
    Write a function to convert user interaction timestamps from the backend's yyyy-mm-dd format to the platform's standard display format of dd-mm-yyyy, ensuring consistent date presentation across the social network's content feed. The function should maintain the chronological integrity of user activities while making dates more readable for the platform's global user base.
    

    
import re

def change_date_format(dt):
    """
    Write a function to convert user interaction timestamps from the backend's yyyy-mm-dd format to the platform's standard display format of dd-mm-yyyy, ensuring consistent date presentation across the social network's content feed. The function should maintain the chronological integrity of user activities while making dates more readable for the platform's global user base.
    

    """
import re

def change_date_format(dt):
    """
    Write a function to convert user interaction timestamps from the backend's yyyy-mm-dd format to the platform's standard display format of dd-mm-yyyy, ensuring consistent date presentation across the social network's content feed. The function should maintain the chronological integrity of user activities while making dates more readable for the platform's global user base.
    

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