I have the following entity which has 2 datetimefields..

我有以下实体，它有2个日期时间字段。。

public class Contactos
    {

        public int IdContacto { get; set; }


        public string PrimerNombre {
            get;set; 
        }

        //Code cut for brevity

        public DateTime? FechaConsulta { get; set; }

        public DateTime? FechaArchivado { get; set; }



    }

then on my api I have this

然后在我的api上我有这个

  [ResponseType(typeof(Contactos))]
        public List<Contactos> GetContactosDepurar(DateTime fechaInicial)
        {
            var contactos = ContactosDao.GetContactosDepurados(fechaInicial);
            return contactos.ToList();
        }

and this

这个

  public static List<Contactos> GetContactosDepurados(DateTime fechaInicial)
        {
            var fecha = fechaInicial.ToString("yyyy/MM/dd");
            string sql = @"SP_ConsultarContactosDepurar";
            return Db.Read(sql, ContactosDepurar, new object[]
            {
                "@fechaInicial", fechaInicial
            }).ToList();

        }

        static readonly Func<IDataReader, Contactos> ContactosDepurar = reader =>
        new Contactos
        {
            IdContacto = reader["idContacto"].AsInt(),
            PrimerNombre = reader["primerNombre"].ToString(),
            FechaArchivado = reader["fechaArchivado"] is DBNull ?  (DateTime?)null : DateTime.ParseExact(reader["fechaArchivado"].ToString(), "dd/mm/yyyy", CultureInfo.CurrentCulture),
            FechaConsulta = reader["fechaConsulta"] is DBNull ? (DateTime?)null: DateTime.ParseExact(reader["fechaConsulta"].ToString(), "dd/mm/yyyy", CultureInfo.CurrentCulture)
        };

The problem is that when checking the RETURN values on POSTMAN, the date field is being returned as a number:

问题是，在POSTMAN上检查RETURN值时，日期字段将以数字形式返回：

   "FechaConsulta": "/Date(1459832400000-0500)/",

Just need to convert the time to your local time using the built in Time Functions. Take your pick from here:

只需要使用内置的时间函数将时间转换为您的本地时间。从这里挑选：

https://msdn.microsoft.com/en-us/library/windows/desktop/ms725473(v=vs.85).aspx

https://msdn.microsoft.com/en-us/library/windows/desktop/ms725473（v=vs.85）.aspx

I would pass a Unix/Epoch time stamp for the date. I work with Stripe quite a bit and this is how they pass all their datetimes. I adapted my answer from this post.

我会传递一个Unix/Epoch时间戳作为日期。我经常和Stripe合作，这就是他们打发所有约会时间的方式。我根据这篇文章改写了我的答案。

        var myDate = new DateTime(2017, 5, 5);
        int unixTimestamp = (int)(myDate.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;

A quick synapses is to realize that a DateTime is just a number sequence and that is how it is handled internally. When you want to see the value of DateTime you will most likely want to format that into a textual representation of the date.

一个快速的突触是意识到DateTime只是一个数字序列，这就是它在内部的处理方式。当您想查看DateTime的值时，您很可能希望将其格式化为日期的文本表示。

So instead of returning FechaConsulta and FechaArchivado, you should be returning
FechaConsulta.ToString("yyyy/MM/dd") and FechaArchivado.ToString("yyyy/MM/dd")

因此，您不应该返回FechaConsulta和FechaArchivado，而应该返回FechasConsulta.ToString（“yyyy/MM/dd”）和FechasArchivado.ToString（“yyyy/MM/d”）

For a relative quick reading on what DateTime is and how to work with it, please read the answer I posted on a question about how SQL Server stores a DateTime, how the Application works with it, and how to change display formats
Sql saving date with incorrect format

为了相对快速地了解什么是DateTime以及如何使用它，请阅读我发布的关于SQL Server如何存储DateTime、应用程序如何使用它以及如何更改显示格式的问题的答案SQL保存日期格式不正确

[Route("api/[controller]")]
    [ApiController]
    public class DateTimeController : ControllerBase
    {
        [HttpGet]
        public IActionResult GetDateTime()
        {
            DateTime CurrentdateTime = DateTime.Now;
            return Ok(CurrentdateTime);
        }
    }