Your program can be invoked with option: -d date, where date is entered in dd/mm/yyyy format. In this case, it must only print the following string:

Found cookies expiring before or on

To find the cookies expiring before, or on, the date given in the option, your program must convert this date to the Unix epoch format and compare it with the dates stored in cookies_file. The time of the date is always assumed to be 0 hours, 0 minutes, 0 seconds and the time used is the Coordinated Universal Time (UTC), also often referred to as Greenwich Mean Time (GMT). Perl has a function for converting a GMT time to the Unix epoch time.

Example with the example cookies_file given above:

Command line:

cookiemgr.pl cookies_file -d 31/12/2012

The Unix epoch format for 31/12/2012, midnight, is 1356912000. In file cookies_file there are three dates which are smaller or equal than 1356912000. Therefore, the output must be:

Found 3 cookies expiring before or on 31/12/2012 Option -d date can only be used once per command line (you can only ask for the cookies for a given date at a time).

In the case in which file  cookies_file contains no cookies expiring before or on the given date, your program must instead only print:

No cookies found expiring before or on

Example with the example cookies_file given above:

Command line:

cookiemgr.pl cookies_file -d 31/05/2010

The Unix epoch format for 31/05/2010, midnight, is 1275264000. In file cookies_file there are no dates which are smaller or equal than 1275264000. Therefore, the output must be: No cookies found expiring before or on 31/05/2010