Richard Kao wrote:
Hi,
Hope someone can help me understand the validity date and time format of
x509.
For example, when connecting to https://401k.fidelity.com/, my IE shows
it's cert validity is
Valid from: August 30, 2006 5:00:00 PM
Valid to: August 31, 2007 4:59:59 PM
The above is your local time zone, the numbers are in "zulu" thus the Z or GMT.
So you are in EDT?
Ethereal shows the same fields of the x509 cert as:
decoded notBefore: 0 6 0 8 3 1 0 0 0 0 0 0 Z
(hex: 30 36 30 38 33 31 30 30 30 30 30 30 5A)
decoded notAfter: 0 7 0 8 3 1 2 3 5 9 5 9 Z
(hex: 30 37 30 38 33 31 32 33 35 39 35 39 5A)
It's staightfoward that 0 6 0 8 3 match 2006 08 3*, 0 7 0 8 3 match 2007
08 3*; 0 0 0 0 Z match 00:00, 5 9 5 9 Z match 59:59, but I found it's a
bit confusing to decode the middle digits of notBefore and notAfter.
Any hints?
Rick
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Argonne National Laboratory
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