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Vibe codingMediumvc-g033
Subject Ai code reviewLevel Mid–Senior~16 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An AI assistant generated this Python to compute how many whole days until a subscription renews, given a UTC renewal timestamp string:

python
from datetime import datetime def days_until_renewal(renewal_iso: str) -> int:    renewal = datetime.fromisoformat(renewal_iso)    now = datetime.now()    delta = renewal - now    return delta.days

It returns sensible numbers in your local dev environment. List the bugs and the inputs that expose them.

What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

Learn the concepts
Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.