Set date datatypes in model.

Cicm.Database/Models/Processor.cs

@@ -53,6 +53,7 @@ namespace Cicm.Database.Models
         [StringLength(45)]
         public string ModelCode { get; set; }
         [DisplayFormat(DataFormatString = "{0:d}")]
+        [DataType(DataType.Date)]
         public DateTime? Introduced { get; set; }
         [DisplayName("Instruction set")]
         public int? InstructionSetId { get; set; }