How to extract time stamp from GUID V4/comb in C#

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few samples of GUID
3eee0e14-75cf-41af-afa3-f3a89e293c4c
9f463ddb-5a5e-4e90-b947-e26e0becb78a

What I have tried:

i can't find code to start this decoding only one link
[^]

Posted 9-Nov-17 5:34am

Jawad Ahmed Tanoli

Updated 9-Nov-17 5:53am

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Dave Kreskowiak · Answer 1 · 2017-11-09T05:53:00

It's not that simple.

Not every GUID (or UUID) has a timestamp component in it. There are 5 versions of UUID's that I know of, only 2 of which use the time they are generated.

GUID's generated by Windows have been version 4 (Randomly Generated) for the last 20-ish years. There is no time component in them.

The two samples you posted are version 4 GUIDs. The first digit in the 3rd group is a 4, signaling this is a version 4 GUID. You'll also find that the first digit in the 4th group of a version 4 GUID is always going to be 8, 9, A, or B. This is because two of the bits in that digit are reserved for version information.

In a version 4 GUID, 6 bits are reserved for version data, the rest are randomly generated.

OriginalGriff · Answer 2 · 2017-11-09T05:43:00

Solution 1

You can't: What is a GUID[^] - Version 4 GUIDs are random with the exception of the four bit Version, and two bit variant fields, they do not contain a timestamp.

Posted 9-Nov-17 5:43am

OriginalGriff

Comments

Jawad Ahmed Tanoli 9-Nov-17 11:45am

have you try this link
http://www.mahonri.info/cgi/uuid.cgi

OriginalGriff 9-Nov-17 11:56am

Have you? It specifically and correctly recognises V4 GUIDs and doesn't even try to extract timestamp info ... because it knows there isn't any.