根据Unix时间戳计算时间，不分大小月，每月30天，每年按3

#include <iostream>
#include <stdio.h>
#include<stdlib.h>
#include<string>
using namespace std;

string fun(long long second)
{
	int year=1970;
	int month=1;
	int day=1;
	int hour=0;
	int minute=0;

	while(second>=60)
	{
		second-=60;
		++minute;
		if(minute == 60)
		{
			++hour;
			minute=0;
			if(hour==24)
			{
				++day;
				hour=0;
				if(day==31)
				{
					++month;
					day=1;
					if(month==13)
					{
						++year;
						month=1;
					}
				}
			}
		}

	}
	char buff[]="1970/01/01 00:00:00";
	sprintf(buff,"%d/%02d/%02d %02d:%02d:%02d",year,month,day,hour,minute,second);
	return buff;
}
int main()
{ 
	int n;
	cin>>n;
	long long *second = new long long[n];
	for(int i=0;i<n;++i)
	{
		cin>>second[i];
	}
	for(int i=0;i<n;++i)
	{
		cout<<fun(second[i])<<endl;
	}
	return 0;
}

 
#include <stdio.h>    int unix_date(){ int input; 
    scanf("%d", &input); int year, month, day, hour, minute, second;
    year = input/31104000;
    month = input%31104000/2592000;
    day = input%31104000%2592000/86400;
    hour = input%31104000%2592000%86400/3600;
    minute = input%31104000%2592000%86400%3600/60;
    second = input%31104000%2592000%86400%3600%60;

    printf("%04d/%02d/%02d %02d:%02d:%02d", 1970+year, 1+month, 1+day, hour, minute, second);  return 0;
} int main() {
    unix_date();  return 0;
}

package main

import (

    "fmt"

    "time"

)

func main() {

    fmt.Println("input the amout of inputs")

    n := 0

    fmt.Scanln(&n)

    for i := 0; i < n; i++ {

        fmt.Println("input the seconds")

        var m int

        fmt.Scanln(&m)

        a := time.Unix(int64(m), int64(0))

        fmt.Println(a)

    }

}

import java.util.Scanner;
public class Test {
    public static void main(String[] args) {
        long h = 61274880000L;     //1970年=61274880000秒
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入秒数:");
        int i = scan.nextInt();
        long sum = h + i;
        System.out.println((sum/31104000)+"/"+String.format("%02d",(sum%31104000)/2592000+1)+"/"+String.format("%02d",sum%2592000/86400+1)+" "+String.format("%02d",sum%86400/3600)+":"+String.format("%02d",sum%3600/60)+":"+String.format("%02d",sum%60));
    }
}

package test;
 
import java.util.Scanner;
 
public class Unix {
 
 public StringBuffer getUnix(int num) {
 StringBuffer unix = new StringBuffer();
 // 求秒数
 int n = num % 60;
 String ss = "";// 秒
 if (n == 0)
 ss = ":00";
 else if (n < 10 && n > 0)
 ss = ":0" + n;
 else
 ss = ":" + n;
 num = (num - n) / 60;
 // 求分钟数
 n = num % 60;
 String mm = "";// 分钟
 if (n == 0)
 mm = ":00";
 else if (n < 10 && n > 0)
 mm = ":0" + n;
 else
 mm = ":" + n;
 num = (num - n) / 60;
 // 求小时数
 n = num % 24;
 String HH = "";// 小时
 if (n == 0)
 HH = "00";
 else if (n < 10 && n > 0)
 HH = "0" + n;
 else
 HH = "" + n;
 num = (num - n) / 24;
 // 求天数
 n = num % 30;
 String dd = "";// 天数
 if (n == 0)
 dd = "/01";
 else if (n < 10 && n > 0)
 dd = "/0" + (n+1);
 else
 dd = "/" + (n+1);
 num = (num - n) / 30;
 // 求月数
 n = num % 12;
 String MM = "";// 天数
 if (n == 0)
 MM = "/01";
 else if (n < 10 && n > 0)
 MM = "/0" + (n+1);
 else
 MM = "/" + (n+1);
 num = (num - n) / 12;
 // 求年数
 String yyyy = "";// 年数
 n=num;
 if (n == 0)
 yyyy = "1970";
 else
 yyyy = "" + (n+1970);
 unix.append(yyyy).append(MM).append(dd).append(" ").append(HH).append(mm).append(ss);
 return unix;
 }
 
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 Scanner scanner = new Scanner(System.in);
 int n = scanner.nextInt();
 int a[] = new int[n];
 for (int i = 0; i < n; i++) {
 a[i] = scanner.nextInt();
 }
 Unix unix = new Unix();
 for (int i = 0; i < n; i++) {
 System.out.println(unix.getUnix(a[i]));
 }
 }
 
}