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My java application uses a keystore file in which I have a certificate which is used in ssl connection with active directory server. What I have to do is to check its expiration date and prompt user if its close to expire. I have to do it while my application starts. My idea is to use external program: keytool to display info about certain certificate in the keystore and then do some parsing operations on a string which keytool outputs to find this validation date. Here's the output of a specific keytool command: Owner: Issuer: CN=CPD Root CA, DC=cpd, DC=local Serial number: 39e8d1610002000000cb Valid from: Wed Feb 22 21:36:31 CET 2012 until: Thu Feb 21 21:36:31 CET 2013 Certificate fingerprints: MD5: 82:46:8B:DB:BC:5C:64:21:84:BB:68:E3:4B:D4:35:70 SHA1: 35:52:CA:F2:11:66:1E:50:63:BC:53:A5:50:C1:F0:1E:62:81:BC:3F Signature algorithm name: SHA1withRSA Problem would be with parsing date since I can't be sure in which format it is displayed. Is there any easier way to check expiration date of certificates included in java keystore file?

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