Brian Proposed as answer by Brian Komar [MVP] Tuesday, October 18, 2016 5:12 AM Format a X.509 certificate. Serial Number: 41:d7:4b:97:ae:4f:3e:d2:5b:85:06:99:51:a7:b0:62 The certificates I create using openssl command line always look like the first one. openssl x509 -noout -serial -in cert.pem will output the serial number of the certificate, but in the format serial=0123456709AB. Not Before: Date before which the certificate is not valid. Serial Number: Serial number of the certificate. Dates are stored as serial numbers in Excel and they can be switched from one format to another. on different certs, on some I get a serial number which looks like this. Enter Mozilla Certificate Viewer Mozilla Certificate Viewer. Issuer Name: Name of the issuer of the certificate. When doing a ocsp test using openssl it sends the serial number as a hex string which cfssl can't find in the database when using ocspserve. You will still need to separate the Private Key (.PVK) and certificate (.DER) files, but serial number format is now irrelevant. Serial Number: 256 (0x100) On others, I get one which looks like this. Select the date cells, and right click to display context menu, select Format Cells. Option #3: OpenSSL. The result of usage "certificate.getSerialNumber()" differs from the expected. It generates certificate signing request (CSR) and private key Save both files in a safe place Note: The thumbprint of a certificate in Mozilla is considered the SHA1 Fingerprint. It is therefore piped to cut -d'=' -f2 which splits the output on the equal sign and outputs the second part - 0123456709AB . certificate serial number hex to decimal converter. As I see X509 certificate file specs, it should go in following format: 2. In cryptography, X.509 is a standard defining the format of public key certificates. Inside here you will find the data that you need. Convert date to serial number with Format Cells. To convert date to serial number, you can change the cell format to general. With this tool we can get certificates formated in different ways, which will be ready to be used in the OneLogin SAML Toolkits. If the dates in the file display as serial numbers, you can format them into any date formats; or you can use the Text Function to convert them to the date format.. This is just a representation choice for presentation purposes. Algorithm Identifier: Signature algorithm used by the certificate signer. 1. I need to get serial number of x509 certificate. When a certificate is created by cfssl it stores the serial number as a Decimal entry while the serial number is stored as hex in the cert it self. Text Function│Data Formatting. Sometimes we copy and paste the X.509 certificates from documents and files, and the format is lost. Click OK. In the Format Cells dialog, under Number tab, select General from the Category list. 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