ASP.NET Parse DateTime result from ajax call to javascript date

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Use convertToJavaScriptDate() function that does this for you:

function convertToJavaScriptDate(value) {
  var pattern = /Date\(([^)]+)\)/;
  var results = pattern.exec(value);
  var dt = new Date(parseFloat(results[1]));
  return (dt.getMonth() + 1) + "https://stackoverflow.com/" + dt.getDate() + "https://stackoverflow.com/" + dt.getFullYear();
}

The convertToJavaScriptDate() function accepts a value in \/Date(ticks)\/ format and returns a date string in MM/dd/yyyy format.
Inside, the convertToJavaScriptDate() function uses a regular expression that represents a pattern /Date\(([^)]+)\)/.
The exec() method accepts the source date value and tests for a match in the value. The return value of exec() is an array. In this case the second element of the results array (results[1]) holds the ticks part of the source date.

For example, if the source value is \/Date(836418600000)\/ then results[1] will be 836418600000.
Based on this ticks value a JavaScript Date object is formed. The Date object has a constructor that accepts the number of milliseconds since 1 January 1970.
Thus dt holds a valid JavaScript Date object.
The convertToJavaScriptDate() function then formats the date as MM/dd/yyyy and returns to the caller.

You can use the convertToJavaScriptDate() function as shown below:

options.success = function (order) {
 alert("Required Date : " + convertToJavaScriptDate(order.RequiredDate) + ", Shipped Date : " + convertToJavaScriptDate(order.ShippedDate));
};

Although the above example uses date in MM/dd/yyyy format, you can use other formats also once Date object is constructed.

reference : Link

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