Java 8 獲取某天最大(23:59:59)最小(00:00:00)時間的介紹

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)));
        
    }
    
    // 獲得某天最大時間 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());
    }
    
    // 獲得某天最小時間 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());
    }

}