JavaScript time localization for .NET MVC

app.localize.js

// In JS:
// Base namespace
var app = app || {};

$.extend(true, app, {
    localize: {
        /**
         * Local time; see http://blog.gauffin.org/2012/11/displaying-datetime-using-the-user-timezone-in-asp-net-mvc/
         */
        init: function () {
            $('[data-date]').each(function () {
                // the date construct will automatically convert to local time
                var localDate = new Date(parseInt($(this).data('date')));

                if (localDate > 0) {
                    $(this).val(localDate.toLocaleDateString() + " " + localDate.toLocaleTimeString());
                    $(this).text(localDate.toLocaleDateString() + " " + localDate.toLocaleTimeString());
                }
            });
        },
        /**
         * Returns the actual time in Greenwich, England when it was considered "today" (as in 0:00 AM)
         * but in the user's time zone
         */
        today: function (local) {
            var d1 = new Date();
            console.log(d1);
            var y = d1.getFullYear();
            var m = d1.getMonth();
            var d = d1.getDate();

            if (local) {
                return new Date(y, m, d, 0, 0, 0, 0);
            } else {
                return new Date(Date.UTC(y, m, d, 0, 0, 0, 0));
            }
        }
    }
});

$(function () {
    app.localize.init();
});

// In static extensions class (C#)
    public static class UnixTimeExtension
    {
        public static double GetMillisecondsSinceEpoch(this DateTime dateTime)
        {
            // Get the value in Unix time
            var ms = dateTime.Subtract(new DateTime(1970, 1, 1)).TotalMilliseconds;
            return ms;
        }
    }

// In Views/Shared/EditorTemplates/DateTime.cshtml
@using System.Globalization
@using GlassGo.Helpers
@model DateTime?
    
@{
    // http://blog.gauffin.org/2012/11/displaying-datetime-using-the-user-timezone-in-asp-net-mvc/
    var ms = 0D;
    string dateString = null;

    if (Model != null)
    {
        // Get the value in Unix time
        ms = Model.Value.GetMillisecondsSinceEpoch();
        dateString = Model.Value.ToString(CultureInfo.InvariantCulture);
    }
}

<input type="text" id="@ViewData["id"]" name="@ViewData["id"]" data-date="@ms" value="@dateString" />
  
  
// In Views/Shared/DisplayTemplates/DateTime.cshtml
@using System.Globalization
@using GlassGo.Helpers
@model DateTime?
    
@{
    // http://blog.gauffin.org/2012/11/displaying-datetime-using-the-user-timezone-in-asp-net-mvc/
    var ms = 0D;
    string dateString = null;

    if (Model != null)
    {
        // Get the value in Unix time
        ms = Model.Value.GetMillisecondsSinceEpoch();
        dateString = Model.Value.ToString(CultureInfo.InvariantCulture);
    }
}
<span data-date="@ms">@dateString</span>


// Example usage from a razor view:
            <ul class="list-inline">
                <li>From:</li>
                <li>@Html.EditorFor(m => m.FromDateTime, new { id = "deFrom" })</li>
                <li>to</li>
                <li>@Html.EditorFor(m => m.ToDateTime, new { id = "deTo" })</li>
            </ul>