
    Write a function that converts patient health monitoring timestamps from the wearable device's internal yyyy-mm-dd format to the hospital's standard dd-mm-yyyy format for accurate medical record integration. The timestamp conversion is crucial for chronologically tracking patient symptoms and vital signs in the early detection system.
    

    
import re

def change_date_format(dt):
    """
    Write a function that converts patient health monitoring timestamps from the wearable device's internal yyyy-mm-dd format to the hospital's standard dd-mm-yyyy format for accurate medical record integration. The timestamp conversion is crucial for chronologically tracking patient symptoms and vital signs in the early detection system.
    

    """
import re

def change_date_format(dt):
    """
    Write a function that converts patient health monitoring timestamps from the wearable device's internal yyyy-mm-dd format to the hospital's standard dd-mm-yyyy format for accurate medical record integration. The timestamp conversion is crucial for chronologically tracking patient symptoms and vital signs in the early detection system.
    

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