getReturns param returnCreationStartDate gives Object of class DateTime could not be converted to string

[Vickyvignesh-01]

The getReturns() param returnCreationStartDate, returnCreationEndDate expects DateTime, if i give the datetime type like
2024-12-01T00:00:01Z (converted into Datetime type) it gives error as Object of class DateTime could not be converted to string below is the code
$returnCreationStartDateString = new \DateTime ('2024-12-10T00:00:01Z');
$returnCreationEndDateString = new \DateTime ('2024-12-10T23:00:01Z');

    $returnOrderId = null; 
    $customerOrderId = null; 
    $status = null; 
    $replacementInfo = null; 
    $returnType = null; 
    $returnCreationStartDate = $returnCreationStartDateString;
    $returnCreationEndDate = $returnCreationEndDateString;
    $returnLastModifiedStartDate = null; 
    $returnLastModifiedEndDate = null; 
    $limit = '200';

    $result = $returnsApi->getReturns($returnOrderId, $customerOrderId, $status, $replacementInfo, $returnType, $returnCreationStartDate, $returnCreationEndDate, $returnLastModifiedStartDate, $returnLastModifiedEndDate, $limit);
    
    how could i resolve this? @jlevers