What's wrong with the logging decorator?

Question

Python

Hello!
Please help me to make the correct decorator for logging the start and stop time of the function, my attempt worked on a simple function, but did not work on a complex one:

def time_logging_decorator(func):
    def log_time(*args, **kwargs):
        start_time = time.time()
        log.info('Function "{}" started at {}'.format(
            func.__name__,
            datetime.datetime.fromtimestamp(start_time).
                                strftime('%Y-%m-%d %H:%M:%S')
        ))
        func(*args, **kwargs)
        log.info("\t\t{} finished in {:.2f} seconds".format(
            func.__name__,
            time.time() - start_time))
    return log_time