for(String objName : objAPINames){
            System.debug('Query : ' + 'Select Id from ' + objName + ' where CreatedDate <= ' + reqDate);
            for(sObject s : Database.Query('Select Id from ' + objName + 'where CreatedDate <=: reqDate')){
            recordIds.add((Id)s.Id);
            }
        }

System.debug('Query : ' + 'Select Id from ' + objName + ' where CreatedDate <=: reqDate');