.set(Calendar.HOUR, 3);
		 System.out.println("ERA: " + calendar.get(Calendar.ERA));
		 System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
		 System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
		 System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
		 System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
		 System.out.println("DATE: " + calendar.get(Calendar.DATE));
		 System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
		 System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR));
		 System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
		 System.out.println("DAY_OF_WEEK_IN_MONTH: "
		                    + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
		 System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
		 System.out.println("HOUR: " + calendar.get(Calendar.HOUR));
		 System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
		 System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
		 System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
		 System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
		 System.out.println("ZONE_OFFSET: "
		        + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // 小时
		 System.out.println("DST_OFFSET: "
		        + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // 小时
	}

}