DateTime problem

Hi all, in my model I have a LastModified variable:

public DateTime? LastModified { get; set; }

In my service, each time I get a Put request, I update the variable in this way:

request.LastModified = System.DateTime.UtcNow;

The problem starts when I get back the DTO (from my Get service)… I get LastModified formatted in this way:

"LastModified": "/Date(1451186188773)/",

Is there a way to better format it? Removing /Date()/ and keeping only the internal value maybe?
Thank you!

See this answer on how to customize JSON DateTime Format, i.e. you can customize it with JsConfig.DateHandler.