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    <p>While @amakhrov answer will work (and would be even better if used writeable computed observable like sujested by @Stijn) I decided to do this using <a href="http://knockoutjs.com/documentation/custom-bindings.html">Custom Bindings</a>.</p> <p>The main advantage of doing this is reusability - I just have to use <code>data-bind="datePicker : MyDate"</code> whereever I want to tie this in. I can also modify other properties of the input element so this could be really useful if binding to complex jQuery (and other) controls.</p> <p><em>(<a href="http://www.knockmeout.net/2011/03/reacting-to-changes-in-knockoutjs.html">Read here for more pro/cons</a> about the 3 choices to do this sort of thing)</em></p> <p>HTML</p> <pre><code>&lt;input data-bind="datePicker : MyDate" type="date"&gt; </code></pre> <p>JS</p> <pre><code>ko.bindingHandlers.datePicker = { init: function (element, valueAccessor, allBindingsAccessor, viewModel) { // Register change callbacks to update the model // if the control changes. ko.utils.registerEventHandler(element, "change", function () { var value = valueAccessor(); value(new Date(element.value)); }); }, // Update the control whenever the view model changes update: function (element, valueAccessor, allBindingsAccessor, viewModel) { var value = valueAccessor(); element.value = value().toISOString(); } }; var viewModel = { MyDate : ko.observable(new Date()) }; ko.applyBindings(viewModel); </code></pre> <p>See <a href="http://jsfiddle.net/LLkC4/5/">http://jsfiddle.net/LLkC4/5/</a></p>
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    1. COIs this still working for you? My chrome datepicker refuses to show any date - just "mm/dd/yyyy" in the box even as I pick new dates and even as they show up in your log printout. Do you know how to fix it? I'm struggling.
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      1. USJason Kleban
    2. CO@uosɐſ This wasn't working for me either until I started calling `ko.unwrap(valueAccessor())` in the update function.
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