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
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().First();
jsonFormatter.SerializerSettings.DateTimeZoneHandling = DateTimeZoneHandling.Local;
app.UseWebApi(config);
}