Convert 8 bytes timestam to readable Date and Time

I'm not sure where to post this, but here goes:


I'm trying to understand how a binary file (.olk Outlook office 2016 for MAC) works.
I'm using a hex editor do this. I understand most of the file, however I am stuck with this timestamp problem. I am 100% sure that a part of this hex is the actual timestamp:

'00 00 00 5F BF 35 BE 41'

On screen, it outputs: 23 Jan 2017 10:04:39

'00 00 00 5F BF 35 BE 41' value is 4737282954089201664 according to little endian

'00 00 00 5F BF 35 BE 41' value is 411229863489 according to big endian


If i edit(modify) hex value 00 00 00 5F BF 35 BE 41 than i get Date and time which is 1 Jan 2001 05:30:00 .
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