根据Long类型时间戳获取当前年份并得到当前年份最后一天的时间戳

package com.it.test;

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

public class Timer2Test {
    public static void main(String[] args) {
        Date date = new Date(1578021723000L);//传过来的具体时间的时间戳
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");
        String format = simpleDateFormat.format(date);
        Integer year = Integer.valueOf(format);
        System.out.println(year);
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        calendar.roll(Calendar.DAY_OF_YEAR, -1);
        long timeInMillis = calendar.getTimeInMillis();
        System.out.println(timeInMillis);

        //时间戳转成String类型的时间
        SimpleDateFormat simpleDateFormat2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date2 = new Date(timeInMillis); 
        String format1 = simpleDateFormat2.format(date2);//将时间调整为yyyy-MM-dd HH:mm:ss时间样式
        System.out.println("时间戳转成format"+format1);
    }
}

结果