[Tutor] checking connection to internet until success

[Pi]

Hi Tutor,

with this code i am getting actual date from internet. I need correct 
date, because i am not sure this set on computer is right.


import requests, time

try:
     OnLineDate = requests.get("http://just-the-time.appspot.com").text[:10]
     OffLineDate = time.strftime("%Y-%m-%d")

     if OnLineDate == OffLineDate:

         do_something

     else:

         do_something_else


except requests.ConnectionError:
     print("Can not connect.")


But this code is run once. And i am stuck. Tries with while loop doesnt 
took any advance. I was thinking about something like after method used 
in tkinter, but still i cant figure out how do this. Can You guide me, 
how check connection to internet to check for every lets say 30 seconds 
until success?


Best regards