如何计算Y/M/D h:m:s.ns格式的两个日期之间的差额

from datetime import datetime

def calculate_time_difference(start_date, end_date):
    date_format = "%Y/%m/%d %H:%M:%S.%f"
    start_datetime = datetime.strptime(start_date, date_format)
    end_datetime = datetime.strptime(end_date, date_format)
    time_difference = end_datetime - start_datetime
    return time_difference

start_date = "2022/01/01 12:00:00.000000"
end_date = "2022/01/02 12:30:30.500000"

difference = calculate_time_difference(start_date, end_date)
print("Time difference:", difference)