I suspect that time is stored in some ticks but is showed in seconds. Please see the update of original post. I am almost shure that those 8 bytes are time.
Thinking 8 bytes and ticks you might want to try the following:
First four bytes (0-3) | Last four bytes (4-7)
---------------------------------------------------
seconds since epoch, | additional micro-
e.g. 00:00 1st Jan 1970 | seconds
Both four byte values are 32 bit integers.