#!/usr/bin/env python
# coding: utf-8

# In[1]:


import datetime


# In[2]:


today = datetime.date.today()
today


# In[3]:


now = datetime.datetime.now()
now


# In[4]:


sorted([now, today])


# In[5]:


def dates_before_datetimes(dt):
    if isinstance(dt, datetime.datetime):
        return (dt.date(), dt)  # return a length-2 tuple with date as the first item, datetime as the second        
    elif isinstance(dt, datetime.date):
        return (dt,)  # return a length-1 tuple with date object
        


# In[7]:


dates_before_datetimes(today)


# In[8]:


dates_before_datetimes(now)


# In[6]:


sorted([now, today], key=dates_before_datetimes)