import datetimedef getdate(date):    s_date = datetime.date(1899, 12, 31).toordinal() - 1    if isinstance(date, float):        date = int(date)    d = datetime.date.fromordinal(s_date + date)    return d.strftime("%Y-%m-%d")print getdate(41400.0)

输出：2013-05-06