Convert Active Directory TimeStamps to and from Unix Timestamps

ad_unix_conversion_test.php

// based on http://stackoverflow.com/questions/15770879/unix-timestamp-to-ldap-timestamp
<?php
date_default_timezone_set('America/New_York');

// Microsoft TIMESTAMP epoch is Jan 1, 1601 http://www.selfadsi.org/deep-inside/microsoft-integer8-attributes.htm
// More Info:
// http://blogs.technet.com/b/askds/archive/2009/04/15/the-lastlogontimestamp-attribute-what-it-was-designed-for-and-how-it-works.aspx
function ldapTimeToUnixTime($ldapTime) {
  $secsAfterADEpoch = $ldapTime / 10000000;
  $ADToUnixConverter = ((1970 - 1601) * 365 - 3 + round((1970 - 1601) / 4)) * 86400;
  return intval($secsAfterADEpoch - $ADToUnixConverter);
}

function unixTimeToLdapTime($unixTime) {
  $ADToUnixConverter = ((1970 - 1601) * 365 - 3 + round((1970 - 1601) / 4)) * 86400;
  $secsAfterADEpoch = intval($ADToUnixConverter + $unixTime);
  return $secsAfterADEpoch * 10000000;
}
 
$current_unix_ts = time();
print "Current time from unix time: " . date("Y-m-d\TH:i:s\Z", $current_unix_ts) . "\n";
$afteradconv = unixTimeToLdapTime($current_unix_ts);
print "After AD Conversion: " . $afteradconv . "\n";
$ldapconv = ldapTimeToUnixTime($afteradconv);
print "After AD to Unix conversion: " . date("Y-m-d\TH:i:s\Z", $ldapconv) . "\n";

awesome! thanks!