Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Dates and Times in Python Let's Build a Timed Quiz App Simple Time Machine


anyone to point where am getting it wrong

import datetime

starter = datetime.datetime(2015, 10, 21, 16, 29)

def delorean(integer):
  #starter.hour must be the difference of the first starter.hour and integer
  #there is no negative time there for integer must be greater than starter.hour and less than or ==23
  if integer > starter.hour:
    return starter.replace(hour = integer - starter.hour)
  elif integer < starter.hour:
    return starter.replace(hour = starter.hour - integer)
    return starter

1 Answer

Kenneth Love
Kenneth Love
Treehouse Guest Teacher

So what if your starter hour is 22 (10 pm), and integer comes in as 5. Your code turns the hour into 27, which...well, doesn't exist. Since you're wanting to move backwards and forwards through time, you need to use timedelta() and not just replace hours or other units.