获取今天最后时间和开始时间，比较与当前时间的大小

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_36135928/article/details/84500841

package cn.iponkan;

import static org.junit.Assert.*;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.junit.Test;

/**
 * @author ClareTung
 *
 */
public class DateTest {
	
	static Date now;
	static {
		now = new Date();
	}

	/**
	 * 获取今天的最后时间 23:59:59
	 */
	public Date getLastTimeOfToday() {
		Calendar todayEnd = Calendar.getInstance();  
        todayEnd.set(Calendar.HOUR_OF_DAY, 23);  
        todayEnd.set(Calendar.MINUTE, 59);  
        todayEnd.set(Calendar.SECOND, 59);  
        todayEnd.set(Calendar.MILLISECOND, 999);  
        return todayEnd.getTime(); 
	}
	
	/**
	 * 获取今天的开始时间 00:00:00
	 * @return
	 */
	public Date getStartTimeOfToday() {
		Calendar todayStart = Calendar.getInstance();  
        todayStart.set(Calendar.HOUR_OF_DAY, 0);  
        todayStart.set(Calendar.MINUTE, 0);  
        todayStart.set(Calendar.SECOND, 0);  
        todayStart.set(Calendar.MILLISECOND, 0);  
        return todayStart.getTime();
	}
	
	
	/**
	 * 测试获取今天最后的时间，比较与当前时间的大小
	 */
	@Test
	public void testGetLastTimeOfToday() {
		String lastTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(getLastTimeOfToday());
		assertEquals(lastTime,"2018-11-25 23:59:59");
		assertTrue(now.getTime() < getLastTimeOfToday().getTime());
	}
	
	/**
	 * 测试获取今天开始的时间，比较与当前时间的大小
	 */
	@Test
	public void testGetStartTimeOfToday() {
		String startTime =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(getStartTimeOfToday());
		assertEquals(startTime,"2018-11-25 00:00:00");
		assertTrue(now.getTime() > getStartTimeOfToday().getTime());
	}
}