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Clients can request either JSON or XML in the Accept header of the HTTP request. From studying the code it seems this parameter should be a function, but something is calling this function and passing a number for chainFilter. For example to represent multi-national stores where all stores open at 8:00 AM.

The Serialize method writes the Data object to the JsonTextWriter created earlier. This is a silly format for a date to be in on the wire. Using Json method on ASP.

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Strings are mostly easy. They always will be. There's different calendars, different formats. Did you know it's 2004 in the Ethiopian Calendar? Yakatit 26, 2004, in fact. This clears out the existing posts. Here's the JSON on the wire. That's milliseconds since the beginning of the Unix Epoch WITH a TimeZone. AddHours -8 Sunday, March 04, 2012 12:00:00 AM Yuck. Regardless, it doesn't bind with KnockoutJS either. I could add a bindingHandler for dates like this: ko. It's lousy parsing and it doesn't even take the TimeZone into consideration. This is a silly format for a date to be in on the wire. I was talking to some folks on Twitter in the last few days and said that all this is silly and JSON dates should be ISO 8601, and we should all move on. We on the web team will be including JSON. NET as the default JSON Serializer in Web API when it releases, so that'll be nice. I mentioned this to Raffi from Twitter a few weeks back and he agreeds. Well, see for yourself: in a random public timeline tweet... Let's just do it the JavaScript 1. Here's Firefox, Chrome and IE. We're going to do this by default in ASP. NET Web API when it releases. We aren't doing this now in Beta You can see. You can also that bundles some useful methods for ASP. Today with the Beta, I just need to update my global. Add new IsoDateTimeConverter ; GlobalConfiguration. NET will be the default serializer AND Web API will use ISO 8601 on the wire as the default date format for JSON APIs. Sponsor: Big thanks to DevExpress for sponsoring this last week's feed. There is no better time to discover DevExpress. Visual Studio 11 beta is here and DevExpress tools are ready! Dates are such a common data type that it seems absurd that JSON didn't bother including this in the. These structures can be nested. Net JSON serializer, but I really like using a standard date format, especially 8601. Hopefully all the JSON libraries will recognize this format. So, you are introducing a BREAKING CHANGE with this. I know you may hate the existing datetime format I do to , but existing sites really rely on that, and this artical on MSDN. Basically, I can't just update to use this instead of the existing api for a few reasons: 1 Breaking the contract - We have told our users that the date has to be in this format 2 We have a strict restriction on using 3rd party libraries, so now you are DEFAULTING to it?? Our legal department will have a fit! Is it also switching, or do we have issues within our own app WCF expecting one format, and this giving another. PLEASE DO NOT set JSON. This is lousy: new Date parseInt jsonDate. Sometimes standards really do make things easier, this one especially. Net really kicks butt too. Also, I just finally setup a W8 box and played a little with VS11 Beta and the WebAPI. The OS experience is a little disheartening yet, but I'm digging VS and WebAPI a lot... My concern is the same. If I just upgrade, without making any code changes, it will change the format. This release was SUPPOSED to be an inline update that DID NOT have any breaking changes - THIS IS ONE. And then, what about, like us, a large corp that can't update everything at once, we have some using the old and some using the new format. This means, even if we could get by our legal department they look really hard at the license agreement that we can NEVER use the new format, as it won't work with the systems that still require the old, unless they update DataContractJsonSerializer with support for more dates. Normal WCF JSON serialization isn't changing, and Web API is still in beta. If you want to continue using DataContractJsonSerializer then why not create a MediaTypeFormatter that uses DataContractJsonSerializer? If Microsoft doesn't include one out of the box then I'm sure someone else will make one. NET is the standard MIT license. Chad - You don't use modernizr, Jquery, jqueryUI or any of the other 3rd party libs? This will be supported Open Source just like our existing uses I open source. Want to use a different default? Easy to switch back. Remember that when we include open source, we back it with support. If you call and have a problem with ASP. NET, we will support all of it, including the open source we ship. We have been doing that for 3+ years now. Also, Chad - we are changing only ASP. A product that isn't released. We aren't changing asp. There is no breaking change as this is a new product, only now in beta. Chad, I don't think you read the post correctly. This change to the default serializer is happening in the ASP. NET Web API, not. The standalone serializer isn't being removed. This change is only happening between the Web API beta and the final RTM. If your corporation is as large as you say it is, I seriously doubt you have production code deployed on a Web API beta that was only released a couple weeks ago. TLDR: Nobody moved your cheese. Everything will be okay. OK, so now only the webapi is updated, that is better, but we still won't be able to use it. I was more making a point about the library as we already use JSON. NET in some situations. The problem I see now is one of incompatibility. If you aren't updating WCF, or ASP. NET, dates creating in one won't work in the other. So how do you suggest calling an existing service when you have a DateTime as a property in the serialized object? How do you know what format to put it in? I know that JSON. NET can handle it, but it requires a special date handler, and DataContractJsonSerializer won't handle the new format. Can there at least be updates to make it EASILY work between services, without having to know what date format it is in. Parse handles several, but not the existing DataContractJsonSerailizer format, and then there is JavascriptSerializer - which is different. I really like the simplicity of the DataContractJsonSerializer, and have heard several of my coworkers complain about JSON. So glad to see this! I just recently ran into this issue with MVC3 JsonResult. Parsing it correctly client-side isn't the end of the world, but it's the little things that make all the difference. I get more excited for VS2011 with the 4. Keep up the good work sir! This is beyond fantastic news. I've been on a couple of projects recently where we were using vanilla MVC as an API endpoint, and the first thing I did was write a model binder to use JSON. NET for all of our serialization needs because of the way it handles dates and enumerations. So nice to see the wheel not be reinvented. ToShortDateString ; }} This will display normal in view when passed with knockout and you won't have any problems passing it to controller on POST. I was just about to start solving this problem for my own project. But now I know the direction of WebApi I will follow that and use the approach of Henrik Nielsen and mark my code immediately as obsolete as soon as the next version of WebApi will arive ;- Thank for sharing this just in time! Scott I know, i'm looking forward to JSON. NET as the default JSON Serializer in Web API too, i just wanted to share my solution when you don't need globalization support wire format to be culture-neutral. It's not perfect but it works. Regards, always a pleasure to read your blog. I completely agree with the adoption of ISO as a stringified date standard. In the end I came to the realisation that having something that can be read and understood by human eyes has real merit and so now I'm sticking with that. Please what ever you do, don't base it off Microsoft's broken format for IS8601. This is how dates should be formatted from DateTime and DateTimeOffset. NET framework that don't really reflect reality. But the industry as a whole, as pretty much settled on millisecond resolution for the DateTime format, mostly because this is the resolution of UNIX time. It would be great if Microsoft also supported this. I suffered from that nightmare, and decided finally to serialize in ISO 8601 as u did Glad to do like U :. Now if you tell me it's gonna be supported in future releases IT'LL BE GREAT! The worst part is that most developers think that because its in the BCL that DateTime is perfect. It completely ignores the offset when deserializing, among other things. Net being used for webapi instead. Question - is System. Json a different serializer than DCJS in System. Serialization If not, why the new namespace? Hi, Great post, we actually bumped into similar issues not so long ago. For example, if instead of taking a custom class instance as a parameter, my method takes two strings: Post string value1, string value2... Line 1, position 12. CreateObject JsonReader Any ideas? Maybe I don't totally get what the issue on the client is, but if KO cant' handle a json date, that's a KO problem isn't it? That is, the templates aren't designed to handle dates. So if you wanted something that was formatted in a template, then you should pass a string in the first place, I would think. I've never used that before so I am not sure why it would be this way, but I've never had any problems with JS dates on the client. I pass a date from code, it gets serialized into a wierd number, and JSON. More annoying is getting back what you started with on the server, here's my solution to that problem. I'm sure it could be shorter. Changing the way dates are serialized sounds like a recipe for disaster, though, I mean it's not really valid JSON any more. ToDouble ticks ; return DateTime. ToLocalTime ; } I take back part of my previous comment... And ultimately why worry about parsing dates at the client if all you were going to do was turn it into a string? C is much better for formatting strings than javascript! Json classes which are woefully incomplete and will compete with Json. Instead we'll have yet another DLL in the assembly soup that WebAPI adds to a project can we get that consolidated please before RTM please??? Json which will add more confusion yet over what the right way to do low level JSON manipulation. Two steps forward, one step back... The first thing I was going to do with the Web API is make it play with JSON. NET now I don't have to : Web API using JSON. NET by default is awesome news thank you. Rob I also needed more control over JSON formatting, before I knew about Web API I created a JsonValueProviderFactory using JSON. If you use my JsonValueProviderFactory and create a ActionResult that returns JsonConvert. SerializeObject myModel ; you will have completely swapped out the JavaScriptSerializer from MVC. Entity Framework returns DateTimes back as DateTimeKind. I save all of my DateTimes to the DB in UTC, but if the JSON serializer sees DateTimeKind. Unspecified, it figures it is local time and again, converts to UTC for a JSON Date xxxxx response. The result is double hour shifting! I wrote a T4 template that forces all retrieved DateTime objects from the DB to come back as DateTimeKind. UTC by default, but a simple config file flag to force EF to return them UTC, built in, would be A-W-E-S-O-M-E. There is nothing wrong with duck typing, but 'suck' typing portmanteau of string and duck is just asking for trouble. How do you fix it?

Really, the time zone of the server should be considered irrelevant. Consider the following object models and controller. While converting Order object to JSON format the default serializer of ASP. This can be a simple aspnet mvc json date utc like do a query and return data for the last 30 days, or run a query where the user provides local dates for start and end dates. NET serializer was introduced, not many elements used this serializer, so I am really goint to ignore it. What does this parameter do and is needed. This means, even if we could get by our legal department they look really hard at the license agreement that we can NEVER use the new format, as it won't file with the systems that still require the old, unless they update DataContractJsonSerializer with support for more dates. My case might be special in that I don't want timezoned times: everything that is entered or read, is absolute time - it can't vary depending on where the met is.