>>From the GCHG competition :
>>
>>Q. Sometimes security vulnerabilities are simple coding mistakes that even the most seasoned developers can make. What is wrong with the following lines of (C#) code to compute a date range to filter a list of results? What would be a better approach?

var currentDate = DateTime.Now;
>>var startDate = new DateTime(currentDate.Year - 1, currentDate.Month, currentDate.Day);
>>var endDate = currentDate;
>>// Filter the results etc.

>
>There is a possibility of today's date being Feb 29. In this case the code will generate an error.
>
>(I haven't checked other answers yet).

Half marks - you identified the problem but didn't provide a solution :-}