Text Function│Data Formatting. Brian Proposed as answer by Brian Komar [MVP] Tuesday, October 18, 2016 5:12 AM Format a X.509 certificate. To convert date to serial number, you can change the cell format to general. In cryptography, X.509 is a standard defining the format of public key certificates. 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.. Serial Number: Serial number of the certificate. certificate serial number hex to decimal converter. As I see X509 certificate file specs, it should go in following format: Option #3: OpenSSL. 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. It is therefore piped to cut -d'=' -f2 which splits the output on the equal sign and outputs the second part - 0123456709AB . Not Before: Date before which the certificate is not valid. SSL Certificate Decoder What it does? Select the date cells, and right click to display context menu, select Format Cells. Sometimes we copy and paste the X.509 certificates from documents and files, and the format is lost. Convert date to serial number with Format Cells. This is just a representation choice for presentation purposes. Click OK. 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. Issuer Name: Name of the issuer of the certificate. Inside here you will find the data that you need. 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. In the Format Cells dialog, under Number tab, select General from the Category list. The result of usage "certificate.getSerialNumber()" differs from the expected. You will still need to separate the Private Key (.PVK) and certificate (.DER) files, but serial number format is now irrelevant. With this tool we can get certificates formated in different ways, which will be ready to be used in the OneLogin SAML Toolkits. Not After: Date after which the certificate is not valid. For a integer ( in decimal or hex, or anyother base ), DER encoding have a negative serial number, we treat it as positive integer and convert it to The bn strng is written in xml signature as certificate serial number. Note: The thumbprint of a certificate in Mozilla is considered the SHA1 Fingerprint. on different certs, on some I get a serial number which looks like this. openssl x509 -noout -serial -in cert.pem will output the serial number of the certificate, but in the format serial=0123456709AB. Serial Number: 256 (0x100) On others, I get one which looks like this. Enter Mozilla Certificate Viewer Mozilla Certificate Viewer. 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