C# attribute to check whether one date is earlier than the other

Question

I have a ViewModel for my MVC4 Prject containing two DateTime properties:

[Required]
[DataType(DataType.Date)]
public DateTime RentDate { get; set; }

[Required]         


        

Answer 1

If you're using .Net Framework 3.0 or higher you could do it as a class extension...

    /// 

    /// Determines if a DateTime falls before another DateTime (inclusive)
    /// 
    /// The DateTime being tested
    /// The DateTime used for the comparison
    /// bool
    public static bool isBefore(this DateTime dt, DateTime compare)
    {
        return dt.Ticks <= compare.Ticks;
    }

    /// 

    /// Determines if a DateTime falls after another DateTime (inclusive)
    /// 
    /// The DateTime being tested
    /// The DateTime used for the comparison
    /// bool
    public static bool isAfter(this DateTime dt, DateTime compare)
    {
        return dt.Ticks >= compare.Ticks;
    }