Java获取当天的起始时间和结束时间

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
 
public class Test {
 
	public static void main(String[] args) throws Exception {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		System.out.println(sdf.format(getStartTime()));
		System.out.println(sdf.format(getEndTime()));
	}
 
	private static Date getStartTime() {
		Calendar todayStart = Calendar.getInstance();
		todayStart.set(Calendar.HOUR, 0);
		todayStart.set(Calendar.MINUTE, 0);
		todayStart.set(Calendar.SECOND, 0);
		todayStart.set(Calendar.MILLISECOND, 0);
		return todayStart.getTime();
	}
 
	private static Date getEndTime() {
		Calendar todayEnd = Calendar.getInstance();
		todayEnd.set(Calendar.HOUR, 23);
		todayEnd.set(Calendar.MINUTE, 59);
		todayEnd.set(Calendar.SECOND, 59);
		todayEnd.set(Calendar.MILLISECOND, 999);
		return todayEnd.getTime();
	}
}

运行结果：

2020-10-14 12:00:00
2020-10-15 11:59:59