Some potentially useful handlebars helpers.

handlebars_helpers.js

        Handlebars.registerHelper('json', function(obj) {
            return JSON.stringify(obj);
        });

        Handlebars.registerHelper('fixed', function(obj) {
            return obj.toFixed(2);
        });

        Handlebars.registerHelper('encode', function(obj) {
            return encodeURIComponent(obj);
        });

        Handlebars.registerHelper("shortDate", function (datetime) {
            if (!datetime)
                return datetime;

            // the default MVC JSON serializer does not format dates correctly: http://www.devcurry.com/2013/04/json-dates-are-different-in-aspnet-mvc.html#.Uk2xG4bXa_l
            var parsedValue = new Date(parseInt(datetime.replace(/\/Date\((.*?)\)\//gi, "$1")));
            return (parsedValue.getMonth() + 1) + '/' + ("00" + parsedValue.getDate()).substr(-2) + '/' + parsedValue.getFullYear();
        });

        Handlebars.registerHelper('phoneNumber', function(obj) {
            if (!obj)
                return obj;

            var digits = obj.replace(/[^\d.]/g, "");
            if (!digits || (digits.length != 10 && digits.length != 11))
                return obj;

            if (digits.length == 11)
                digits = digits.substring(1, 11);

            return '(' + digits.substring(0, 3) + ') ' + digits.substring(3, 6) + '-' + digits.substring(6);
        });