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James Newton-King
2012-03-20 01:08:30 +13:00
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Doc/DatesInJSON.html
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<p>DateTimes in JSON are hard.</p>
<p>
The problem comes from the <a href="http://www.ietf.org/rfc/rfc4627.txt" target="_blank">JSON spec</a> itself, there is no literal syntax for dates in JSON. The spec has objects, arrays, strings, integers and floats, but it defines no standard for what a date looks like.</p>
<p>The default format used by <a href="http://james.newtonking.com/projects/json-net.aspx" target="_blank">Json.NET</a> for dates is the same one used by Microsoft: "\/Date(1198908717056)\/". You can read more about it <a href="http://weblogs.asp.net/bleroy/archive/2008/01/18/dates-and-json.aspx" target="_blank">here</a>.</p>
<p>The default format used by <a href="http://james.newtonking.com/projects/json-net.aspx" target="_blank">Json.NET</a>
is the ISO 8601 standard: 2012-03-19T07:22Z. You can read more about it <a href="http://en.wikipedia.org/wiki/ISO_8601" target="_blank">here</a>.</p>
<p>Prior to Json.NET 4.5 dates were written using the Microsoft format:
&quot;\/Date(1198908717056)\/&quot;. If you want to use this format, or you want to
maintain compatibility with Microsoft JSON serializers or older versions of
Json.NET then change the DateFormatHandling setting to MicrosoftDateFormat.</p>
<h3>DateTime JsonConverters</h3>
<p>With no standard for dates in JSON, the number of possible different formats when interoping with other systems is endless. Fortunately Json.NET has a solution to deal with reading and writing custom dates: JsonConverters. A JsonConverter is used to override how a type is serialized.</p>
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</div>
<p>Technically this is invalid JSON according to the spec but all browsers, and some JSON frameworks including Json.NET, support it. </p>
<h4>IsoDateTimeConverter</h4>
<p>IsoDateTimeConverter seralizes a DateTime to an <a href="http://en.wikipedia.org/wiki/ISO_8601" target="_blank">ISO 8601</a> formatted string.</p>
<p>IsoDateTimeConverter seralizes a DateTime to an <a href="http://en.wikipedia.org/wiki/ISO_8601" target="_blank">ISO 8601</a> formatted string.
Note that since Json.NET 4.5 dates are written using the ISO 8601 format by
default and using this converter is unnecessary.</p>
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