Calendar日历函数

package date;

import java.util.Calendar;
import java.util.Date;

public class CalendarDemo {
	public static void main(String[] args) {
		
		// 初始化日历
		Calendar calendar = Calendar.getInstance();
		
		// 当前时间初始化日历时间
		calendar.setTime(new Date());
		
		// 获取年
		String year = String.valueOf(calendar.get(Calendar.YEAR));
		
		// 获取月
		String month = String.valueOf(calendar.get(Calendar.MONTH)+1);
		
		// 获取日
		String date = String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));
		
		// 获取星期
		String week = String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);
		
		// 获取时
		int hour = calendar.get(Calendar.HOUR_OF_DAY);
		
		// 获取分
		int minute = calendar.get(Calendar.MINUTE);
		
		// 获取秒
		int seconds = calendar.get(Calendar.SECOND);
		
		System.out.println("现在的时间是 ");
		System.out.println(year+'-'+month+'-'+date+"  "+hour+':'+minute+":"+seconds);
		System.out.println("星期"+week);
		
		// 日历翻到2008.10.01
		calendar.set(2008, 9, 1);
		long time2008 = calendar.getTimeInMillis();
		
		// 日历翻到2017.10.01
		calendar.set(2017, 9, 1);
		long time2017 = calendar.getTimeInMillis();
		
		// 相隔天数
		long allday = (time2017-time2008)/(1000*60*60*24);
		System.out.println("2008.10.01和2017.10.01相隔"+allday+"天");
	}
}