function next thisSchemaDate Date UTC 2014 11 20 if schemaDate thisSch

function(next) {
            thisSchemaDate = Date.UTC(2014, 11, 20);
            if (schemaDate < thisSchemaDate) {
                winston.info('[2014/12/20] Updating digest settings');

                async.waterfall([
                    async.apply(db.getSortedSetRange, 'users:joindate', 0, -1),
                    async.apply(User.getMultipleUserSettings)
                ], function(err, userSettings) {
                    if (err) {
                        winston.error('[2014/12/20] Error encountered while updating digest settings');
                        return next(err);
                    }

                    var now = Date.now();

                    async.eachLimit(userSettings, 50, function(setting, next) {
                        if (setting.dailyDigestFreq !== 'off') {
                            db.sortedSetAdd('digest:' + setting.dailyDigestFreq + ':uids', now, setting.uid, next);
                        } else {
                            next(false);
                        }
                    }, function(err) {
                        if (err) {
                            winston.error('[2014/12/20] Error encountered while updating digest settings');
                            return next(err);
                        }
                        winston.info('[2014/12/20] Updating digest settings done');
                        Upgrade.update(thisSchemaDate, next);
                    });
                });
            } else {
                winston.info('[2014/12/20] Updating digest settings skipped');
                next();
            }
        }