Determine whether the date expires

In the user permission system, it is sometimes necessary to determine whether to expire based on the user's contract time and contract duration. First help class:

    public static class DateExprieHelper
    {
        /// <summary>
/// Determine whether to expire Based on the Contract Signing time and contract duration
        /// </summary>
/// <Param name = "joindate"> contract time </param>
/// <Param name = "duration"> contract duration </param>
        /// <returns></returns>
        public static bool IsExpriredByDay(DateTime joinDate, double duration)
        {
                return DateTime.Now - joinDate > TimeSpan.FromDays(duration);          
        }
    }

 

Client call.

    class Program
    {
        static void Main(string[] args)
        {
            var result = DateExprieHelper.IsExpriredByDay(new DateTime(2014, 1, 1), 365);
            if (result)
            {
Console. writeline ("expired ~~ ");
            }
            else
            {
Console. writeline ("not expired yet ~~ ");
            }
            Console.ReadKey();
        }
    }

The result shows that the instance has not expired ~~

Determine whether the date expires