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copied!<p>Based on what I've seen while using JSON.NET for a while now, you will never, with the default settings, parse a string and retrieve a token with type <code>JTokenType.TimeSpan</code> (same for some other types as well, such as Guid or Uri). I have a pretty good guess of why this is the case (based on my experience working a few years ago with the <code>DataContractJsonSerializer</code>).</p> <p>Basically, it's a matter of how much information the parser can retrieve out of the input. JSON is a very simple syntax which only knows about <em>numbers</em>, <em>boolean</em> and <em>strings</em> (in addition to arrays and objects). Many CLR types don't have a native JSON type (Uri, DateTime, DateTimeOffset, TimeSpan, and so on), so when any JSON parser is reading the data, it will try to use the best match.</p> <p>If you're deserializing the JSON string into a CLR data type, then the serializer has some additional information that it can use to disambiguate what a JSON string maps to - the type of the field / property that value is being deserialized to. However, when you're deserializing a JSON data to a <code>JToken</code> object graph, there's no additional information, and JSON.NET has to choose one type. The most natural type to deserialize a JSON string is, well, a CLR string.</p> <p>But why do dates are deserialized correctly as <code>JTokenType.Date</code>? IIRC, the JSON.NET reader has a special code for dates (controlled by the <code>DateParseHandling</code> enumeration), which tries to match the parsed strings to some predefined formats (either ISO 8601 or the old Microsoft ASP.NET AJAX format), and if it finds a string which match it, it will read it as a <code>DateTime</code> (or <code>DateTimeOffset</code>) instead of a string. I don't know whether it's possible to extend that behavior to also support <code>TimeSpan</code> or other types, but I wouldn't be surprised, since the extensibility in JSON.NET is quite good.</p>

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