Java 8 獲取某天最大(23:59:59)最小(00:00:00)時間

import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.util.Date;
 
public class GetMaxMinTime {
	public static void main(String[] args) {
		Date date = new Date();
		
		System.out.println("今天開始時間：" + getStartOfDay(date));
		System.out.println("今天結束時間：" + getEndOfDay(date));
		
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		
		System.out.println(sdf.format(getStartOfDay(date)));
		System.out.println(sdf.format(getEndOfDay(date)));
		
	}
	
	// 得到某天最大時間 2017-10-15 23:59:59
	public static Date getEndOfDay(Date date) {
		LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());;
		LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);
		return Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());
	}
	
	// 得到某天最小時間 2017-10-15 00:00:00
	public static Date getStartOfDay(Date date) {
		LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
		LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);
		return Date.from(startOfDay.atZone(ZoneId.systemDefault()).toInstant());
	}
 
}