Предоставлено Хью Ботвеллом в ответ на этот вопрос:
Помогите мне перевести длинное значение, выраженное в шестнадцатеричном виде, обратно в дату / время
<?php
// strip non-hex characters
function hexstring($str) {
$hex = array(
'0'=>'0', '1'=>'1', '2'=>'2', '3'=>'3', '4'=>'4',
'5'=>'5', '6'=>'6', '7'=>'7', '8'=>'8', '9'=>'9',
'a'=>'a', 'b'=>'b', 'c'=>'c', 'd'=>'d', 'e'=>'e', 'f'=>'f',
'A'=>'a', 'B'=>'b', 'C'=>'c', 'D'=>'d', 'E'=>'e', 'F'=>'f'
);
$t = '';
$len = strlen($str);
for ($i=0; $i<$len; ++$i) {
$ch = $str[$i];
if (isset($hex[$ch]))
$t .= $hex[$ch];
}
return $t;
}
// swap little-endian to big-endian
function flip_endian($str) {
// make sure #digits is even
if ( strlen($str) & 1 )
$str = '0' . $str;
$t = '';
for ($i = strlen($str)-2; $i >= 0; $i-=2)
$t .= substr($str, $i, 2);
return $t;
}
// convert hex string to BC-int
function hex_to_bcint($str) {
$hex = array(
'0'=>'0', '1'=>'1', '2'=>'2', '3'=>'3', '4'=>'4',
'5'=>'5', '6'=>'6', '7'=>'7', '8'=>'8', '9'=>'9',
'a'=>'10', 'b'=>'11', 'c'=>'12', 'd'=>'13', 'e'=>'14', 'f'=>'15',
'A'=>'10', 'B'=>'11', 'C'=>'12', 'D'=>'13', 'E'=>'14', 'F'=>'15'
);
$bci = '0';
$len = strlen($str);
for ($i=0; $i<$len; ++$i) {
$bci = bcmul($bci, '16');
$ch = $str[$i];
if (isset($hex[$ch]))
$bci = bcadd($bci, $hex[$ch]);
}
return $bci;
}
// WARNING! range clipping
// Windows date time has range from 29000 BC to 29000 AD
// Unix time only has range from 1901 AD to 2038 AD
// WARNING! loss of accuracy
// Windows date time has accuracy to 0.0000001s
// Unix time only has accuracy to 1.0s
function win64_to_unix($bci) {
// Unix epoch as a Windows file date-time value
$magicnum = '116444735995904000';
$t = bcsub($bci, $magicnum); // Cast to Unix epoch
$t = bcdiv($t, '10000000', 0); // Convert from ticks to seconds
return $t;
}
// get input
$dtval = isset($_GET["dt"]) ? strval($_GET["dt"]) : "0";
$dtval = hexstring($dtval); // strip non-hex chars
// convert to quadword
$dtval = substr($dtval, 0, 16); // clip overlength string
$dtval = str_pad($dtval, 16, '0'); // pad underlength string
$quad = flip_endian($dtval);
// convert to int
$win64_datetime = hex_to_bcint($quad);
// convert to Unix timestamp value
$unix_datetime = win64_to_unix($win64_datetime);
?><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Windows datetime test code</title>
</head>
<form method="get">
<label>Datetime value: <input name="dt" type="text" value="<?php echo $dtval; ?>"/></label>
<input type="submit" />
</form>
<hr />
Result:
Quad: <?php echo $quad; ?><br />
Int: <?php echo $win64_datetime; ?><br />
Unix timestamp: <?php echo $unix_datetime; ?><br />
Date: <?php echo date("D, d F Y H:i:s e", $unix_datetime); ?><br />
<body>
</body>
</html>