C program for validating date
In the walkthrough, you will create a page for a Web site that allows visitors to request a reservation.
Because the purpose of the walkthrough is to illustrate validation, the nature of the reservation is not important (for example, if could be for a restaurant, a community center meeting room, or something else), and the page does not actually process the reservation.
If you have already created a Web site in Visual Studio (for example, by working with the topic ), you can use that Web site and skip to "Adding Controls" later in this walkthrough. In effect, you write client script that duplicates the logic that your server-side validation performs.
Writing client-side custom validation code is not always practical (for example, if the custom code validates a user's entry by looking in a server-side database).
If both the server and root certificates are found and loaded, the following output is produced for a successful validation: ./certverify Verification return code: 0 Verification result text: unable to get local issuer certificate Verification failed cert: country Name = JP state Or Province Name = Tokyo common Name = nagios.frank4The typical error message for a failed verification, " unable to get local issuer certificate", is very vague about the real problem.
Consider having a longer chain of certificates, which one is broken? In the code above, this message is also returned if the CA file does not exist.
However, it’s a bit hard to validate the leap year , 30 or 31 days of a month, we may need basic logic as below.
Finally, you will learn how you can validate user input conditionally, depending on choices that the user makes in a page.
The verification mode can be additionally controlled through 15 flags.
Some add debugging options, but most notably are the flags for adding checks of external certificate revocation lists (CRL).
[1-9] # 01-09 or 1-9 | # .[0-9] # 10-19 or 20-29 | # .3 # 30, 31 ) #end of group #1 / # follow by a "/" ( # start of group #2 0?
[1-9] # 01-09 or 1-9 | # .1 # 10,11,12 ) # end of group #2 / # follow by a "/" ( # start of group #3 (19|20)\d\d # 19[0-9][0-9] or 20[0-9][0-9] ) # end of group #3 The above regular expression is used to validate the date format in “dd/mm/yyyy”, you can easy customize to suit your need.