18 digit timestamp?

Question

I am working on a system related to tv recordings.

I am parsing the following xml from another system (to which i have no documentation):

Answer 1

It looks like C#'s DateTime ticks:

The DateTime value type represents dates and times with values ranging from 12:00:00 midnight, January 1, 0001 Anno Domini (Common Era) through 11:59:59 P.M., December 31, 9999 A.D. (C.E.)

This line:

Console.WriteLine (new DateTime (633936042047633656));

prints:

11/12/2009 6:30:04 AM

If you need to convert from those numbers to Unix time, substract 621355968000000000L, which is the Unix epoch expressed in ticks.

Answer 2

With the gmp lib installed in php you can do it like this:

$epoch     = '621355968000000000';
$newtime   = gmp_sub($dateTime, $epoch);
$newtime   = gmp_div($newtime, '10000000');
$timestamp = gmp_strval($newtime);

and now you got a date:

echo date('Y-m-d H:i:s', $timestamp);

Answer 3

$dateLargeInt= "131424999530821857";
$secsAfterADEpoch = $dateLargeInt / (10000000); 
$ADToUnixConvertor=((1970-1601) * 365.242190) * 86400;
// unix epoch - AD epoch * number of tropical days * seconds in a day 
$unixTsLastLogon=intval($secsAfterADEpoch-$ADToUnixConvertor); 

// unix Timestamp version of AD timestamp
$lastlogon=date("d-m-Y", $unixTsLastLogon); // formatted date

echo $lastlogon;