Question

我无法为Java时间戳添加秒数。

我有这个，但是，它给了我相同的日期：

int sec = 600;

java.sql.Timestamp ts_from_ws = new java.sql.Timestamp(retry_date);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(ts_from_ws.getTime());
cal.add(Calendar.SECOND,sec);
java.sql.Timestamp ts_new_date_ws = new java.sql.Timestamp(cal.getTime().getTime());

Answer 1

你得到的代码对我有用。作为一个简短但完整的计划：

import java.util.*;
import java.sql.*;

public class Test {
    public static void main(String[] args) {
        long retryDate = System.currentTimeMillis();

        int sec = 600;

        Timestamp original = new Timestamp(retryDate);
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(original.getTime());
        cal.add(Calendar.SECOND, sec);
        Timestamp later = new Timestamp(cal.getTime().getTime());

        System.out.println(original);
        System.out.println(later);
    }
}

输出：

2011-11-07 10:27:45.302
2011-11-07 10:37:45.302

注意10分钟的差异，即600秒。

当然你会以这种方式失去亚毫秒级的精度，这可能并不理想 - 而且它与我通常首先使用的时间戳相反 - 但它添加秒......

另一种选择是直接使用Timestamp：

Timestamp original = ...;
Timestamp later = new Timestamp(original.getTime() + (sec * 1000L));
later.setNanos(original.getNanos());

Answer 2

我总是喜欢简洁：

int sec = 600;

Timestamp later = new Timestamp(retry_date.getTime() + sec * 1000);

或者如果你想要“现在”相对：

Timestamp later = new Timestamp(System.currentTimeMillis() + sec * 1000);

Answer 3

public void addTimeBySecondsDemo(Date date,int sec){
    //int sec = 300;
    System.out.println("Given date:"+date);
    Calendar calender = Calendar.getInstance();
    calender.setTimeInMillis(date.getTime());
    calender.add(Calendar.SECOND, sec);
    Date changeDate=calender.getTime();
    System.out.println("changeDate ..:"+changeDate);                
}

Answer 4

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            h=list[n][n+1]

Answer 5

在 java 8 中，您可以利用新的java.time.Instant。在java.sql.TimeStamp中，从 java 1.8 ：public static Timestamp from(Instant instant)和public Instant toInstant()添加了两个新方法。

所以要添加秒，我们可以将TimeStamp转换为Instant，然后调用plusSeconds然后再返回TimeStamp：

Timestamp ts_from_ws = new Timestamp(retry_date);
Instant next600Sec = ts_from_ws.toInstant().plusSeconds(600);
Timestamp ts_new_date_ws = TimeStamp.from(next600Sec);

或者一行：

Timestamp ts_new_date_ws = TimeStamp.from(new Timestamp(retry_date).toInstant().plusSeconds(600))

Java：如何在Timestamp中添加秒数？

5 个答案: