Date comparison - How to check if 20 minutes have passed?

Question

How to check if 20 minutes have passed from current date?

For example:

var start = DateTime.Now;
var oldDate = \"08/10/2011 23:50:31\"; 

    if(start ?         


        

Answer 1

var end = DateTime.Parse(oldDate);   
 if (start.Hour == end.Hour && start.AddMinutes(20).Minute >= end.Minute)