create a JSON DateTime string with .NET

Question

For a strange reason that does not matter for this question I need to create a JSON compatible substring that represents a DateTime and that will be manually insterted into a larger JSON string that later will be parsed by .NET's DataContractJsonSerializer. I have come up with the following method:

static readonly DataContractJsonSerializer s = new DataContractJsonSerializer(typeof(DateTime));
private static string ToJsonString(DateTime time)
{
 using (var memStream = new MemoryStream())
 {
  s.WriteObject(memStream, time);
  return Encoding.UTF8.GetString(memStream.ToArray());
 }
}

Is there any simpler way to do this or can the code above be optimized in any way? Or is there even a mistake in the code above?

Also it would be really cool if I could do it without the use of DataContractJsonSerializer since the string building will also be done in a pure .NET 1.1 process.

enderminh · Accepted Answer · 2009-12-04 20:21:26Z

1

Could you use the milliseconds-from-epoch time approach? Like this extension method?

 public static class DateTimeExtensions
    {
        private static readonly DateTime Epoch = new DateTime(1970, 1, 1);

        public static string ToJson(this DateTime time)
        {
            return string.Format("\\/{0:0}\\/", (time - Epoch).TotalMilliseconds);
        }
    }

answered Dec 4, 2009 at 20:21

enderminh

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2 Comments

bitbonk Over a year ago

Is this really safe? How about UTC vs., localtime, I noticed DataContractJsonSerializer creates different strings for them. Whoknowswherelse it would create adifferent looking string....

enderminh Over a year ago

I suppose you can convert both DateTime to UTC first before you do the calculations. Just do DateTime.ToUniversalTime() before you do the substraction.

Chris Smith · Accepted Answer · 2009-12-04 22:25:01Z

1

I would use NewtonSoft JSON and delegate the responsibility of serializing the DateTime to that. It supports serializing DateTime to ISO 8601 format (2008-04-12T12:53Z etc) and is far more reliable than DataContractJsonSerializer.

You can use it to serialize native objects or use it as a text writer to manually generate JSON. It's easier to use this than writing strings out believe me.

http://www.codeplex.com/Json

Alternatively, you could wrap that inside your ToString logic.

answered Dec 4, 2009 at 22:25

Chris Smith

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