
    Write a function to convert loan application submission dates from the bank's database format (yyyy-mm-dd) to the standardized credit assessment report format (dd-mm-yyyy) for proper documentation and compliance requirements. The function must handle all valid dates within the bank's application processing timeline and maintain data integrity during the conversion process.
    

    
import re

def change_date_format(dt):
    """
    Write a function to convert loan application submission dates from the bank's database format (yyyy-mm-dd) to the standardized credit assessment report format (dd-mm-yyyy) for proper documentation and compliance requirements. The function must handle all valid dates within the bank's application processing timeline and maintain data integrity during the conversion process.
    

    """
import re

def change_date_format(dt):
    """
    Write a function to convert loan application submission dates from the bank's database format (yyyy-mm-dd) to the standardized credit assessment report format (dd-mm-yyyy) for proper documentation and compliance requirements. The function must handle all valid dates within the bank's application processing timeline and maintain data integrity during the conversion process.
    

    """
    return re.sub('(\\d{4})-(\\d{1,2})-(\\d{1,2})', '\\3-\\2-\\1', dt)