jonathascosta

    public static class TypeExtensions 
    {
        public static Type GetValueTypeIfNullable(this Type type)
        {
            return type.IsNullable() ? type.GetGenericArguments()[0] : type;
        }

        public static bool IsNullable(this Type type)
        {
            return (type.IsGenericType && typeof(Nullable<>) == type.GetGenericTypeDefinition());

jonathascosta

Date.prototype.clone = function () {
    return new Date(this.valueOf());
}

Date.prototype.addDays = function (days) {
    var d = this.clone();
    d.setDate(d.getDate() + days);
    return d;
}