private static bool IsAvailibleForDisplaying(IComment comment)
        {
            var timeToLive = TimeSpan.FromMinutes(SiteSettings.Instance.CommentsRulesSection.TimeToLive.Minutes);

            if (DateTime.Now > comment.Created + timeToLive)
                return false;

            var rules = SiteSettings.Instance.CommentsRulesSection.ScheduleRules.OfType<ScheduleRule>();

            Func<ScheduleRule, bool> isRuleActive =
                (ScheduleRule rule) => comment.Created > rule.StartTime &&
                                       comment.Created < rule.EndTime &&
                                       rule.WeekDays.Contains(DateTime.Now.DayOfWeek.ToString());

            var activeRules = rules.Where(rule => isRuleActive(rule))
                                   .Select(rule => rule.RuleType);

            if (activeRules.Any(rule => rule == "Pre"))
                return false;

            if (activeRules.All(rule => rule != "Post"))
                return false;

            return true;
        }