keep C# datetime local time between json and Web api?

Question

I have problem when I have datatime in json object it will convert it to UTC time zone in C# dateTime just want to ask how to keep local time?can I set time zone property in w

Answer 1

You can use TimeZoneInfo.ConvertTime to convert to the wanted timezone.

Checkout this method: https://msdn.microsoft.com/en-us/library/bb382770(v=vs.110).aspx

Answer 2

You can change your serializer settings to use the JSON.net serializer :

GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings = 
    new JsonSerializerSettings
    {
        DateFormatHandling = DateFormatHandling.IsoDateFormat,
        DateTimeZoneHandling = DateTimeZoneHandling.Unspecified,
    };

There is also various date format you can choose from : DateTimeZoneHandling

/// <summary>
/// Specifies how to treat the time value when converting between string and <see cref="DateTime"/>.
/// </summary>
public enum DateTimeZoneHandling
{
    /// <summary>
    /// Treat as local time. If the <see cref="DateTime"/> object represents a Coordinated Universal Time (UTC), it is converted to the local time.
    /// </summary>
    Local = 0,

    /// <summary>
    /// Treat as a UTC. If the <see cref="DateTime"/> object represents a local time, it is converted to a UTC.
    /// </summary>
    Utc = 1,

    /// <summary>
    /// Treat as a local time if a <see cref="DateTime"/> is being converted to a string.
    /// If a string is being converted to <see cref="DateTime"/>, convert to a local time if a time zone is specified.
    /// </summary>
    Unspecified = 2,

    /// <summary>
    /// Time zone information should be preserved when converting.
    /// </summary>
    RoundtripKind = 3
}

Answer 3

You can configure this. See: http://www.newtonsoft.com/json/help/html/SerializeDateTimeZoneHandling.htm

Here's an example:

public void Config(IAppBuilder app)
{
    var config = new HttpConfiguration();

    var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
    jsonFormatter.SerializerSettings.DateTimeZoneHandling = DateTimeZoneHandling.Local;

    app.UseWebApi(config);
}