[Vuejs]-How can I do a two way data biding using date picker?

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You have to convert the C# DateTime-object to JavaScript Date-object. In JS you can create a Date object by passing in the number of milliseconds since 1 January 1970 (new Date(0) will give you 1970-01-01). For getting this number you can use an extension like: 

 public static class DateTimeExtensions
 {
    private static readonly long DatetimeMinTimeTicks =
        (new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).Ticks;

    public static long ToJavaScriptMilliseconds(this DateTime dt)
    {
        return (long)((dt.ToUniversalTime().Ticks - DatetimeMinTimeTicks) / 10000);
    }
  }

So now you can in the backend do for instance:

long numberOfMilliseconds = DateTime.Now.ToJavaScriptMilliseconds(); //C#

And send that to the frontend so you can do this with JavaScript:

var myDate = new Date(editedItem.numberOfMilliseconds); //JavaScript

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