PHP转换WIM日期格式

Question

I am writing a wrapper library for WIM files (long story), but I have been having difficulty with the dates encoded in it. The format is:

[creationtime] => Array
                        (
                            [highpart] => 0x01CA0446
                            [lowpart] => 0x8E44DCAF
                        )

This format is inside the WIM file XML. I have tried every date decoding technique I can think of! Any ideas would be much appreciated. The only things I have to go on are things related to Long Integers and WIN32 DateTime... But no luck so far.

Answer 1

liCreationTime is defined as LARGE_INTEGER in the WIM spec (I downloaded from MS)

This looked to me like it would be similar (if not the same) as a timestamp returned by QueryPerformanceCounter - which thankfully makes things very simple!

I did this using a calculator and command line PHP, you'll have to implement the code yourself.

Take your high and low parts and turn them into a single 64bit value.

0x01CA04468E44DCAF -> 128920240414579887

Divide that by 100000000

1289202404

Use it as the input to date()

php -r "var_dump(date('Y-m-d H:i:s', 1289202404));"
string(19) "2010-11-08 07:46:44"

Edit:

Or maybe I just got lucky.

If it is the number of nanoseconds since 1601, as other answers seem to indicate, you can use a slightly different calculation.

php -r "var_dump(date('Y-m-d H:i:s', (128920240414579887/100000000)-41651963));"
string(19) "2009-07-14 05:47:21"