Certificate Creation and Expiration Date
When you create a certificate, you normally create a certificate "request" that is sent to a CA to generate the certificate. The CA can override the expiration date you requested. If you use OpenSSL to generate the certificate request, you use the "-days" parameter to specify expire days. To generate a self-signed certificate, use the OpenSSL command with the "-x509" parameter.
Date Formats in Certificates
The date of birth format should be dd/mm/yyyy. In American English, the month comes before the day, then the year.
Certificate Types and Related Information
- A medical certificate confirms an illness. It is issued after a disease to be presented at work or school and includes the patient’s and doctor’s name, address, and date.
- A share certificate states the issue date and details on the shares taken by a shareholder, serving as a receipt of the stock purchase, noting details like the number of shares.
- A notarial certificate confirms facts of a notarization, including the venue, act type, signer name, date, and notary statement.
- Authorization certificates require checklists with full date, name and details of the bearer, and the purpose of writing.
Certificate Changes and Overrides
You can change the type of economic activity by submitting a certificate to the institution confirming this change. Protocols for making changes to a birth certificate differ across states. About 14,000 birth certificates circulate in the US. Root SSL certificates have longer expiration dates, like 20-25 years, because they are in every client connecting to the Internet. Intermediate CAs cannot issue certificates longer than their own, but you can override default certificate expiration dates in some cases.
Tools and Resources for Certificates
To check a TLS/SSL certificate’s expiration date, use the "dates" command or an online SSL Certificate Decoder tool. These show details like the issuer, who it’s issued to, expiry dates, fingerprints, and more. You can create certificates in Canva by searching for templates, customizing them by adding text and images, then downloading or saving.
Date Writing Guidelines
In formal usage, it is not appropriate to omit the year or to use a purely numerical form of the date. Always write the date in full when it is part of a sentence, giving the day, month, and year. The date format is dd/mm/yyyy, representing day/month/year.
Writing the Date on a Diploma
The date format dd/mm/yyyy stands for day/month/year where the first two digits represent the day of the month, the next two digits represent the month, and the last four digits represent the year.