我有一个WordPress博客，在那里我只需要在每篇文章上显示一个图像，持续3周。这意味着3周后，自每篇帖子发布以来，图像将消失。

首先，我确保每次发布新帖子时都会显示该图像。这很容易。然后我需要得到每篇文章发表的日期，我使用the_time(); 作用

我现在的问题是我不知道如何使用the_time(); 函数可以执行任何操作（与当前时间比较，添加3周等）。

我试着用javascript实现这一点，使用这段代码，它可以输出当前日期和3周后的日期。

now = new Date();
threeweeksfromnow = new Date(now.getTime() + (21 * 24 * 60 * 60 * 1000));
months = new Array("January ","February ","March ","April ","May ","June ","July ","August ","September ","October ","November ","December ");

document.write("Today\'s date is: " + months[now.getMonth()] + now.getDate() + "<br>");

document.write("Three weeks from today is: " + months[threeweeksfromnow.getMonth()] + threeweeksfromnow.getDate() + "<br>"); 

我试图将此代码与the_time(); wordpress中的函数，但它不起作用。有人知道我如何解决这个问题吗？

if ( strtotime( get_the_time(\'Y-m-d H:i:s\') ) + 21*24*60*60 > time() ) {  // if post_time + 3 weeks is greater than current time
  // show your image ( the_post_thumbnail() or antyhing else you want to do)
}