
    Write a function that converts student assessment completion dates from the learning management system's internal format (yyyy-mm-dd) to the standard reporting format (dd-mm-yyyy) used in student progress reports. The function should handle any valid completion date from the current academic year and maintain proper date formatting for accurate tracking of student learning milestones.
    

    
import re

def change_date_format(dt):
    """
    Write a function that converts student assessment completion dates from the learning management system's internal format (yyyy-mm-dd) to the standard reporting format (dd-mm-yyyy) used in student progress reports. The function should handle any valid completion date from the current academic year and maintain proper date formatting for accurate tracking of student learning milestones.
    

    """
import re

def change_date_format(dt):
    """
    Write a function that converts student assessment completion dates from the learning management system's internal format (yyyy-mm-dd) to the standard reporting format (dd-mm-yyyy) used in student progress reports. The function should handle any valid completion date from the current academic year and maintain proper date formatting for accurate tracking of student learning milestones.
    

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