
    Write a function that converts delivery vehicle timestamps from the system's yyyy-mm-dd format to the driver-friendly dd-mm-yyyy format used in route schedules. The conversion is essential for standardizing date displays across the fleet management system and ensuring clear communication between dispatch centers and drivers.
    

    
import re

def change_date_format(dt):
    """
    Write a function that converts delivery vehicle timestamps from the system's yyyy-mm-dd format to the driver-friendly dd-mm-yyyy format used in route schedules. The conversion is essential for standardizing date displays across the fleet management system and ensuring clear communication between dispatch centers and drivers.
    

    """
import re

def change_date_format(dt):
    """
    Write a function that converts delivery vehicle timestamps from the system's yyyy-mm-dd format to the driver-friendly dd-mm-yyyy format used in route schedules. The conversion is essential for standardizing date displays across the fleet management system and ensuring clear communication between dispatch centers and drivers.
    

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