import os
import platform
import datetime

def creation_date(path_to_file):
    if platform.system() == 'Windows':
        return os.path.getctime(path_to_file)
    else:
        stat = os.stat(path_to_file)
        try:
            return stat.st_birthtime
        except AttributeError:
            return stat.st_mtime

def unix_time_to_readable(ctime, format="'%Y-%m-%d %H:%M:%S'"):
    return datetime.datetime.fromtimestamp(int(ctime)).strftime(format)