Php检查当前时间

我在检查提交时间的当前时间方面遇到一些问题

im having a little problem about checking the current time on submitted time

date_default_timezone_set('Asia/Hong_Kong');
$date = date('Y-m-d H:i:s');

但我不知道如何计算$ late



我的尝试：

but i dont know how to compute the $late

What I have tried:

<pre>if(isset($_POST['submit']) {


if (date (H)< 1pm) {

/* get the time difference or */ echo " you're late $late ";

// do something  }

else if (date (H) < 4pm) {

/get the time difference or */ echo " you're late $late ";

// do something }

else if (date (H) < 7pm {

/* get the time difference or */echo " you're late $late ";

// do something }

}

< /