带有PHPs date()函数的16位时间戳

Question

如何使用PHP的date()函数使用以下16位数时间戳(来自XML文件)？

1295076698126000  // 15-01-2011 08:31:38.126
1286697695521000  // 10-10-2010 10:01:35.521

Answer 1

那些时间戳以微秒为单位.但是,由于PHP在几秒钟内使用整数作为时间戳date(),因此您将无法获得微秒值.您仍然可以通过将时间戳除以百万(100万微秒= 1秒)打印剩余的日期,并将商传递给date():

// "u" will always be printed as 000000 regardless of actual microseconds
echo date('d-m-Y H:i:s.u', 1295076698126000 / 1000000);

编辑: Hacky,但你可以执行手动算法来获得毫秒并单独输出它作为一种解决方法,如下所示:

$xml_timestamp = 1295076698126000;
$seconds = $xml_timestamp / 1000000;
$microseconds = $seconds - floor($seconds);
$seconds = floor($seconds);

// 1 millisecond = 1000 microseconds
// Milliseconds, because your desired output is 3 decimal places long, not 6
$milliseconds = round($microseconds * 1000);

$format = 'd-m-Y H:i:s.' . sprintf('%03d', $milliseconds);
echo date($format, $seconds);

对于可重用性,该DateTime课程是一个不错的选择.或者,自定义功能:

function date_milliseconds($format, $timestamp = NULL) {
    $seconds = ($timestamp === NULL) ? microtime(true) : $timestamp / 1000000;
    $microseconds = $seconds - floor($seconds);
    $seconds = floor($seconds);
    $milliseconds = round($microseconds * 1000);

    $format = preg_replace('/(?<!\\\\)u/', sprintf('%03d', $milliseconds), $format);
    return date($format, $seconds);
}

echo date_milliseconds('d-m-T H:i:s.u', floatval($xml_timestamp));