Batch Apex error 'Aggregate query does not support queryMore'

global class MySchedulableClass implements Schedulable{ 
@ReadOnly 
global void execute (SchedulableContext ctx){ 
List<AggregateResult> query = [Select MIN(CreatedDate) CD from Account]; 
DateTime dt; 
for(AggregateResult ar : query){ 
dt = (DateTime)ar.get('CD'); 
} 
RunQuery rq = new RunQuery(dt); 
Database.executeBatch(rq); 
} 
}

global class RunQuery implements Database.Batchable<sObject> { 
global DateTime dt; 
global RunQuery(DateTime dt){ 
this.dt = dt; 
} 
global Database.QueryLocator start(Database.BatchableContext BC){ 
System.debug('const' + dt); 
Set<DateTime> dtime = new Set<DateTime>(); 
dtime.add(dt); 

DateTime createdDate; 
String query; 
query = 'select Id from Account where CreatedDate =: dt'; 
return Database.getQueryLocator(query); 
} 

global void execute(Database.BatchableContext BC, List<sObject> scope){ 
for(sObject s : scope){ 
System.debug('----------' + s); 
} 
} 
global void finish(Database.BatchableContext BC){ 
AsyncApexJob a = 
[Select Id, Status, NumberOfErrors, JobItemsProcessed,TotalJobItems,CreatedBy.Email FROM AsyncApexJob WHERE Id = :BC.getJobId()]; 
System.debug('********: ' + a.Id); 
} 
}

global class AggregateResultIterable implements Iterable<AggregateResult>{ 
global Iterator<AggregateResult> Iterator(){ 
return new AggregateResultIterator(); 
} 
}

global class AggregateResultIterator Implements Iterator<AggregateResult>{ 

AggregateResult [] results {get;set;} 
Integer index {get;set;} 

global AggregateResultIterator(){ 
String query = 'select Id, MIN(createdDate) from Account GROUP BY Id LIMIT 1'; 
results = Database.query(query); 
} 

global boolean hasNext(){ 
return results !=null && !results.isEmpty() && index < results.size(); 
} 

global AggregateResult next(){ 
return results[index++]; 
} 
}

global class RunQuery implements Database.Batchable<AggregateResult> { 

global Iterable<AggregateResult> start(Database.BatchableContext BC){ 
return new AggregateResultIterable(); 
} 

global void execute(Database.BatchableContext BC, List<sObject> scope){ 
for(sObject s : scope){ 
System.debug('----------' + s); 
} 
} 

global void finish(Database.BatchableContext BC){ 
AsyncApexJob a = 
[Select Id, Status, NumberOfErrors, JobItemsProcessed,TotalJobItems,CreatedBy.Email FROM AsyncApexJob WHERE Id = :BC.getJobId()]; 
System.debug('********: ' + a.Id); 
} 
}